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Writing with artificial intelligence.

  • © 2023 by Joseph M. Moxley - Professor of English - USF

Simplicity is a judgment made by people (e.g., readers & users) about whether a text or design of a product or app is as simpl e as possible given the complexity of the topic and rhetorical situation .  Simplicity is a highly prized attribute of communication . Learn how to identify the absence and presence of simplicity in your writing and the texts of others. Use simplicity (along with brevity , flow  and unity ) to create a professional writing style .

simplicity in writing: waterfall flowing into sea

Simplicity is

  • a textual attribute, an element of style, that describes a style of writing that is as straightforward and uncomplicated as possible given the complexity of the topic , the writer’s aims, and the complexities of the rhetorical situation .
  • the art of minimizing unnecessary complexities in both language and structure to ensure that the intended message is transmitted clearly and efficiently
  • a design philosophy grounded in usability studies and customer discovery .

Simplicity in style doesn’t necessarily mean simplicity in content . Simplicity does not imply a diminution of complexity or richness in thought. Invariably, some writing projects are incredibly complex and decipherable only by other experts. Thus, texts that users describe as “simple” can be incredibly complex! What sets these sorts of highly prized texts from texts that lack this textual attribute is that they are not needlessly complex.

Related Concepts: Clarity ; Design Thinking ; Styles of Writing ; Customer Discovery ; Persona ; Tone ; Voice .

Why Does Simplicity Matter?

When texts are needlessly obtuse, readers/users will click elsewhere.

Perhaps because we are bombarded with information on a daily basis, we tend to have little patience with superfluous language, including vague language, disorganized prose, on unsupported claims and underdeveloped content.

Readers/Users have a million other things they could be do than reading your text.

How Can I Achieve Simplicity in My Writing?

First, you might find it useful to look at simplicity as happening on two levels:

  • The Global Perspective
  • The Local Perspective

Simplicity from a Global Perspective

As readers or users, we hate it when writers go off on tangents and introduce unrelated information/data or employ inappropriate rhetorical appeals .

To achieve simplicity at the global level , you need to maintain a tight focus on your purpose and audience .

  • You need a robust understanding of the topic and audience to differentiate given information (what the audience already knows) from new information . Identify the media, genres, and channels of communication your audiences use for communications.
  • Visual language is a powerful tool of simplicity. What photographs, illustrations, and videos can be added to your text to exemplify or illustrate something? Rather than a traditional alphabetical text, should you compose an infographic?
  • Organize information around a thesis , research question , and conventional organizational schema.

Simplicity from a Local Perspective

Simplicity involves choosing words and phrases that are simple and precise. It eschews jargon, overly complex language, and convoluted sentence structures, all of which can obfuscate meaning and impede understanding.

Unless the text is intended to be a work of literature/art, most audiences just want the bottom line. For many people this translates into succinct prose , a professional/technical writing style , and introductory paragraphs written in a deductive style that identifies the thesis / purpose for writing. These sorts of semantic and stylistic attributes, packaged in common academic and business genres, constitutes what is collectively called a professional writing prose style .

Simplicity @ Paragraph Level

Simplicity at the paragraph level is often associated with clarity flow, coherence, and unity.

Simplicity @ Sentence Level

At the sentence level, simplicity is tied to

  • absence of diction/word level errors
  • absence of grammatical and mechanical errors
  • syntax and mechanics, including sentence patterns , sentence structures .

Recommended Readings

  • Graham, Paul (3/2021). Write Simply .
  • William Zinsser. Simplicity , from On Writing Well .

Strunk, W., In White, E. B., White, E. B., & White, E. B. (2009). The elements of style.

Brevity - Say More with Less

Brevity - Say More with Less

Clarity (in Speech and Writing)

Clarity (in Speech and Writing)

Coherence - How to Achieve Coherence in Writing

Coherence - How to Achieve Coherence in Writing

Diction

Flow - How to Create Flow in Writing

Inclusivity - Inclusive Language

Inclusivity - Inclusive Language

Simplicity

The Elements of Style - The DNA of Powerful Writing

Unity

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Citation Guide – Learn How to Cite Sources in Academic and Professional Writing

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Make Your Note

Simplicity is the Ultimate Sophistication

  • 20 Oct 2023

"Nature is pleased with simplicity. And nature is no dummy."   

- Isaac Newton

In a world characterized by rapid technological advancements , intricate complexities , and an ever-growing array of options , the concept of simplicity stands out as a timeless beacon of elegance and wisdom . "Simplicity is the ultimate sophistication," encapsulates a profound truth that transcends time and resonates with the essence of human nature . This essay explores the multifaceted significance of simplicity, delving into its manifestations across various aspects of life and its enduring impact on individuals, societies, and even creativity.  

At first glance, simplicity may appear as a mere absence of complexity, a surface-level reduction of elements. However, true simplicity is an art form that involves distilling the essence of an idea, object, or concept to its purest and most fundamental form. This stripping away of unnecessary embellishments reveals a sense of elegance that is deeply appealing and enduring .   

Ironically, embracing simplicity often requires an appreciation for complexity . The capacity to distinguish the crucial elements amidst a complex array showcases a depth of comprehension that stands as a defining trait of sophistication. Take, for instance, the art of storytelling . A well-crafted narrative weaves together a tapestry of characters, plotlines, and emotions, yet the true mastery lies in conveying this complexity to the audience in a coherent and simple manner .   

Simplicity extends beyond aesthetics and intellectual pursuits ; it is deeply intertwined with human character and values. In an era where material possessions and societal status often define success, a person who embraces simplicity stands out as a beacon of authenticity and self-awareness . Mahatma Gandhi's minimalist lifestyle , driven by his commitment to truth and non-materialism , exemplifies how simplicity can become a powerful statement of one's principles. It reflects a conscious choice to rise above the superficial and prioritize what truly matters be it personal relationships, ethical values, or the pursuit of knowledge.  

In an age of environmental challenges , simplicity takes on a new dimension as a sustainable way of life. The consumerist culture of excess has led to overconsumption , depletion of resources , and environmental degradation . Embracing simplicity in our consumption patterns, choosing quality over quantity, favoring durable goods over disposables  contributes not only to personal well-being but also to the larger goal of preserving the planet for future generations. The concept of minimalism , which encourages mindful consumption and reduction of waste , aligns seamlessly with the principles of sustainability.  

Simplicity can serve as a catalyst for boundless creativity. When the mind is unburdened by unnecessary complexities, it gains the freedom to explore, innovate, and create .   

Effective communication is often rooted in simplicity . Whether conveying complex scientific concepts to a broad audience or crafting a persuasive argument, the ability to distill information into clear and concise messages is a skill of profound sophistication . Think of the eloquence of Martin Luther King Jr.'s " I Have a Dream" speech; its power lies in its simplicity , enabling it to resonate across generations and inspire social change.   

Cultivating simplicity requires a conscious and deliberate effort, particularly in a world that bombards us with distractions and excesses . Mindfulness practices , such as meditation and minimalism, offer pathways to embracing simplicity in our lives. By decluttering our physical spaces, streamlining our routines , and nurturing meaningful connections , we can create an environment conducive to clarity of thought and a deeper appreciation for the beauty in simplicity.  

In this complex world, the idea that "Simplicity is the ultimate sophistication" stands out as a timeless and universal principle. It means that keeping things simple is really smart , even though it might seem basic. When we understand and embrace simplicity, it brings a lot of good things. It makes things more beautiful and easier to understand. It also helps us be better people, take better care of the Earth , and be more creative . This simple approach to life has a big and positive impact .  

Remember, simple doesn't mean going back in time . It's not about being old-fashioned . Instead, it's a path to the true heart of being smart and sophisticated. In various contexts, "simplicity" can mean different things. Simplicity refers to a minimalist and uncluttered approach . It involves using only essential elements to achieve a functional and aesthetically pleasing result. The "less is more" principle is often associated with simplicity.  

Embracing simplicity as a lifestyle involves focusing on what truly matters , reducing clutter, and minimizing material possessions . It often emphasizes experiences, relationships, and personal well-being over excessive consumption. Simplicity can be user-friendly interfaces , intuitive designs , and streamlined processes that make it easy for users to interact with devices or software as per technology is concerned.  

Philosophical simplicity involves seeking fundamental truths and principles without unnecessary complications. It can be seen as a pursuit of clarity and understanding through basic concepts. Nature often exemplifies simplicity through its efficient and elegant solutions to complex challenges . Natural systems often operate with remarkable simplicity and effectiveness.  

Sophistication refers to the quality or state of being sophisticated . It generally describes a level of refinement , complexity , or elegance in a person , object, process, or idea. When something is sophisticated, it often implies that it has been developed, designed, or executed with a high degree of skill, knowledge, or taste. In various contexts, "sophistication" can mean different things. When referring to a person, sophistication can describe an individual's cultivated and refined manners , tastes, and behaviors. A sophisticated person is often seen as knowledgeable and cultured.   

In technology, a sophisticated system or device is one that is intricate, advanced, and capable of performing complex tasks. It could refer to intricate patterns or details in design .  In finance and economics , sophistication might refer to complex financial instruments or investment strategies that require a deep understanding of markets and economics. Sophistication can also be related to the complexity and depth of language usage, ideas, or arguments. A sophisticated piece of writing , for example, might involve intricate language and well-developed concepts .  

In the context of fashion, sophistication can describe stylish and elegant clothing choices or overall lifestyle choices that reflect refined tastes. In the culinary world, sophistication can refer to dishes or cooking techniques that are intricate, refined , and often involve a blend of flavors and textures.  It's important to note that the concept of sophistication can be subjective and culturally dependent. What is considered sophisticated in one context or culture might differ in another.   

Both simplicity and sophistication have cultural and subjective aspects , with their interpretations varying across contexts and societies. While simplicity seeks to eliminate unnecessary elements, sophistication embraces intricacy and depth, showcasing the diversity of human expression and understanding.  

"Life is really simple, but we insist on making it complicated."  

- Confucius

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Rebi Simple Living

It's time to focus on the simple things in life.

Simplicity in Life: The Value of Simple Living

December 28, 2021

Happiness means different things to different people, but research has shown that simplicity in life is so much more fulfilling than all the material things.  

When simplicity is the goal in life, most of your worries will disappear. You can focus more on what’s really important and be truly happy.

Jump Through Article

What Is Simplicity in Life?

Simplicity in life is a state of mind where simplicity has been achieved. 

Living a simple life does not mean living an impoverished one, though it may seem like that to some at first. It rather means appreciating the little things in life more than the material things.

By little things, I mean more free time, your loved ones, your hobbies, nature, good food, etc. 

Basically, more experiences and less stuff.

When you achieve simplicity in life, you feel calmer in daily situations and simplicity becomes a habit. It shines through every aspect of your life.

Jump to: 10 Ways to Embrace Simplicity

Example of Simplicity in Life

You can apply simplicity to every aspect of your life but for the purpose of exemplifying simplicity let’s take a look at simplicity in nutrition . 

When you eat simple and whole foods you feel lighter and have more energy. Eating simple saves you a lot of time and is also good for your wallet.

Learn how to prepare a number of meals you love to eat and rotate them through the month. 

That way you’ll always know what to cook, you can prepare meals in advance, and you can go in and out of the grocery store exactly knowing what you need to buy.

Simple eating is easy, healthy, and economic. It might sound boring to some, but you can always treat yourself to an exotic meal at a restaurant.

Importance of Simplicity in Life

There are many benefits to simplicity in life. 

One of the most important benefits is that simplicity gives us choices in the way we spend our time, money, and energy. 

With simplicity in life, it can be easier to recognize what is truly important among all the different things fighting for your time and attention.

The biggest benefits of simple living are:

  • Lower cost of living
  • More free time
  • Less stress
  • Sustainable (smaller footprint)
  • Better concentration
  • Better sleep
  • Stronger relationships

There are many more benefits of simple living and they are individual to each person, so it’s better to try living simply and see for yourself. 🙂

10 Ways to Embrace Simplicity

Here are ten easy ways to embrace simplicity in your life. Try them out and simplify your living.

1. Be grateful

Practice being intentional about the things you are grateful for. Start a gratitude journal; nothing special just a small notebook, and write 5 things you are thankful for each day. 

Gratitude has many benefits. It makes you more humble, but also increases your long-term happiness, improves sleep and physical health, among others.

2. Notice the small things

Do you rush through life keeping busy and then wonder where the time has passed? 

Take a moment to stop and breathe. Notice the small things in life that make your experience unique. 

Take a look at the birds, flowers, people passing by, and just soak in all the wonderful little things that life has to offer. 

I’m afraid if you don’t you’ll go through life like a zombie and later regret missed adventures.

3. Spend time alone

Being around people is wonderful, but everyone needs some time for themselves. Set aside time to spend alone each day, even if for only 5 minutes.

Spend this time in silence, relaxing, and doing something you enjoy. It can be drinking tea, reading, doing a self-care routine, or something else.

4. Enjoy movement

It’s pretty simple, physical activity makes you feel good. You don’t have to do anything crazy, a nice, long walk will do the trick.

Find what type of exercise you like to do and stick to it. It will keep you healthy for a long time not only physically but also mentally.

5. Sleep enough

Getting enough sleep is crucial for your health. Adults need an average of 7 hours of good sleep every night in order to feel rested and can be fully productive during the day.

Keep off the screens for at least an hour before bed, create a calming atmosphere in your bedroom, and try not to eat late at night.

6. Say I love you more often

Saying I love you more often creates a sense of security not only among couples but also in parent-child and friend relationships. 

Showing your emotions generates stronger bonds. Deeper connections in your life will make you happier and will simplify your relationships overall.

7. Keep your home clean

When your home is clean you can think more straight and relax more easily in your house. 

Take a couple of minutes every day to tidy your home. Keep the surfaces clear, take the trash out regularly, and neaten your living space.

By keeping your home tidy, you’ll spend much less time deep cleaning and you’ll always know where to find what you need. 

8. Eat at the table

When was the last time you have eaten at the table?

Living a simple life means being intentional about different aspects of life.

Try to eat your meals eat the table. You will be much more present, taste the flavor of the meal, and be aware when you’re full. 

You’ll also have the opportunity to talk with your housemates while sharing a meal, isn’t that wonderful?

9. Be present

Being present means focusing on one thing at a time. Multitasking will only exhaust you and in the end, you won’t even be able to tell what you have done.

When you’re doing something, whether in your work or personal life, be present in the moment. Give your undivided attention to the task at hand or a person you’re talking to. 

You’ll appreciate what you did every day much more.

10. Stop comparing yourself 

Your life is yours to live. Set your own rules and stop comparing yourself to others.

You will feel much better when you focus on your own life and stop noticing what others are doing.

Only then you’ll truly be able to enjoy your daily life and be happy.

definition essay about simplicity

The Beauty of Simplicity

Simplicity lifestyle enables you to slow down and take it easy. 

The importance of simplicity is the beauty of living. Enjoy your life and the little things you enjoy.

Your life doesn’t have to be extraordinary in order for you to experience a wonderful life.

You can enjoy simple things and still have an amazing life but with less stress and worry.

Posted By: Rebecca · In: Simple Living

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simplicity noun

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What does the noun simplicity mean?

There are 13 meanings listed in OED's entry for the noun simplicity , three of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

How common is the noun simplicity ?

How is the noun simplicity pronounced?

British english, u.s. english, where does the noun simplicity come from.

Earliest known use

Middle English

The earliest known use of the noun simplicity is in the Middle English period (1150—1500).

OED's earliest evidence for simplicity is from before 1398, in a translation by John Trevisa, translator.

simplicity is of multiple origins. Partly (i) a borrowing from French. Partly (ii) a borrowing from Latin.

Etymons: French simplicité ; Latin simplicitāt- , simplicitās .

Nearby entries

  • simplex munditiis, adj. & n. 1630–
  • simplex sentence, n. 1960–
  • simplex tableau, n. 1952–
  • simplicial, adj. 1913–
  • simplicial complex, n. 1930–
  • simplician, n. 1590–1673
  • simplicist, n. & adj. 1577–
  • simplicistic, adj. 1920–
  • simplicitarian, n. 1809–
  • simpliciter, adv. ?a1425–
  • simplicity, n. a1398–
  • simplicize, v. 1814–
  • simplification, n. 1646–
  • simplificator, n. 1829–
  • simplificatory, adj. 1905–
  • simplified, adj. 1646–
  • simplified speller, n. a1910–
  • simplified spelling, n. 1864–
  • simplifier, n.¹ 1594
  • simplifier, n.² 1778–
  • simplify, v. 1609–

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Meaning & use

Pronunciation, compounds & derived words, entry history for simplicity, n..

simplicity, n. was revised in September 2019.

simplicity, n. was last modified in June 2024.

oed.com is a living text, updated every three months. Modifications may include:

  • further revisions to definitions, pronunciation, etymology, headwords, variant spellings, quotations, and dates;
  • new senses, phrases, and quotations.

Revisions and additions of this kind were last incorporated into simplicity, n. in June 2024.

Earlier versions of this entry were published in:

OED First Edition (1911)

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OED Second Edition (1989)

  • View simplicity in OED Second Edition

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Citation details

Factsheet for simplicity, n., browse entry.

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227 Words Short Essay on Simplicity

Simplicity is a great virtue which one can observe in life. We are rightly advised by the wise elders to believe in simple living and high thinking. We should observe simplicity in our food habits. We should take simple but nourishing food. If we are children, we should take milk, butter, bread, vegetables, curd, cheese and fruits.

We should avoid fast foods. If we are grown ups, we should take less fat and salt, but we should take vegetables and fruits in abundance. In all cases fast food, fried items, soft drink and alcoholic drinks should be avoided. We should not smoke at any cost. We should also observe simplicity in our clothes. We should not wear very tight clothes which make the movement of our limbs difficult.

We should observe simplicity in our speech and manners. We should be sweet, polite and humble in our talk. We should not boast, nor should we try to bully others. We should never lose our temper under any circumstances. We should be honest and straightforward in our dealings.

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We must have a simple life-style. We need not run after fashions. We should not spend more than our means. Our house should be built in a simple, cute way. We need not have very expensive gadgets in our houses except. Those which are essential for leading a comfortable tension-free life.

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Cambridge Dictionary

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Meaning of simplicity in English

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simplicity noun [U] ( EASY )

  • I prefer the second option - its advantages are simplicity and cheapness .
  • All the ideas have a stunning simplicity.
  • (as) easy as pie/ABC/anything/falling off a log idiom
  • accessibility
  • at the push of a button idiom
  • at the stroke of a pen idiom
  • be a matter of something idiom
  • frictionless
  • frictionlessly
  • over-simply
  • painting by numbers idiom
  • the path of least resistance idiom
  • with your eyes closed/shut idiom
  • within the capacity of someone/something

simplicity noun [U] ( NATURAL )

Simplicity noun [u] ( plain ), simplicity | intermediate english, examples of simplicity, collocations with simplicity.

These are words often used in combination with simplicity .

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Translations of simplicity

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to explain something to someone in a way that suggests that they are stupid; used especially when a man explains something to a woman that she already understands

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Definition of simplicity noun from the Oxford Advanced American Dictionary

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Most philosophers believe that, other things being equal, simpler theories are better. But what exactly does theoretical simplicity amount to? Syntactic simplicity, or elegance, measures the number and conciseness of the theory's basic principles. Ontological simplicity, or parsimony, measures the number of kinds of entities postulated by the theory. One issue concerns how these two forms of simplicity relate to one another. There is also an issue concerning the justification of principles, such as Occam's Razor, which favor simple theories. The history of philosophy has seen many approaches to defending Occam's Razor, from the theological justifications of the Early Modern period, to contemporary justifications employing results from probability theory and statistics.

1. Introduction

2. ontological parsimony, 3. a priori justifications of simplicity, 4. naturalistic justifications of simplicity, 5. probabilistic/statistical justifications of simplicity, 6.1 quantitative parsimony, 6.2 principles of plenitude, 6.3 simplicity and induction, other internet resources, related entries.

There is a widespread philosophical presumption that simplicity is a theoretical virtue. This presumption that simpler theories are preferable appears in many guises. Often it remains implicit; sometimes it is invoked as a primitive, self-evident proposition; other times it is elevated to the status of a ‘Principle’ and labeled as such (for example, the ‘Principle of Parsimony’). However, it is perhaps best known by the name ‘Occam's (or Ockham's) Razor.’ Simplicity principles have been proposed in various forms by theologians, philosophers, and scientists, from ancient through medieval to modern times. Thus Aristotle writes in his Posterior Analytics ,

We may assume the superiority ceteris paribus of the demonstration which derives from fewer postulates or hypotheses. [ 1 ]

Moving to the medieval period, Aquinas writes:

If a thing can be done adequately by means of one, it is superfluous to do it by means of several; for we observe that nature does not employ two instruments where one suffices (Aquinas, [BW], p. 129).

Kant—in the Critique of Pure Reason —supports the maxim that “rudiments or principles must not be unnecessarily multiplied ( entia praeter necessitatem non esse multiplicanda )” and argues that this is a regulative idea of pure reason which underlies scientists' theorizing about nature (Kant, 1781/1787, pp. 538–9). Both Galileo and Newton accepted versions of Occam's Razor. Indeed Newton includes a principle of parsimony as one of his three ‘Rules of Reasoning in Philosophy’ at the beginning of Book III of Principia Mathematica (1687):

Rule I: We are to admit no more causes of natural things than such as are both true and sufficient to explain their appearances.

Newton goes on to remark that “Nature is pleased with simplicity, and affects not the pomp of superfluous causes” (Newton 1687, p. 398). Galileo, in the course of making a detailed comparison of the Ptolemaic and Copernican models of the solar system, maintains that “Nature does not multiply things unnecessarily; that she makes use of the easiest and simplest means for producing her effects; that she does nothing in vain, and the like” (Galileo 1632, p. 397). Nor are scientific advocates of simplicity principles restricted to the ranks of physicists and astronomers. Here is the chemist Lavoisier writing in the late 18 th Century

If all of chemistry can be explained in a satisfactory manner without the help of phlogiston, that is enough to render it infinitely likely that the principle does not exist, that it is a hypothetical substance, a gratuitous supposition. It is, after all, a principle of logic not to multiply entities unnecessarily (Lavoisier 1862, pp. 623–4).

Compare this to the following passage from Einstein, writing 150 years later.

[T]he grand aim of all science…is to cover the greatest possible number of empirical facts by logical deductions from the smallest possible number of hypotheses or axioms (Einstein, quoted in Nash 1963, p. 173).

Editors of a recent volume on simplicity sent out surveys to 25 recent Nobel laureates in economics. Almost all replied that simplicity played a role in their research, and that simplicity is a desirable feature of economic theories (Zellner et al. 2001, p.2). Riesch (2010) interviewed 40 scientists and found a range of attitudes towards the nature and role of simplicity principles in science.

Within philosophy, Occam's Razor (OR) is often wielded against metaphysical theories which involve allegedly superfluous ontological apparatus. Thus materialists about the mind may use OR against dualism, on the grounds that dualism postulates an extra ontological category for mental phenomena. Similarly, nominalists about abstract objects may use OR against their platonist opponents, taking them to task for committing to an uncountably vast realm of abstract mathematical entities. The aim of appeals to simplicity in such contexts seem to be more about shifting the burden of proof, and less about refuting the less simple theory outright.

The philosophical issues surrounding the notion of simplicity are numerous and somewhat tangled. The topic has been studied in piecemeal fashion by scientists, philosophers, and statisticians (though for an invaluable book-length philosophical treatment see Sober 2015). The apparent familiarity of the notion of simplicity means that it is often left unanalyzed, while its vagueness and multiplicity of meanings contributes to the challenge of pinning the notion down precisely. [ 2 ] A distinction is often made between two fundamentally distinct senses of simplicity: syntactic simplicity (roughly, the number and complexity of hypotheses), and ontological simplicity (roughly, the number and complexity of things postulated). [ 3 ] These two facets of simplicity are often referred to as elegance and parsimony respectively. For the purposes of the present overview we shall follow this usage and reserve ‘parsimony’ specifically for simplicity in the ontological sense. It should be noted, however, that the terms ‘parsimony’ and ‘simplicity’ are used virtually interchangeably in much of the philosophical literature.

Philosophical interest in these two notions of simplicity may be organized around answers to three basic questions;

(i) How is simplicity to be defined? [Definition] (ii) What is the role of simplicity principles in different areas of inquiry? [Usage] (iii) Is there a rational justification for such simplicity principles? [Justification]

As we shall see, answering the definitional question, (i), is more straightforward for parsimony than for elegance. Conversely, more progress on the issue, (iii), of rational justification has been made for elegance than for parsimony. It should also be noted that the above questions can be raised for simplicity principles both within philosophy itself and in application to other areas of theorizing, especially empirical science.

With respect to question (ii), there is an important distinction to be made between two sorts of simplicity principle. Occam's Razor may be formulated as an epistemic principle: if theory T is simpler than theory T *, then it is rational (other things being equal) to believe T rather than T *. Or it may be formulated as a methodological principle: if T is simpler than T * then it is rational to adopt T as one's working theory for scientific purposes. These two conceptions of Occam's Razor require different sorts of justification in answer to question (iii).

In analyzing simplicity, it can be difficult to keep its two facets—elegance and parsimony—apart. Principles such as Occam's Razor are frequently stated in a way which is ambiguous between the two notions, for example, “Don't multiply postulations beyond necessity.” Here it is unclear whether ‘postulation’ refers to the entities being postulated, or the hypotheses which are doing the postulating, or both. The first reading corresponds to parsimony, the second to elegance. Examples of both sorts of simplicity principle can be found in the quotations given earlier in this section.

While these two facets of simplicity are frequently conflated, it is important to treat them as distinct. One reason for doing so is that considerations of parsimony and of elegance typically pull in different directions. Postulating extra entities may allow a theory to be formulated more simply, while reducing the ontology of a theory may only be possible at the price of making it syntactically more complex. For example the postulation of Neptune, at the time not directly observable, allowed the perturbations in the orbits of other observed planets to be explained without complicating the laws of celestial mechanics. There is typically a trade-off between ontology and ideology—to use the terminology favored by Quine—in which contraction in one domain requires expansion in the other. This points to another way of characterizing the elegance/parsimony distinction, in terms of simplicity of theory versus simplicity of world respectively. [ 4 ] Sober (2001) argues that both these facets of simplicity can be interpreted in terms of minimization. In the (atypical) case of theoretically idle entities, both forms of minimization pull in the same direction; postulating the existence of such entities makes both our theories (of the world) and the world (as represented by our theories) less simple than they might be.

Perhaps the most common formulation of the ontological form of Occam's Razor is the following:

(OR) Entities are not to be multiplied beyond necessity.

It should be noted that modern formulations of Occam's Razor are connected only very tenuously to the 14 th -century figure William of Ockham. We are not here interested in the exegetical question of how Ockham intended his ‘Razor’ to function, nor in the uses to which it was put in the context of medieval metaphysics. [ 5 ] Contemporary philosophers have tended to reinterpret OR as a principle of theory choice: OR implies that—other things being equal—it is rational to prefer theories which commit us to smaller ontologies. This suggests the following paraphrase of OR:

(OR 1 ) Other things being equal, if T 1 is more ontologically parsimonious than T 2 then it is rational to prefer T 1 to T 2 .

What does it mean to say that one theory is more ontologically parsimonious than another? The basic notion of ontological parsimony is quite straightforward, and is standardly cashed out in terms of Quine's concept of ontological commitment . A theory, T , is ontologically committed to F s if and only if T entails that F 's exist (Quine 1981, pp. 144–4). If two theories, T 1 and T 2 , have the same ontological commitments except that T 2 is ontologically committed to F s and T 1 is not, then T 1 is more parsimonious than T 2 . More generally, a sufficient condition for T 1 being more parsimonious than T 2 is for the ontological commitments of T 1 to be a proper subset of those of T 2 . Note that OR 1 is considerably weaker than the informal version of Occam's Razor, OR, with which we started. OR stipulates only that entities should not be multiplied beyond necessity . OR 1 , by contrast, states that entities should not be multiplied other things being equal , and this is compatible with parsimony being a comparatively weak theoretical virtue.

One ‘easy’ case where OR 1 can be straightforwardly applied is when a theory, T , postulates entities which are explanatorily idle. Excising these entities from T produces a second theory, T *, which has the same theoretical virtues as T but a smaller set of ontological commitments. Hence, according to OR 1 , it is rational to pick T * over T . (As previously noted, terminology such as ‘pick’ and ‘prefer’ is crucially ambiguous between epistemic and methodological versions of Occam's Razor. For the purposes of defining ontological parsimony, it is not necessary to resolve this ambiguity.) However, such cases are presumably rare, and this points to a more general worry concerning the narrowness of application of OR 1 . First, how often does it actually happen that we have two (or more) competing theories for which ‘other things are equal’? As biologist Kent Holsinger remarks,

Since Occam's Razor ought to be invoked only when several hypotheses explain the same set of facts equally well, in practice its domain will be very limited…[C]ases where competing hypotheses explain a phenomenon equally well are comparatively rare (Holsinger 1980, pp. 144–5).

Second, how often are one candidate theory's ontological commitments a proper subset of another's? Much more common are situations where ontologies of competing theories overlap, but each theory has postulates which are not made by the other. Straightforward comparisons of ontological parsimony are not possible in such cases.

Before setting aside the definitional question for ontological parsimony, one further distinction should be mentioned. This distinction is between qualitative parsimony (roughly, the number of types (or kinds) of thing postulated) and quantitative parsimony (roughly, the number of individual things postulated). [ 6 ] The default reading of Occam's Razor in the bulk of the philosophical literature is as a principle of qualitative parsimony. Thus Cartesian dualism, for example, is less qualitatively parsimonious than materialism because it is committed to two broad kinds of entity (mental and physical) rather than one. Section 6.1 contains a brief discussion of quantitative parsimony; apart from this the focus will be on the qualitative notion. It should be noted that interpreting Occam's Razor in terms of kinds of entity brings with it some extra philosophical baggage of its own. In particular, judgments of parsimony become dependent on how the world is sliced up into kinds. Nor is guidance from extra-philosophical usage—and in particular from science—always clearcut. For example, is a previously undiscovered subatomic particle made up of a novel rearrangement of already discovered sub-particles a new ‘kind’? What about a biological species, which presumably does not contain any novel basic constituents? Also, ought more weight to be given to broad and seemingly fundamental divisions of kind—for example between the mental and physical—than between more parochial divisions? Intuitively, the postulation of a new kind of matter would seem to require much more extensive and solid justification than the postulation of a new sub-species of spider. [ 7 ]

The third and final question from Section 1 concerns potential justifications for principles of ontological parsimony such as Occam's Razor. The demand for justification of such principles can be understood in two importantly distinct ways, corresponding to the distinction between epistemic principles and methodological principles made at the end of Section 1. Justifying an epistemic principle requires answering an epistemic question: why are parsimonious theories more likely to be true? Justifying a methodological principle requires answering a pragmatic question: why does it make practical sense for theorists to adopt parsimonious theories? [ 8 ] Most attention in the literature has centered on the first, epistemic question. It is easy to see how syntactic elegance in a theory can bring with it pragmatic advantages such as being more perspicuous, being easier to use and manipulate, and so on. But the case is more difficult to make for ontological parsimony. [ 9 ] It is unclear what particular pragmatic disadvantages accrue to theories which postulate extra kinds of entities; indeed—as was mentioned in the previous section—such postulations can often bring with them striking syntactic simplification.

Before looking at approaches to answering the epistemic justification question, mention should be made of two positions in the literature which do not fall squarely into either the pragmatic or epistemic camp. The first position, associated primarily with Quine, argues that parsimony carries with it pragmatic advantages and that pragmatic considerations themselves provide rational grounds for discriminating between competing theories (Quine 1966, Walsh 1979). The Quinean position bases an answer to the second question on the answer to the first, thus blurring the boundary between pragmatic and epistemic justification. The second position, due to Sober, rejects the implicit assumption in both the above questions that some global justification of parsimony can be found (Sober 1988, 1994). Instead Sober argues that appeals to parsimony always depend on local background assumptions for their rational justification. Thus Sober writes:

The legitimacy of parsimony stands or falls, in a particular research context, on subject matter specific (and a posteriori ) considerations. […] What makes parsimony reasonable in one context may have nothing in common with why it matters in another (Sober 1994).

Philosophers who reject these arguments of Quine and Sober, and thus take the demand for a global, epistemic justification seriously, have developed a variety of approaches to justifying parsimony. Most of these approaches can be collected under two broad headings:

(A) A priori philosophical, metaphysical, or theological justifications. (B) Naturalistic justifications, based on appeal to scientific practice.

As we shall see, the contrast between these two sorts of approach mirrors a broader divide between the rival traditions of rationalism and empiricism in philosophy as a whole.

As well as parsimony, the question of rational justification can also be raised for principles based on elegance, the second facet of simplicity distinguished in Section 1. Approaches to justifying elegance along the lines of (A) and (B) are possible, but much of the recent work falls under a third category;

(C) Justifications based on results from probability theory and/or statistics.

The next three sections examine these three modes of justification of simplicity principles. The a priori justifications in category (A) concern simplicity in both its parsimony and elegance forms. The justifications falling under category (B) pertain mostly to parsimony, while those falling under category (C) pertain mostly to elegance.

The role of simplicity as a theoretical virtue seems so widespread, fundamental, and implicit that many philosophers, scientists, and theologians have sought a justification for principles such as Occam's Razor on similarly broad and basic grounds. This rationalist approach is connected to the view that making a priori simplicity assumptions is the only way to get around the underdetermination of theory by data. Until the second half of the 20 th Century this was probably the predominant approach to the issue of simplicity. More recently, the rise of empiricism within analytic philosophy led many philosophers to argue disparagingly that a priori justifications keep simplicity in the realm of metaphysics (see Zellner et al. 2001, p.1). Despite its changing fortunes, the rationalist approach to simplicity still has its adherents. For example, Richard Swinburne writes:

I seek…to show that—other things being equal—the simplest hypothesis proposed as an explanation of phenomena is more likely to be the true one than is any other available hypothesis, that its predictions are more likely to be true than those of any other available hypothesis, and that it is an ultimate a priori epistemic principle that simplicity is evidence for truth (Swinburne 1997, p. 1).

(i) Theological Justifications

The post-medieval period coincided with a gradual transition from theology to science as the predominant means of revealing the workings of nature. In many cases, espoused principles of parsimony continued to wear their theological origins on their sleeves, as with Leibniz's thesis that God has created the best and most complete of all possible worlds, and his linking of this thesis to simplifying principles such as light always taking the (time-wise) shortest path. A similar attitude—and rhetoric—is shared by scientists through the early modern and modern period, including Kepler, Newton, and Maxwell.

Some of this rhetoric has survived to the present day, especially among theoretical physicists and cosmologists such as Einstein and Hawking. [ 10 ] Yet there are clear dangers with relying on a theological justification of simplicity principles. Firstly, many—probably most—contemporary scientists are reluctant to link methodological principles to religious belief in this way. Secondly, even those scientists who do talk of ‘God’ often turn out to be using the term metaphorically, and not necessarily as referring to the personal and intentional Being of monotheistic religions. Thirdly, even if there is a tendency to justify simplicity principles via some literal belief in the existence of God, such justification is only rational to the extent that rational arguments can be given for the existence of God. [ 11 ]

For these reasons, few philosophers today are content to rest with a theological justification of simplicity principles. Yet there is no doubting the influence such justifications have had on past and present attitudes to simplicity. As Smart (1994) writes:

There is a tendency…for us to take simplicity…as a guide to metaphysical truth. Perhaps this tendency derives from earlier theological notions: we expect God to have created a beautiful universe (Smart 1984, p. 121).

(ii) Metaphysical Justifications

One approach to justifying simplicity principles is to embed such principles in some more general metaphysical framework. Perhaps the clearest historical example of systematic metaphysics of this sort is the work of Leibniz. The leading contemporary example of this approach—and in one sense a direct descendent of Leibniz's methodology—is the possible worlds framework of David Lewis. In one of his earlier works, Lewis writes,

I subscribe to the general view that qualitative parsimony is good in a philosophical or empirical hypothesis (Lewis 1973, p. 87).

Lewis has been attacked for not saying more about what exactly he takes simplicity to be (see Woodward 2003). However, what is clear is that simplicity plays a key role in underpinning his metaphysical framework, and is also taken to be a prima facie theoretical virtue.

Though Occam's Razor has arguably been a longstanding and important tool in the rise of analytic metaphysics, it has only been comparatively recently that there has been much debate among metaphysicians concerning the principle itself. Cameron (2010), Schaffer (2010), and Sider (2013) each argue for a version of Occam's Razor that focuses specifically on fundamental entities. Schaffer (2015, p. 647) dubs this version "The Laser" and formulates it as an injunction not to multiply fundamental entities beyond necessity, together with the implicit understanding that there is no such injunction against multiplying derivative entities. Baron and Tallant (forthcoming) attack 'razor-revisers' such as Schaffer, arguing that principles such as The Laser fail to mesh with actual patterns of theory-choice in science and are also not vindicated by some of the lines of justification for Occam's Razor.

(iii) ‘Intrinsic Value’ Justifications

Some philosophers have approached the issue of justifying simplicity principles by arguing that simplicity has intrinsic value as a theoretical goal. Sober, for example, writes:

Just as the question ‘why be rational?’ may have no non-circular answer, the same may be true of the question ‘why should simplicity be considered in evaluating the plausibility of hypotheses?’ (Sober 2001, p. 19).

Such intrinsic value may be ‘primitive’ in some sense, or it may be analyzable as one aspect of some broader value. For those who favor the second approach, a popular candidate for this broader value is aesthetic. Derkse (1992) is a book-length development of this idea, and echoes can be found in Quine's remarks—in connection with his defense of Occam's Razor—concerning his taste for “clear skies” and “desert landscapes.” In general, forging a connection between aesthetic virtue and simplicity principles seems better suited to defending methodological rather than epistemic principles.

(iv) Justifications via Principles of Rationality

Another approach is to try to show how simplicity principles follow from other better established or better understood principles of rationality. [ 12 ] For example, some philosophers just stipulate that they will take ‘simplicity’ as shorthand for whatever package of theoretical virtues is (or ought to be) characteristic of rational inquiry. A more substantive alternative is to link simplicity to some particular theoretical goal, for example unification (see Friedman 1983). While this approach might work for elegance, it is less clear how it can be maintained for ontological parsimony. Conversely, a line of argument which seems better suited to defending parsimony than to defending elegance is to appeal to a principle of epistemological conservatism. Parsimony in a theory can be viewed as minimizing the number of ‘new’ kinds of entities and mechanisms which are postulated. This preference for old mechanisms may in turn be justified by a more general epistemological caution, or conservatism, which is characteristic of rational inquiry.

Note that the above style of approach can be given both a rationalist and an empiricist gloss. If unification, or epistemological conservatism, are themselves a priori rational principles, then simplicity principles stand to inherit this feature if this approach can be carried out successfully. However, philosophers with empiricist sympathies may also pursue analysis of this sort, and then justify the base principles either inductively from past success or naturalistically from the fact that such principles are in fact used in science.

To summarize, the main problem with a priori justifications of simplicity principles is that it can be difficult to distinguish between an a priori defense and no defense(!). Sometimes the theoretical virtue of simplicity is invoked as a primitive, self-evident proposition that cannot be further justified or elaborated upon. (One example is the beginning of Goodman and Quine's 1947 paper, where they state that their refusal to admit abstract objects into their ontology is “based on a philosophical intuition that cannot be justified by appeal to anything more ultimate.”) (Goodman & Quine 1947, p. 174). It is unclear where leverage for persuading skeptics of the validity of such principles can come from, especially if the grounds provided are not themselves to beg further questions. Misgivings of this sort have led to a shift away from justifications rooted in ‘first philosophy’ towards approaches which engage to a greater degree with the details of actual practice, both scientific and statistical. These other approaches will be discussed in the next two sections.

The rise of naturalized epistemology as a movement within analytic philosophy in the second half of the 20 th Century has largely sidelined the rationalist style of approach. From the naturalistic perspective, philosophy is conceived of as continuous with science, and not as having some independently privileged status. The perspective of the naturalistic philosopher may be broader, but her concerns and methods are not fundamentally different from those of the scientist. The conclusion is that science neither needs—nor can legitimately be given—external philosophical justification. It is against this broadly naturalistic background that some philosophers have sought to provide an epistemic justification of simplicity principles, and in particular principles of ontological parsimony such as Occam's Razor.

The main empirical evidence bearing on this issue consists of the patterns of acceptance and rejection of competing theories by working scientists. Einstein's development of Special Relativity—and its impact on the hypothesis of the existence of the electromagnetic ether—is one of the episodes most often cited (by both philosophers and scientists) as an example of Occam's Razor in action (see Sober 1981, p. 153). The ether is by hypothesis a fixed medium and reference frame for the propagation of light (and other electromagnetic waves). The Special Theory of Relativity includes the radical postulate that the speed of a light ray through a vacuum is constant relative to an observer no matter what the state of motion of the observer. Given this assumption, the notion of a universal reference frame is incoherent. Hence Special Relativity implies that the ether does not exist.

This episode can be viewed as the replacement of an empirically adequate theory (the Lorentz-Poincaré theory) by a more ontologically parsimonious alternative (Special Relativity). Hence it is often taken to be an example of Occam's Razor in action. The problem with using this example as evidence for Occam's Razor is that Special Relativity (SR) has several other theoretical advantages over the Lorentz-Poincaré (LP) theory in addition to being more ontologically parsimonious. Firstly, SR is a simpler and more unified theory than LP, since in order to ‘save the phenomena’ a number of ad hoc and physically unmotivated patches had been added to LP. Secondly, LP raises doubts about the physical meaning of distance measurements. According to LP, a rod moving with velocity, v , contracts by a factor of (1 − v 2 / c 2 ) 1/2 . Thus only distance measurements that are made in a frame at rest relative to the ether are valid without modification by a correction factor. However, LP also implies that motion relative to the ether is in principle undetectable. So how is distance to be measured? In other words, the issue here is complicated by the fact that—according to LP—the ether is not just an extra piece of ontology but an undetectable extra piece. Given these advantages of SR over LP, it seems clear that the ether example is not merely a case of ontological parsimony making up for an otherwise inferior theory.

A genuine test-case for Occam's Razor must involve an ontologically parsimonious theory which is not clearly superior to its rivals in other respects. An instructive example is the following historical episode from biogeography, a scientific subdiscipline which originated towards the end of the 18 th Century, and whose central purpose was to explain the geographical distribution of plant and animal species. [ 13 ] In 1761, the French naturalist Buffon proposed the following law;

(BL) Areas separated by natural barriers have distinct species.

There were also known exceptions to Buffon's Law, for example remote islands which share (so-called) ‘cosmopolitan’ species with continental regions a large distance away.

Two rival theories were developed to explain Buffon's Law and its occasional exceptions. According to the first theory, due to Darwin and Wallace, both facts can be explained by the combined effects of two causal mechanisms—dispersal, and evolution by natural selection. The explanation for Buffon's Law is as follows. Species gradually migrate into new areas, a process which Darwin calls “dispersal.” As natural selection acts over time on the contingent initial distribution of species in different areas, completely distinct species eventually evolve. The existence of cosmopolitan species is explained by “improbable dispersal,” Darwin's term for dispersal across seemingly impenetrable barriers by “occasional means of transport” such as ocean currents, winds, and floating ice. Cosmopolitan species are explained as the result of improbable dispersal in the relatively recent past.

In the 1950's, Croizat proposed an alternative to the Darwin-Wallace theory which rejects their presupposition of geographical stability. Croizat argues that tectonic change, not dispersal, is the principal causal mechanism which underlies Buffon's Law. Forces such as continental drift, the submerging of ocean floors, and the formation of mountain ranges have acted within the time frame of evolutionary history to create natural barriers between species where at previous times there were none. Croizat's theory was the sophisticated culmination of a theoretical tradition which stretched back to the late 17 th Century. Followers of this so-called “extensionist” tradition had postulated the existence of ancient land bridges to account for anomalies in the geographical distribution of plants and animals. [ 14 ]

Extensionist theories are clearly less ontologically parsimonious than Dispersal Theories, since the former are committed to extra entities such as land bridges or movable tectonic plates. Moreover, Extensionist theories were (given the evidence then available) not manifestly superior in other respects. Darwin was an early critic of Extensionist theories, arguing that they went beyond the “legitimate deductions of science.” Another critic of Extensionist theories pointed to their “dependence on ad hoc hypotheses, such as land bridges and continental extensions of vast extent, to meet each new distributional anomaly” (Fichman 1977, p. 62) The debate over the more parsimonious Dispersal theories centered on whether the mechanism of dispersal is sufficient on its own to explain the known facts about species distribution, without postulating any extra geographical or tectonic entities.

The criticisms leveled at the Extensionist and Dispersal theories follow a pattern that is characteristic of situations in which one theory is more ontologically parsimonious than its rivals. In such situations the debate is typically over whether the extra ontology is really necessary in order to explain the observed phenomena. The less parsimonious theories are condemned for profligacy, and lack of direct evidential support. The more parsimonious theories are condemned for their inadequacy to explain the observed facts. This illustrates a recurring theme in discussions of simplicity—both inside and outside philosophy—namely, how the correct balance between simplicity and goodness of fit ought to be struck. This theme takes center stage in the statistical approaches to simplicity discussed in Section 5.

Less work has been done on describing episodes in science where elegance—as opposed to parsimony—has been (or may have been) the crucial factor. This may just reflect the fact that considerations linked to elegance are so pervasive in scientific theory choice as to be unremarkable as a topic for special study. A notable exception to this general neglect is the area of celestial mechanics, where the transition from Ptolemy to Copernicus to Kepler to Newton is an oft-cited example of simplicity considerations in action, and a case study which makes much more sense when seen through the lens of elegance rather than of parsimony. [ 15 ]

Naturalism depends on a number of presuppositions which are open to debate. But even if these presuppositions are granted, the naturalistic project of looking to science for methodological guidance within philosophy faces a major difficulty, namely how to ‘read off’ from actual scientific practice what the underlying methodological principles are supposed to be. Burgess, for example, argues that what the patterns of scientific behavior show is not a concern with multiplying entities per se , but a concern more specifically with multiplying ‘causal mechanisms’ (Burgess 1998). And Sober considers the debate in psychology over psychological egoism versus motivational pluralism, arguing that the former theory postulates fewer types of ultimate desire but a larger number of causal beliefs, and hence that comparing the parsimony of these two theories depends on what is counted and how (Sober 2001, pp. 14–5). Some of the concerns raised in Sections 1 and 2 also reappear in this context; for example, how the world is sliced up into kinds effects the extent to which a given theory ‘multiplies’ kinds of entity. Justifying a particular way of slicing becomes more difficult once the epistemological naturalist leaves behind the a priori , metaphysical presuppositions of the rationalist approach.

One philosophical debate where these worries over naturalism become particularly acute is the issue of the application of parsimony principles to abstract objects. The scientific data is—in an important sense—ambiguous. Applications of Occam's Razor in science are always to concrete, causally efficacious entities, whether land-bridges, unicorns, or the luminiferous ether. Perhaps scientists apply an unrestricted version of Occam's Razor to that portion of reality in which they are interested, namely the concrete, causal, spatiotemporal world. Or perhaps scientists apply a ‘concretized’ version of Occam's Razor unrestrictedly. Which is the case? The answer determines which general philosophical principle we end up with: ought we to avoid the multiplication of objects of whatever kind, or merely the multiplication of concrete objects? The distinction here is crucial for a number of central philosophical debates. Unrestricted Occam's Razor favors monism over dualism, and nominalism over platonism. By contrast, ‘concretized’ Occam's Razor has no bearing on these debates, since the extra entities in each case are not concrete.

The two approaches discussed in Sections 3 and 4— a priori rationalism and naturalized empiricism—are both in some sense extreme. Simplicity principles are taken either to have no empirical grounding, or to have solely empirical grounding. Perhaps as a result, both these approaches yield vague answers to certain key questions about simplicity. In particular, neither seems equipped to answer how exactly simplicity ought to be balanced against empirical adequacy. Simple but wildly inaccurate theories are not hard to come up with. Nor are accurate theories which are highly complex. But how much accuracy should be sacrificed for a gain in simplicity? The black-and-white boundaries of the rationalism/empiricism divide may not provide appropriate tools for analyzing this question. In response, philosophers have recently turned to the mathematical framework of probability theory and statistics, hoping in the process to combine sensitivity to actual practice with the ‘trans-empirical’ strength of mathematics.

Philosophically influential early work in this direction was done by Jeffreys and by Popper, both of whom tried to analyze simplicity in probabilistic terms. Jeffreys argued that “the simpler laws have the greater prior probability,” and went on to provide an operational measure of simplicity, according to which the prior probability of a law is 2 − k , where k = order + degree + absolute values of the coefficients, when the law is expressed as a differential equation (Jeffreys 1961, p. 47). A generalization of Jeffreys' approach is to look not at specific equations, but at families of equations. For example, one might compare the family, LIN, of linear equations (of the form y = a + bx ) with the family, PAR, of parabolic equations (of the form y = a + bx + cx 2 ). Since PAR is of higher degree than LIN, Jeffreys' proposal assigns higher probability to LIN. Laws of this form are intuitively simpler (in the sense of being more elegant).

Popper (1959) points out that Jeffreys' proposal, as it stands, contradicts the axioms of probability. Every member of LIN is also a member of PAR, where the coefficient, c , is set to 0. Hence ‘Law, L , is a member of LIN’ entails ‘Law, L , is a member of PAR.’ Jeffreys' approach assigns higher probability to the former than the latter. But it follows from the axioms of probability that when A entails B , the probability of B is greater than or equal to the probability of A . Popper argues, in contrast to Jeffreys, that LIN has lower prior probability than PAR. Hence LIN is—in Popper's sense—more falsifiable, and hence should be preferred as the default hypothesis. One response to Popper's objection is to amend Jeffrey's proposal and restrict members of PAR to equations where c ≠ 0.

More recent work on the issue of simplicity has borrowed tools from statistics as well as from probability theory. It should be noted that the literature on this topic tends to use the terms ‘simplicity’ and ‘parsimony’ more-or-less interchangeably (see Sober 2003). But, whichever term is preferred, there is general agreement among those working in this area that simplicity is to be cashed out in terms of the number of free (or ‘adjustable’) parameters of competing hypotheses. Thus the focus here is totally at the level of theory. Philosophers who have made important contributions to this approach include Forster and Sober (1994) and Lange (1995).

The standard case in the statistical literature on parsimony concerns curve-fitting . [ 16 ] We imagine a situation in which we have a set of discrete data points and are looking for the curve (i.e. function) which has generated them. The issue of what family of curves the answer belongs in (e.g. in LIN or in PAR) is often referred to as model-selection . The basic idea is that there are two competing criteria for model selection—parsimony and goodness of fit. The possibility of measurement error and ‘noise’ in the data means that the correct curve may not go through every data point. Indeed, if goodness of fit were the only criterion then there would be a danger of ‘overfitting’ the model to accidental discrepancies unrepresentative of the broader regularity. Parsimony acts as a counterbalance to such overfitting, since a curve passing through every data point is likely to be very convoluted and hence have many adjusted parameters.

If proponents of the statistical approach are in general agreement that simplicity should be cashed out in terms of number of parameters, there is less unanimity over what the goal of simplicity principles ought to be. This is partly because the goal is often not made explicit. (An analogous issue arises in the case of Occam's Razor. ‘Entities are not to be multiplied beyond necessity.’ But necessity for what , exactly?) Forster distinguishes two potential goals of model selection, namely probable truth and predictive accuracy, and claims that these are importantly distinct (Forster 2001, p. 95). Forster argues that predictive accuracy tends to be what scientists care about most. They care less about the probability of an hypothesis being exactly right than they do about it having a high degree of accuracy.

One reason for investigating statistical approaches to simplicity is a dissatisfaction with the vagaries of the a priori and naturalistic approaches. Statisticians have come up with a variety of numerically specific proposals for the trade-off between simplicity and goodness of fit. However, these alternative proposals disagree about the ‘cost’ associated with more complex hypotheses. Two leading contenders in the recent literature on model selection are the Akaike Information Criterion [AIC] and the Bayesian Information Criterion [BIC]. AIC directs theorists to choose the model with the highest value of {log L ( Θ k )/ n } − k/n , where Θ k is the best-fitting member of the class of curves of polynomial degree k , log L is log-likelihood, and n is the sample size. By contrast, BIC maximizes the value of {log L ( Θ k )/ n } − k log[ n ]/2 n . In effect, BIC gives an extra positive weighting to simplicity by a factor of log[ n ]/2 (where n is the size of the sample). [ 17 ]

Extreme answers to the trade-off problem seem to be obviously inadequate. Always picking the model with the best fit to the data, regardless of its complexity, faces the prospect (mentioned earlier) of ‘overfitting’ error and noise in the data. Always picking the simplest model, regardless of its fit to the data, cuts the model free from any link to observation or experiment. Forster associates the ‘Always Complex’ and the ‘Always Simple’ rule with empiricism and rationalism respectively. [ 18 ] All the candidate rules that are seriously discussed by statisticians fall in between these two extremes. Yet they differ in their answers over how much weight to give simplicity in its trade-off against goodness of fit. In addition to AIC and BIC, other rules include Neyman-Pearson hypothesis testing, and the minimum description length (MDL) criterion.

There are at least three possible responses to the varying answers to the trade-off problem provided by different criteria. One response, favored by Forster and by Sober, is to argue that there is no genuine conflict here because the different criteria have different aims. Thus AIC and BIC might both be optimal criteria, if AIC is aiming to maximize predictive accuracy whereas BIC is aiming to maximize probable truth. Another difference that may influence the choice of criterion is whether the goal of the model is to extrapolate beyond given data or interpolate between known data points. A second response, typically favored by statisticians, is to argue that the conflict is genuine but that it has the potential to be resolved by analyzing (using both mathematical and empirical methods) which criterion performs best over the widest class of possible situations. A third, more pessimistic, response is to argue that the conflict is genuine but is unresolvable. Kuhn (1977) takes this line, claiming that how much weight individual scientists give a particular theoretical virtue, such as simplicity, is solely a matter of taste, and is not open to rational resolution. McAllister (2007) draws ontological morals from a similar conclusion, arguing that sets of data typically exhibit multiple patterns, and that different patterns may be highlighted by different quantitative techniques.

Aside from this issue of conflicting criteria, there are other problems with the statistical approach to simplicity. One problem, which afflicts any approach emphasizing the elegance aspect of simplicity, is language relativity. Crudely put, hypotheses which are syntactically very complex in one language may be syntactically very simple in another. The traditional philosophical illustration of this problem is Goodman's ‘grue’ challenge to induction. Are statistical approaches to the measurement of simplicity similarly language relative, and—if so—what justifies choosing one language over another? It turns out that the statistical approach has the resources to at least partially deflect the charge of language relativity. Borrowing techniques from information theory, it can be shown that certain syntactic measures of simplicity are asymptotically independent of choice of measurement language. [ 19 ]

A second problem for the statistical approach is whether it can account not only for our preference for small numbers over large numbers (when it comes to picking values for coefficients or exponents in model equations), but also our preference for whole numbers and simple fractions over other values. In Gregor Mendel's original experiments on the hybridization of garden peas, he crossed pea varieties with different specific traits, such as tall versus short or green seeds versus yellow seeds, and then self-pollinated the hybrids for one or more generations. [ 20 ] In each case one trait was present in all the first-generation hybrids, but both traits were present in subsequent generations. Across his experiments with seven different such traits, the ratio of dominant trait to recessive trait averaged 2.98 : 1. On this basis, Mendel hypothesized that the true ratio is 3 : 1. This ‘rounding’ was made prior to the formulation of any explanatory model, hence it cannot have been driven by any theory-specific consideration. This raises two related questions. First, in what sense is the 3 : 1 ratio hypothesis simpler than the 2.98 : 1 ratio hypothesis? Second, can this choice be justified within the framework of the statistical approach to simplicity? The more general worry lying behind these questions is whether the statistical approach, in defining simplicity in terms of number of adjustable parameters, is replacing the broad issue of simplicity with a more narrowly—and perhaps arbitrarily—defined set of issues.

A third problem with the statistical approach concerns whether it can shed any light on the specific issue of ontological parsimony. At first glance, one might think that the postulation of extra entities can be attacked on probabilistic grounds. For example, quantum mechanics together with the postulation ‘There exist unicorns’ is less probable than quantum mechanics alone, since the former logically entails the latter. However, as Sober has pointed out, it is important here to distinguish between agnostic Occam's Razor and atheistic Occam's Razor. Atheistic OR directs theorists to claim that unicorns do not exist, in the absence of any compelling evidence in their favor. And there is no relation of logical entailment between { QM + there exist unicorns} and { QM + there do not exist unicorns}. This also links back to the terminological issue. Models involving circular orbits are more parsimonious—in the statisticians' sense of ‘parsimonious’—than models involving elliptical orbits, but the latter models do not postulate the existence of any more things in the world.

6. Other Issues Concerning Simplicity

This section addresses three distinct issues concerning simplicity and its relation to other methodological issues. These issues concern quantitative parsimony, plenitude, and induction.

Theorists tend to be frugal in their postulation of new entities. When a trace is observed in a cloud-chamber, physicists may seek to explain it in terms of the influence of a hitherto unobserved particle. But, if possible, they will postulate one such unobserved particle, not two, or twenty, or 207 of them. This desire to minimize the number of individual new entities postulated is often referred to as quantitative parsimony . David Lewis articulates the attitude of many philosophers when he writes:

I subscribe to the general view that qualitative parsimony is good in a philosophical or empirical hypothesis; but I recognize no presumption whatever in favour of quantitative parsimony (Lewis 1973, p. 87).

Is the initial assumption that one particle is acting to cause the observed trace more rational than the assumption that 207 particles are so acting? Or is it merely the product of wishful thinking, aesthetic bias, or some other non-rational influence?

Nolan (1997) examines these questions in the context of the discovery of the neutrino. [ 21 ] Physicists in the 1930's were puzzled by certain anomalies arising from experiments in which radioactive atoms emit electrons during so-called Beta decay. In these experiments the total spin of the particles in the system before decay exceeds by 1 / 2 the total spin of the (observed) emitted particles. Physicists' response was to posit a ‘new’ fundamental particle, the neutrino, with spin 1 / 2 and to hypothesize that exactly one neutrino is emitted by each electron during Beta decay.

Note that there is a wide range of very similar neutrino theories which can also account for the missing spin.

H 1 : 1 neutrino with a spin of 1 / 2 is emitted in each case of Beta decay. H 2 : 2 neutrinos, each with a spin of 1 / 4 are emitted in each case of Beta decay.

and, more generally, for any positive integer n ,

H n : n neutrinos, each with a spin of 1 / 2 n are emitted in each case of Beta decay.

Each of these hypotheses adequately explains the observation of a missing 1 / 2 -spin following Beta decay. Yet the most quantitatively parsimonious hypothesis, H 1 , is the obvious default choice. [ 22 ]

One promising approach is to focus on the relative explanatory power of the alternative hypotheses, H 1 , H 2 , … H n . When neutrinos were first postulated in the 1930's, numerous experimental set-ups were being devised to explore the products of various kinds of particle decay. In none of these experiments had cases of ‘missing’ 1 / 3 -spin, or 1 / 4 -spin, or 1 / 100 -spin been found. The absence of these smaller fractional spins was a phenomenon which competing neutrino hypotheses might potentially help to explain.

Consider the following two competing neutrino hypotheses:

H 1 : 1 neutrino with a spin of 1 / 2 is emitted in each case of Beta decay. H 10 : 10 neutrinos, each with a spin of 1 / 20 , are emitted in each case of Beta decay.

Why has no experimental set-up yielded a ‘missing’ spin-value of 1 / 20 ? H 1 allows a better answer to this question than H 10 does, for H 1 is consistent with a simple and parsimonious explanation, namely that there exist no particles with spin 1 / 20 (or less). In the case of H 10 , this potential explanation is ruled out because H 10 explicitly postulates particles with spin 1 / 20 . Of course, H 10 is consistent with other hypotheses which explain the non-occurrence of missing 1 / 20 -spin. For example, one might conjoin to H 10 the law that neutrinos are always emitted in groups of ten. However, this would make the overall explanation less syntactically simple, and hence less virtuous in other respects. In this case, quantitative parsimony brings greater explanatory power. Less quantitatively parsimonious hypotheses can match this power only by adding auxiliary claims which decrease their syntactic simplicity. Thus the preference for quantitatively parsimonious hypotheses emerges as one facet of a more general preference for hypotheses with greater explanatory power.

One distinctive feature of the neutrino example is that it is ‘additive.’ It involves postulating the existence of a collection of qualitatively identical objects which collectively explain the observed phenomenon. The explanation is additive in the sense that the overall phenomenon is explained by summing the individual positive contributions of each object. [ 23 ] Whether the above approach can be extended to non-additive cases involving quantitative parsimony is an interesting question. Jansson and Tallant (forthcoming) argue that it can, and they offer a probabilistic analysis that aims to bring together a variety of different cases where quantitative parsimony plays a role in hypothesis selection. Consider a case in which the aberrations of a planet's orbit can be explained by postulating a single unobserved planet, or it can be explained by postulating two or more unobserved planets. In order for the latter situation to be actual, the multiple planets must orbit in certain restricted ways so as to match the effects of a single planet. Prima facie this is unlikely, and this counts against the less quantitatively parsimonious hypothesis.

Ranged against the principles of parsimony discussed in previous sections is an equally firmly rooted (though less well-known) tradition of what might be termed “principles of explanatory sufficiency.” [ 24 ] These principles have their origins in the same medieval controversies that spawned Occam's Razor. Ockham's contemporary, Walter of Chatton, proposed the following counter-principle to Occam's Razor:

[I]f three things are not enough to verify an affirmative proposition about things, a fourth must be added, and so on (quoted in Maurer 1984, p. 464).

A related counter-principle was later defended by Kant:

The variety of entities should not be rashly diminished (Kant 1781/1787, p. 541). Entium varietates non temere esse minuendas .

There is no inconsistency in the coexistence of these two families of principles, for they are not in direct conflict with each other. Considerations of parsimony and of explanatory sufficiency function as mutual counter-balances, penalizing theories which stray into explanatory inadequacy or ontological excess. [ 25 ] What we see here is an historical echo of the contemporary debate among statisticians concerning the proper trade-off between simplicity and goodness of fit.

There is, however, a second family of principles which do appear directly to conflict with Occam's Razor. These are so-called ‘principles of plenitude.’ Perhaps the best-known version is associated with Leibniz, according to whom God created the best of all possible worlds with the greatest number of possible entities. More generally, a principle of plenitude claims that if it is possible for an object to exist then that object actually exists. Principles of plenitude conflict with Occam's Razor over the existence of physically possible but explanatorily idle objects. Our best current theories presumably do not rule out the existence of unicorns, but nor do they provide any support for their existence. According to Occam's Razor we ought not to postulate the existence of unicorns. According to a principle of plenitude we ought to postulate their existence.

The rise of particle physics and quantum mechanics in the 20 th Century led to various principles of plenitude being appealed to by scientists as an integral part of their theoretical framework. A particularly clear-cut example of such an appeal is the case of magnetic monopoles. [ 26 ] The 19 th -century theory of electromagnetism postulated numerous analogies between electric charge and magnetic charge. One theoretical difference is that magnetic charges must always come in oppositely-charged pairs, called “dipoles” (as in the North and South poles of a bar magnet), whereas single electric charges, or “monopoles,” can exist in isolation. However, no actual magnetic monopole had ever been observed. Physicists began to wonder whether there was some theoretical reason why monopoles could not exist. It was initially thought that the newly developed theory of quantum mechanics ruled out the possibility of magnetic monopoles, and this is why none had ever been detected. However, in 1931 the physicist Paul Dirac showed that the existence of monopoles is consistent with quantum mechanics, although it is not required by it. Dirac went on to assert the existence of monopoles, arguing that their existence is not ruled out by theory and that “under these circumstances one would be surprised if Nature had made no use of it” (Dirac 1930, p. 71, note 5). This appeal to plenitude was widely—though not universally—accepted by other physicists.

One of the elementary rules of nature is that, in the absence of laws prohibiting an event or phenomenon it is bound to occur with some degree of probability. To put it simply and crudely: anything that can happen does happen. Hence physicists must assume that the magnetic monopole exists unless they can find a law barring its existence (Ford 1963, p. 122).

Others have been less impressed by Dirac's line of argument:

Dirac's…line of reasoning, when conjecturing the existence of magnetic monopoles, does not differ from 18 th -century arguments in favour of mermaids…[A]s the notion of mermaids was neither intrinsically contradictory nor colliding with current biological laws, these creatures were assumed to exist. [ 27 ]

It is difficult to know how to interpret these principles of plenitude. Quantum mechanics diverges from classical physics by replacing of a deterministic model of the universe with a model based on objective probabilities. According to this probabilistic model, there are numerous ways the universe could have evolved from its initial state, each with a certain probability of occurring that is fixed by the laws of nature. Consider some kind of object, say unicorns, whose existence is not ruled out by the initial conditions plus the laws of nature. Then one can distinguish between a weak and a strong version of the principle of plenitude. According to the weak principle, if there is a small finite probability of unicorns existing then given enough time and space unicorns will exist. According to the strong principle, it follows from the theory of quantum mechanics that if it is possible for unicorns to exist then they do exist. One way in which this latter principle may be cashed out is in the ‘many-worlds’ interpretation of quantum mechanics, according to which reality has a branching structure in which every possible outcome is realized.

The problem of induction is closely linked to the issue of simplicity. One obvious link is between the curve-fitting problem and the inductive problem of predicting future outcomes from observed data. Less obviously, Schulte (1999) argues for a connection between induction and ontological parsimony. Schulte frames the problem of induction in information-theoretic terms: given a data-stream of observations of non-unicorns (for example), what general conclusion should be drawn? He argues for two constraints on potential rules. First, the rule should converge on the truth in the long run (so if no unicorns exist then it should yield this conclusion). Second, the rule should minimize the maximum number of changes of hypothesis, given different possible future observations. Schulte argues that the ‘Occam Rule’—conjecture that Ω does not exist until it has been detected in an experiment—is optimal relative to these constraints. An alternative rule—for example, conjecturing that Ω exists until 1 million negative results have been obtained—may result in two changes of hypothesis if, say, Ω's are not detected until the 2 millionth experiment. The Occam Rule leads to at most one change of hypothesis (when an Ω is first detected). (See also Kelly 2004, 2007.) Schulte (2008) applies this approach to the problem of discovering conservation laws in particle physics. The analysis has been criticized by Fitzpatrick (2013), who raises doubts about why long-run convergence to the truth should matter when it comes to predicting the outcome of the very next experiment.

With respect to the justification question, arguments have been made in both directions. Scientists are often inclined to justify simplicity principles on broadly inductive grounds. According to this argument, scientists select new hypotheses based partly on criteria that have been generated inductively from previous cases of theory choice. Choosing the most parsimonious of the acceptable alternative hypotheses has tended to work in the past. Hence scientists continue to use this as a rule of thumb, and are justified in so doing on inductive grounds. One might try to bolster this point of view by considering a counterfactual world in which all the fundamental constituents of the universe exist in pairs. In such a ‘pairwise’ world, scientists might well prefer pairwise hypotheses in general to their more parsimonious rivals. This line of argument has a couple of significant weaknesses. Firstly, one might legitimately wonder just how successful the choice of parsimonious hypotheses has been; examples from chemistry spring to mind, such as oxygen molecules containing two atoms rather than one. Secondly, and more importantly, there remains the issue of explaining why the preference for parsimonious hypotheses in science has been as successful as it has been.

Making the justificatory argument in the reverse direction, from simplicity to induction, has a strong historical precedent in philosophical approaches to the problem of induction, from Hume onwards. Justifying the ‘straight rule’ of induction by appeal to some general Principle of Uniformity is an initially appealing response to the skeptical challenge. However, in the absence of a defense of the underlying Principle itself (and one which does not, on pain of circularity, depend inductively on past success), it is unclear how much progress this represents. There have also been attempts (see e.g. Steel 2009) to use simplicity considerations to respond to Nelson Goodman's ‘new riddle of induction.’

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  • Zellner, A., Keuzenkamp, H. & McAleer, M. (eds.), 2001, Simplicity, Inference and Modelling: Keeping It Sophisticatedly Simple , Cambridge: Cambridge University Press.
How to cite this entry . Preview the PDF version of this entry at the Friends of the SEP Society . Look up this entry topic at the Indiana Philosophy Ontology Project (InPhO). Enhanced bibliography for this entry at PhilPapers , with links to its database.

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  • David Dowe's Occam's Razor links (Computer Science, Monash University)

[Please contact author with other suggestions.]

computability and complexity | induction: problem of | learning theory, formal | logic: inductive | naturalism | Ockham [Occam], William

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Divine Simplicity

Other essays.

Simplicity means God is not made up of parts; he is not composite or a compounded being. He is simple; all that is in God is God.

God is not made up of parts, nor is he compounded or composite in nature. That means he does not possess attributes, as if his attributes are one thing and his essence another. Rather, his essence is his attributes and his attributes his essence. God is his attributes. That means, all that is in God simply is God. Simplicity is key for it distinguishes between the infinite, eternal, and immutable Creator and the finite, temporal, and mutable creature. Simplicity is rejected by some philosophers and theologians today but is affirmed by the Great Tradition and Protestant confessions. Most importantly, it is assumed throughout scripture whenever God is identified in the strongest sense with his attributes and is inferred in scripture’s affirmation of divine immutability and eternity and aseity.

Introduction

Back during my seminary days, our family lived in Louisville, Kentucky. One of the advantages of living in Louisville was the occasional trip to Homemade Pie and Ice Cream, which had the most scrumptious pies in town. Each year people from all over the country, even the world, travel to Louisville for the famous Kentucky Derby. Before the race, the festivities are not only marked by flamboyant hats and mint juleps, but most bakeries will sell out of their Derby pie, a mouth-watering chocolate and walnut tart pie no one can resist. I enjoy a classic Derby pie, but there is one pie I enjoy even more: the award-winning Dutch apple caramel pie. As you can tell, I like the Dutch; there will be no shortage of quotes in this book from the Dutch Reformed theologian Herman Bavinck. I don’t know if Bavinck ate a Dutch apple caramel pie in his day, but (humor me) I can think of nothing better than sitting next to a garden of tulips, with Bavinck’s Reformed Dogmatics in one hand and a piece of Dutch apple caramel pie in the other. I know, I know—the things theologians dream about.

Truth be told, the caramel on the pie is so thick (too thick for the taste buds of some) that you need a butcher’s knife to cut through it. But let’s say you’ve found your knife and you begin dividing up the pie: a fairly large piece for me, thank you, and perhaps smaller pieces for everyone else. It kills me to admit this, because a theologian is always looking for an insightful illustration wherever he can find one, but Dutch apple caramel pie is a poor illustration for what God is like. That’s right, a really bad one. And yet it’s how many people think about God’s attributes. In fact, it’s what makes me nervous when I write one chapter after another on different attributes of God, as if we’re slicing up the pie called “God.”

The perfections of God are not like a pie, as if we sliced up the pie into different pieces, love being ten percent, holiness fifteen percent, omnipotence seven percent, and so on. Unfortunately, this is how many Christians talk about God today, as if love, holiness, omnipotence were all different parts of God, God being evenly divided among his various attributes. Some even go further, believing some attributes to be more important than others. This happens most with divine love, which some say is the most important attribute (the biggest piece of the pie).

But as I point out in None Greater: The Undomesticated Attributes of God , such an approach is deeply problematic, turning God into a collection of attributes. It even sounds as if God were one thing and his attributes another, something added onto him, attached to who he is. Not only does this approach divide up the essence of God, but it potentially risks setting one part of God against another (for example, might his love ever oppose his justice?). Sometimes this error is understandable; it unintentionally slips into our God-talk. We might say, “God has love” or “God possesses all power.” We all understand what is being communicated, but the language can be misleading. It would be far better to say, “God is love” or “God is all-powerful.” By tweaking our language, we are protecting the unity of God’s essence. To do so is to guard the “simplicity” of God.

Simplicity and the Wisdom of the A-Team

Simplicity may be a new concept to your theological vocabulary, but it is one that has been affirmed by the majority of our Christian forebears over the past two thousand years of church history, even by some of the earliest church fathers. And for good reason, too. Let’s consult the A-team: Augustine, Anselm, and Aquinas.

Apparently, I am not the only one who has appealed to an illustration to demonstrate what God is not like. In the fifth century, the church father Augustine did the same, though it wasn’t Dutch apple caramel pie. Instead, Augustine appealed to liquid, the human body, and sunshine. The nature of the Trinity is called simple, because “it cannot lose any attribute it possesses,” and because “there is no difference between what it is and what it has, as there is, for example, between a vessel [cup] and the liquid it contains, a body and its colour, the atmosphere and its light or heat, the soul and its wisdom.” Augustine concludes, “None of these is what it contains.” 1 A cup and liquid, a body and its color, the atmosphere and its light or heat, the soul and its wisdom—what do these all have in common? Answer: division.

Not so, however, with God and his attributes.

God’s attributes are not external to his essence, as if they added a quality to him that he would not otherwise possess. It’s not as if there were attributes that were accidental to God, capable of being added or subtracted, lost and then found, as if they did not even have to exist in the first place. Rather, God is his attributes. Instead of addition and division, there is absolute unity. His essence is his attributes, and his attributes, his essence. Or as Augustine says, “God has no properties but is pure essence…. They neither differ from his essence nor do they differ materially from each other.” 2

Augustine is not alone. Take Anselm, for example. If something is “composed of parts,” he remarks, then it cannot be “altogether one.” Whenever there is a plurality of parts, that which is made up of those parts is vulnerable to being dissolved. How disastrous this would be for God! By contrast, God is “truly a unitary being,” one who is “identical with” himself and “indivisible.” “Life and wisdom and the other [attributes], then, are not parts of You, but all are one and each one of them is wholly what You are and what all the others are.” 3

Or consider Thomas Aquinas. Since God does not have a body (like us), he “is not composed of extended parts,” as if he were composed of “form and matter.” It’s not as if God were something different from “his own nature.” Nor is it the case that his nature is one thing and his existence another thing. We shouldn’t suppose, either, that God is some type of substance, one that has accidents, traits that can be disposed of or cease to exist. “God is in no way composite. Rather, he is entirely simple.” 4

Wholly, wholly, wholly is the Lord: Singular Perfection

While Aquinas uses the words “composite” and “composition” to explain what God is not , the church father Irenaeus uses the word “compound” to explain what God is not . If something is compounded, it means it has more than one part to it, each part being separate from the other. By contrast, God, being simple, is an “uncompounded Being,” not having different “members.” He is totally “equal to himself.” Perhaps it’s appropriate, then, to put the word “wholly” in front of each of his attributes to emphasize this very point. “God is not as men are,” explains Irenaeus. “For the Father of all is at a vast distance from those affections and passions which operate among men. He is a simple, uncompounded Being, without diverse members, and altogether like, and equal to Himself, since he is wholly understanding, and wholly spirit, and wholly thought, and wholly intelligence, and wholly reason … wholly light, and the whole source of all that is good.” 5

With the A-team by our side it is appropriate to conclude that simplicity is not merely a negative statement—God is without parts—but a positive one as well: God is identical with all that he is in and of himself. In the purest sense, God is one; he is singular perfection.

In Scripture, this cannot be said of the gods made by humans, gods composed of parts. Given how unique God is, then, it is only right that God’s people confess together, as does Israel, that “the Lord our God, the Lord is one” (Deut 6:4).

How Serious Is a Denial of Simplicity?

The denial of simplicity is serious. So serious that one apologist has said it is “tantamount to atheism.” 6 That sounds extreme. Yet up until the nineteenth century, most would have agreed.

Unfortunately, too many Christians today have adopted monopolytheism—that is, the belief that there is one God, but he looks a lot like the gods of mythology, possessing human attributes, only in greater measure. If monopolytheism were true, however, then God not only would be made up of various parts or properties but would be “logically dependent on some more comprehensive reality embracing both him and other beings.” 7

Of course, to say that God is not personal the way the finite gods of paganism are personal is not to say that God is impersonal: he is infinite, sovereign, simple, and personal. The latter attribute surfaces in many biblical texts, but it must be protected from assumptions dragged in from the world of finite gods, lest God’s matchless simplicity be jeopardized.

Point is, if God were dependent on something or someone else, then he would have given up his deity altogether, for whatever he would be dependent on would have to be something than which nothing greater can be conceived, something more comprehensive than himself.

That is serious.

In the end, simplicity is an attribute simply too serious to ignore.

Ideas or content in this article adapted from None Greater have been used with permission from Baker Books.

Further Reading

  • Matthew Barrett, None Greater: The Undomesticated Attributes of God
  • Matthew Barrett, Credo Podcast: The undomesticated attributes of God, part 1
  • Matthew Barrett, Credo Podcast: The undomesticated attributes of God, part 2
  • Matthew Barrett with James Dolezal, Credo Podcast: What is simplicity and does it matter?
  • Matthew Barrett, “ Simplicity ,” Midwestern Seminary

This essay is part of the Concise Theology series. All views expressed in this essay are those of the author. This essay is freely available under Creative Commons License with Attribution-ShareAlike, allowing users to share it in other mediums/formats and adapt/translate the content as long as an attribution link, indication of changes, and the same Creative Commons License applies to that material.

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The narrative structure: a tale of simplicity and complexity, character development: from innocence to wisdom, portrayal of historical events: a tapestry of american history, conclusion: a timeless tale of love, resilience, and humanity.

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COMMENTS

  1. Simplicity Definition, Synonyms, Importance

    Definition. Simplicity is . a textual attribute, an element of style, that describes a style of writing that is as straightforward and uncomplicated as possible given the complexity of the topic, the writer's aims, and the complexities of the rhetorical situation.; the art of minimizing unnecessary complexities in both language and structure to ensure that the intended message is transmitted ...

  2. Simplicity

    Syntactic simplicity, or elegance, measures the number and conciseness of the theory's basic principles. Ontological simplicity, or parsimony, measures the number of kinds of entities postulated by the theory. One issue concerns how these two forms of simplicity relate to one another.

  3. What is Simplicity?: Exploring the Meaning and Significance

    Simplicity provides a unique path to more. In a world that often glorifies complexity and busyness, embracing simplicity is a powerful act of rebellion in a way. It's a conscious choice to prioritize what truly matters and to find clear meaning in the uncomplicated. Simplicity allows us to connect with others on a deeper level, to communicate ...

  4. Simplicity is the Ultimate Sophistication

    "Simplicity is the ultimate sophistication," encapsulates a profound truth that transcends time and resonates with the essence of human nature. This essay explores the multifaceted significance of simplicity, delving into its manifestations across various aspects of life and its enduring impact on individuals, societies, and even creativity.

  5. Simplicity: a Quality of Extraordinary People

    Simplicity is always associated with humility, and it implies magnanimity and maturity. That's why, though it might seem counter-intuitive, only extraordinary people genuinely have this quality. Some people define simplicity as "a celebration of the little things.". In other words, a simple person is capable of enjoying and appreciating ...

  6. Ten Words on Simplicity in Writing and Life

    Here I boil down Foster's ten ideas for simplicity and tie them to Strunk & White's timeless lessons on writing. 1. Usefulness. Foster says, "Buy things for their usefulness rather than their status." His example about clothes is poignant: "Stop trying to impress people with your clothes and impress them with your life."

  7. Simplicity

    Simplicity is the state or quality of being simple.Something easy to understand or explain seems simple, in contrast to something complicated. Alternatively, as Herbert A. Simon suggests, something is simple or complex depending on the way we choose to describe it. In some uses, the label "simplicity" can imply beauty, purity, or clarity.In other cases, the term may suggest a lack of nuance or ...

  8. Simplicity > Notes (Stanford Encyclopedia of Philosophy)

    Notes to Simplicity. 1. Compare Poincaré's remark that "simplicity is a vague notion" and "everyone calls simple what he finds easy to understand, according to his habits." (quoted in Gauch [2003, p. 275]) 2. N.B. some philosophers use the term 'semantic simplicity' for this second category. e.g. Sober [2001, p. 14]

  9. Simplicity Definition & Meaning

    simplicity: [noun] the state of being simple, uncomplicated, or uncompounded.

  10. Simplicity in Life: The Value of Simple Living

    With simplicity in life, it can be easier to recognize what is truly important among all the different things fighting for your time and attention. The biggest benefits of simple living are: Lower cost of living. More free time. Less stress. Sustainable (smaller footprint) Better concentration. Better sleep.

  11. simplicity, n. meanings, etymology and more

    What does the noun simplicity mean? There are 13 meanings listed in OED's entry for the noun simplicity, three of which are labelled obsolete. See 'Meaning & use' for definitions, usage, and quotation evidence. See meaning & use. How common is the noun simplicity?

  12. Simplicity Is The Essence Of Beauty Essay

    The dictionary defines simplicity as 'The quality or condition of being plain or uncomplicated in form and design'. An artist however may define it as 'visual economy'. This essay explores the concept of 'visual economy', or 'simplicity' as 'the essence of beauty'. However, to understand this we also need to examine how the ...

  13. SIMPLICITY

    SIMPLICITY definition: 1. the fact that something is easy to understand or do: 2. the fact that something is ordinary…. Learn more.

  14. 227 Words Short Essay on Simplicity

    Simplicity is a great virtue which one can observe in life. We are rightly advised by the wise elders to believe in simple living and high thinking. We should observe simplicity in our food habits. We should take simple but nourishing food. If we are children, we should take milk, butter, bread, vegetables, curd, cheese […]

  15. SIMPLICITY

    SIMPLICITY meaning: 1. the fact that something is easy to understand or do: 2. the fact that something is ordinary…. Learn more.

  16. simplicity noun

    Definition of simplicity noun in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

  17. Simplicity (Stanford Encyclopedia of Philosophy/Fall 2017 Edition)

    Syntactic simplicity, or elegance, measures the number and conciseness of the theory's basic principles. Ontological simplicity, or parsimony, measures the number of kinds of entities postulated by the theory. One issue concerns how these two forms of simplicity relate to one another.

  18. Simplicity Definition & Meaning

    Britannica Dictionary definition of SIMPLICITY. 1. [noncount] : the quality of being easy to understand or use. People like the simplicity of the instructions/camera. For simplicity's sake [=to make it simpler and easier], we have rounded off the numbers to the nearest whole number. = We have rounded off the numbers for the sake of simplicity. 2.

  19. SIMPLICITY definition in American English

    Definition of 'simplicity' ... Share. ×. Credits. ×. simplicity (sɪmpl ɪ sɪti) uncountable noun. The simplicity of something is the fact that it is not complicated and can be understood or done easily. The apparent simplicity of his plot is deceptive. ... or tips on writing the perfect college essay, Harper Reference has you covered for ...

  20. Divine Simplicity

    Definition . Simplicity means God is not made up of parts; he is not composite or a compounded being. He is simple; all that is in God is God. Summary . ... This essay is part of the Concise Theology series. All views expressed in this essay are those of the author. This essay is freely available under Creative Commons License with Attribution ...

  21. Forrest Gump: an Unforgettable Journey Through History

    Definition Essays; Descriptive Essay; Evaluation Essays; Exemplification Essays; Exploratory Essays; Expository Essays; ... and provide a profound commentary on the human condition. By embracing the simplicity and complexity of life, the film reminds us of the importance of love, resilience, and the power of our actions to shape history. Keep ...

  22. Simplexity

    Simplexity. Simplexity is a neologism which proposes a possible complementary relationship between complexity and simplicity . One of the first formally published instances of the word was in the journal 'Childhood Education' (1924), in the article it appears to be used to discuss education and psychology related issues. [1]