Key Pages on EpicurusToday.com
This page provides a guide to the most important content on EpicurusToday.com, organized by section. Each entry includes a brief description of what the page covers and why it matters. For new visitors, the Welcome page and the Key Concepts pages are the best starting points. For those ready to go deeper, the Physics, Canonics, and Ethics Analysis sections contain the most detailed content on the site.
Introduction
Section titled “Introduction”The gateway page for the entire site, providing a comprehensive introduction to Epicurean philosophy and its three foundational branches: physics (the nature of things), canonics (the nature of knowledge), and ethics (the nature of the good life). The page includes a full statement of the fifteen core principles of Epicurean philosophy with links to detailed reference pages, a discussion of the four traditions — Stoicism, Platonism, supernatural religion, and Humanism — that have historically distorted the reception of Epicurus, and plain-language explanations of the most important doctrines including the Epicurean treatment of the gods, death, fate, virtue, and pleasure. New visitors should start here.
Physics Analysis
Section titled “Physics Analysis”Physics — The Continuing Vitality of the Epicurean Approach
Section titled “Physics — The Continuing Vitality of the Epicurean Approach”The main analytical article on Epicurean physics, examining how the foundational doctrines established in the Letter to Herodotus — nothing comes from nothing, the universe is atoms and void, matter and space are eternal — hold up against both ancient objections and modern science. The article addresses the Epicurean approach to multiple explanations of natural phenomena, the Le Sage corpuscular theory of gravity as an example of an Epicurean-consistent hypothesis that modern physicists have not fully dismissed, and the way that Epicurean physics functions as a set of guardrails against specific philosophical errors rather than a claim to have all the answers. This is one of the foundational analytical articles on the site.
Let All Who Would Free Themselves From the False Claims of the Geometers Enter Here
Section titled “Let All Who Would Free Themselves From the False Claims of the Geometers Enter Here”An analysis of Epicurus’s systematic rejection of the foundational objects of Euclidean geometry — points without dimension, lines without width, infinitely divisible continua — and his alternative doctrine of minimum parts as the smallest physically real unit of spatial extension. The article traces the Epicurean objection from the canonical standard (abstract geometric entities cannot be observed and therefore cannot constitute genuine knowledge of physical reality) through the ancient debate involving Polyaenus and the mathematicians of Cyzicus, and shows how Bishop Berkeley’s The Analyst and modern physics’ concept of the Planck length both independently vindicate the Epicurean position. It draws primarily on David Sedley’s scholarship and the ancient sources in the Bailey translations.
An examination of the Epicurean rejection of philosophical idealism in its various forms — the claim that the real world is in some sense mental, abstract, or constituted by ideas rather than by physical matter. The article addresses the canonical grounds on which Epicurus insisted that the physical world experienced through sensation is the only real world, and shows how this rejection applies to Platonic idealism, to the Stoic doctrine of the divine rational order, and to modern descendants of these positions. The Epicurean account of the relationship between the mind and the physical world is presented as a coherent and consistent alternative to idealist frameworks.
Epicurean Responses to the Intelligent Design Argument
Section titled “Epicurean Responses to the Intelligent Design Argument”A comprehensive historical and philosophical analysis of the intelligent design argument from its origins in Pre-Socratic philosophy (Anaxagoras, Diogenes of Apollonia) through Socrates, Plato’s Timaeus, Aristotle’s unmoved mover, and the Stoic doctrine of divine providence — and of the systematic Epicurean refutation on logical, canonical, physical, and ethical grounds. The article shows how Epicurus addressed each form of the argument, how Lucretius developed a proto-selectionist account of biological organization that anticipates Darwin, and why the Epicurean response remains as relevant to modern forms of the design argument — including the fine-tuning argument and molecular-level irreducible complexity claims — as it was to the ancient ones. The ethical dimension receives particular attention: the article argues that the intelligent design argument has always functioned as a mechanism of moral control, and that Epicurus’s systematic refutation was specifically aimed at dismantling that mechanism.
Truth and Reality Does Not Require Being Eternally The Same
Section titled “Truth and Reality Does Not Require Being Eternally The Same”An analysis of the Epicurean rejection of the Platonic and Stoic requirement that genuine reality must be eternal, unchanging, and incorruptible. This page addresses the argument — central to Plato’s Republic and to Stoic natural theology — that anything subject to change, decay, or impermanence cannot be genuinely real or genuinely good, and shows why Epicurus rejected this requirement as false to the nature of things as sensation and experience establish them. The article has direct implications for understanding why Epicurus treated pleasure — which is always impermanent — as the genuine highest good, against the Platonic and Stoic objection that something impermanent cannot be a complete or final good.
A detailed examination of Aristotle’s systematic philosophical critique of Democritean atomism — centered on his arguments about continuity, contact, and motion in Physics Book VI and De Generatione et Corruptione — and of the precise way in which Epicurus responded to each objection through his doctrine of minimum parts. The article shows that Epicurus accepted the conclusions Aristotle’s arguments forced on him (including the quantization of atomic motion and the necessity of minimum spatial units) while rejecting Aristotle’s conclusion that infinite divisibility follows from the nature of continuous magnitude. It draws on the scholarship of David Furley, David Konstan, and Gregory Vlastos.
Canonics Analysis
Section titled “Canonics Analysis”Canonics — A Human Standard of Knowledge (Introduction)
Section titled “Canonics — A Human Standard of Knowledge (Introduction)”An introductory overview of Epicurean canonics — the theory of how genuine knowledge is possible and what its sources are — suitable for readers coming to this topic for the first time. The page introduces the three criteria of truth that Epicurus established (sensation, anticipations, and feelings of pleasure and pain), explains why Epicurus rejected both radical skepticism and the rationalist claim that pure reason can access truths independent of experience, and sets up the more detailed analysis in the companion article. The treatment of why canonics is foundational to everything else in Epicurean philosophy — physics and ethics both depend on a sound account of how we know anything — is given particular attention.
Canonics — Knowledge for the Only Real World
Section titled “Canonics — Knowledge for the Only Real World”The main analytical article on Epicurean epistemology, examining in depth how the three criteria of truth operate, why all sensations are held to be true (while judgments about sensations can be false), and how the canonical standard functions as a guardrail against specific philosophical errors throughout the Epicurean system. The article addresses the Epicurean rejection of Academic Skepticism, the relationship between canonics and physics, and the specific application of the canonical standard to claims about unobservable entities — including the atoms, the gods, and the abstract mathematical objects that the geometers article treats separately. It draws on David Sedley’s scholarship on Epicurean anti-reductionism and on A.A. Long and D.N. Sedley’s The Hellenistic Philosophers.
A structured comparison of the Epicurean, Platonic, Aristotelian, and Stoic accounts of how knowledge is possible and what its sources are, presented in a format that allows the key differences to be seen at a glance. The chart covers the primary criteria of truth recognized by each school, their treatment of sensation and reason as sources of knowledge, their positions on the reliability of the senses, and their accounts of how general concepts are formed. This is a useful reference for readers who want to understand the philosophical context of the Epicurean position without reading through extended argument.
Ethics Analysis
Section titled “Ethics Analysis”Ethics — The Intelligent Pursuit of Pleasure (Introduction)
Section titled “Ethics — The Intelligent Pursuit of Pleasure (Introduction)”An introductory overview of Epicurean ethics and why the identification of pleasure as the goal of life is a philosophically serious and well-grounded position rather than the crude hedonism that hostile ancient and modern commentators have portrayed. The page introduces the foundational Epicurean claim that Nature has provided every living creature with pleasure and pain as its natural guides, surveys the main doctrines of Epicurean ethics, and explains the relationship between pleasure as the goal, reason as the instrument, and virtue as the most important set of tools for achieving genuine happiness. Suitable for readers new to Epicurean ethics.
The Epicurean Goal Is Happiness Through Pleasure — Not Ataraxia
Section titled “The Epicurean Goal Is Happiness Through Pleasure — Not Ataraxia”A direct analysis of the most consequential single mistake in modern readings of Epicurean philosophy: the substitution of the Greek word ataraxia (freedom from mental disturbance, or tranquility) for happiness and pleasure as the Epicurean goal of life. The article works through the Letter to Menoeceus to show that happiness is named as the destination from the first sentence, that pleasure is explicitly identified as the beginning and end of the blessed life, and that ataraxia appears in its correct position as a feature of the pleasured mind rather than the goal that replaces pleasure. The three cultural filters responsible for the misreading — Stoicism, religious tradition, and Humanism — are identified and analyzed. The article features a prominent treatment of the Oinoanda inscription of Diogenes, whose Fragment 32 — “I say both now and always, shouting out loudly to all Greeks and non-Greeks, that pleasure is the end of the best mode of life” — is the most direct ancient refutation of the misreading.
An analysis of how Epicurus used the concept of happiness and why it is the correct translation of the Greek eudaimonia as Epicurus employed it — a life in which pleasures predominate over pains across the full range of experience, not the narrower concept of happiness as a momentary emotional state. The page examines the relationship between happiness as the goal, pleasure as the standard by which it is measured, and the practical implications of understanding happiness in Epicurean terms: that it is genuinely available to everyone, that it does not depend on extraordinary fortune or unusual circumstances, and that the foundation required for it is accessible throughout life.
The Perfect and the Good — An Epicurean View of Their Relationship
Section titled “The Perfect and the Good — An Epicurean View of Their Relationship”An analysis of when the aspiration toward perfection serves the good life and when it undermines it — a question that runs through Epicurean ethics in multiple practical contexts. The article identifies four distinct forms of the “perfect as enemy of the good” problem (paralysis, depreciation, perfectionist exhaustion, and false dichotomy), then shows how Epicurus navigated between them using the divine model as an inspiring aspiration without making it a tyrannical demand. Specific applications include the Epicurean gods as models of the best possible life, Vatican Saying 32 on the benefits of reverencing the sage, the dangers of searching for a perfect spouse rather than committing to a good one, the person who abandons the pursuit of knowledge because it cannot be perfect, and the person who cannot appreciate a finite life because it is not eternal. The article draws on the Vatican Sayings and on Torquatus in Cicero’s On Ends.
An examination of Torquatus’s description in On Ends Book I of how the Epicurean wise man maintains a state of genuine happiness through the use of memory, philosophical understanding, and the active appreciation of present goods — even in the face of physical pain or difficult circumstances. The article draws on Torquatus’s key passage at On Ends I.62, on Epicurus’s own deathbed letter to Idomeneus as a practical demonstration of the principle, and on the Letter to Menoeceus’s account of how philosophical practice produces continuous happiness. The treatment of why this happiness is genuine rather than forced is given particular attention.
Epicurean Ethics — Head and Heart Study Guide
Section titled “Epicurean Ethics — Head and Heart Study Guide”A six-week study guide for exploring Epicurean ethics, structured around the parallel between the head (physics and canonics as the rational foundation) and the heart (the emotional and practical dimensions of the pleasurable life) — a parallel drawn from Thomas Jefferson’s famous Head and Heart letter. The guide moves through the major topics of Epicurean ethics in a sequence designed to build understanding progressively, with each week’s material grounded in primary ancient texts. It is suitable for individual study or for structured group discussion at EpicureanFriends.com.
Epicurean Ethics — Head and Heart Teachers Guide
Section titled “Epicurean Ethics — Head and Heart Teachers Guide”The companion guide for facilitators leading groups through the six-week Head and Heart curriculum, providing discussion questions, background context, and guidance on how to address the most common points of confusion or resistance that arise in each section. The Teachers Guide draws on the accumulated experience of the EpicureanFriends community in presenting Epicurean philosophy to new participants, and includes specific advice on handling the questions about pleasure, virtue, the gods, and death that are most likely to generate productive discussion.
Guilty As Charged — Ciceronian Deceit in Attacking Epicurean Pleasure
Section titled “Guilty As Charged — Ciceronian Deceit in Attacking Epicurean Pleasure”An analysis of one of Cicero’s most effective rhetorical attacks on Epicurus — the charge in On Ends Book I that Epicurus’s framework cannot account for the pleasures of intellectual activity, literature, history, and philosophy — showing how the charge is refuted by Epicurus’s own texts (especially Letter to Herodotus sections 37 and 78, where Epicurus says he finds his own peace chiefly in the investigation of nature, and that happiness depends on it), by what Torquatus says in the very dialogue in which Cicero levels the charge, and by evidence from Cicero’s own other writings. The article draws on Norman DeWitt’s verdict that Cicero was a “crafty trial lawyer” who argued to make points rather than to reveal truth, and confirms that verdict by examining the evidence Cicero himself provided but could not suppress.
An analysis of the Epicurean doctrine that the removal of pain is the gateway to the fullest possible pleasurable life, using the image of a gate that, once burst open, reveals everything beyond it. The article works through Principal Doctrine 3 and its relationship to Principal Doctrines 1 and 2, showing how the “limit of pleasure” doctrine is a specific response to the Platonic argument that pleasure cannot be the highest good because it has no limit, rather than a claim that absence of pain is the whole content of the good life. The examples of Torquatus and Cassius Longinus — Epicureans who lived fully engaged lives rather than retiring from the world — are used to show what authentic Epicurean practice looks like.
Two Names for One Reality — Why Absence of Pain and Pleasure Are Interchangeable Terms
Section titled “Two Names for One Reality — Why Absence of Pain and Pleasure Are Interchangeable Terms”An analysis of the Epicurean argument that “absence of pain” and “pleasure” are not two different things but two descriptions of the same condition — that there are only two internal states available to a living creature (pleasure and pain), and that the presence of one entails the absence of the other. The article draws on Principal Doctrine 3, the Letter to Menoeceus, and Torquatus’s exchanges with Cicero in On Ends Books I and II, and addresses Cicero’s persistent objection that Epicurus was making a verbal error by calling two different things by one name. It connects to the companion articles on The Full Cup Model and The Norm Is Pleasure Too.
An analysis of the Epicurean model of the complete pleasurable life as a cup that is full — not the still water of a passive undisturbed mind, but a life actively crammed with genuine pleasures of body and mind, in a condition as free from anxiety and pain as wisdom and circumstances allow. The article develops the philosophical context in which this model emerges: Plato’s argument in the Philebus that pleasure cannot be the highest good because it has no limit, and Epicurus’s response through Principal Doctrines 3 and 4 that pleasure does have a limit (the point where all pain has been displaced) and that at that limit it is complete and cannot be increased in magnitude, only varied in content. The article includes an analysis of how the first four Principal Doctrines form a systematic series of responses to the three most powerful ancient arguments against pleasure as the goal of life.
An analysis of Epicurus’s foundational claim that the normal state of a living creature — when pain is absent but no external stimulus is present — is genuinely and fully pleasurable, not a neutral zero waiting to be filled. The article is structured around Norman DeWitt’s three claims about why this extension of the term “pleasure” to the normal state is justified: that the name ought to be applied to it, that reason justifies the application, and that human beings are happier for understanding and accepting it. It draws on Diogenes Laertius’s report of the two-sensation doctrine (pleasure and pain as the only two internal states), on Torquatus in On Ends I.38 and I.62, and on Aulus Gellius’s analysis of how expressing the positive through the negation of its contrary was a standard Greek literary pattern that Epicurus was using rather than inventing.
The Epicurean Account of Justice vs. Platonism, Stoicism, Humanism, and Libertarianism
Section titled “The Epicurean Account of Justice vs. Platonism, Stoicism, Humanism, and Libertarianism”A comprehensive analysis of the Epicurean theory of justice as developed in Principal Doctrines 31 through 38, and of the four major traditions it directly opposes. The article makes particular emphasis on the frequently misread conditional character of Epicurean justice: when circumstances change and a compact is no longer mutually beneficial, it is no longer just — which means that exiting such an arrangement is natural rather than unjust. It contrasts this with Cicero’s Republic formulation of natural law as eternal and unchangeable, Plato’s account of justice as an eternal Form, Stoic divine rational order, Humanist universal dignity theory, and Libertarian Non-Aggression Principle and Randian categorical self-interest — showing how all four share the same fundamental structure of abstract obligation that Epicurus’s account is designed to replace. The article also draws on Aoiz and Boeri’s Theory and Practice in Epicurean Political Philosophy for the analysis of security as a positive good, the natural preconception of justice, and the Ring of Gyges challenge.
Not a Bunker But a Camp — On Engagement With Society
Section titled “Not a Bunker But a Camp — On Engagement With Society”An analysis of the Epicurean approach to engagement with the broader world, arguing against the stereotype of the Epicurean as someone who withdraws into a private garden and avoids all public and political life. The article examines the ancient evidence for Epicurean political and civic engagement, including the historical examples of Epicurean figures who were actively involved in public life, and shows that the Epicurean counsel of selective withdrawal from unnecessary entanglements is quite different from a counsel of wholesale disengagement. The relationship between security (as a genuine component of the pleasurable life) and the political conditions that make security possible is given particular attention.
Other Analysis
Section titled “Other Analysis”A collection of the questions most commonly asked about Epicurean philosophy by new readers, with carefully documented answers drawn from the primary ancient texts. The questions range from foundational matters (“Does Epicurus really teach that pleasure is the highest good?”) to common misconceptions (“Didn’t Epicurus live on bread and water?”) to specific philosophical challenges (“How can Epicurus believe in gods and also reject divine providence?”). Each answer is grounded in Epicurus’s own words where possible, with citations to the relevant texts. This is a good starting point for readers who have specific questions before committing to the longer analytical articles.
A systematic commentary on the Principal Doctrines and Vatican Sayings of Epicurus, providing context, explanation, and cross-references for each of the forty Principal Doctrines and the collection of Vatican Sayings. The commentary draws on the scholarship assembled at EpicureanFriends.com over many years of discussion and analysis, and is intended to help readers understand not only what each doctrine says but why it was stated the way it was, what philosophical challenge it was addressing, and how it fits into the broader system. This is a useful companion to the primary texts themselves.
Leaders of the Major Philosophical Schools
Section titled “Leaders of the Major Philosophical Schools”A reference page providing an overview of the major ancient philosophical schools — Epicurean, Platonic/Academic, Stoic, Peripatetic/Aristotelian, Cyrenaic, and others — with brief accounts of the key figures in each school and their most important contributions. The page provides the historical and philosophical context needed to understand the relationships and debates among the schools, including who Epicurus was responding to, who was responding to him, and how the different schools positioned themselves against each other. It includes a chronological overview of the major figures across the relevant period.
An examination of the physical and social location of Epicurus’s Garden in Athens, arguing against the misreading of the Garden as a place of withdrawal from the city and from public life. The page shows that the Garden was located within the city, that Epicurus and his associates were actively engaged with the intellectual and social world around them, and that the Epicurean counsel to avoid certain kinds of political entanglement was quite different from a counsel to retreat from human society altogether. The analysis of what “live unnoticed” actually meant in context — as advice about unnecessary political ambition rather than about social engagement generally — is central to the article.
An examination of the false beliefs and irrational fears that Epicurean philosophy identifies as the primary sources of unnecessary human suffering — what the article calls “mind viruses” — and of how the Epicurean therapeutic approach addresses each one. The page covers the fear of divine punishment, the terror of death, belief in fate and the absence of genuine freedom, radical skepticism about the possibility of knowledge, and several others. For each false belief, the article identifies the Epicurean diagnosis, the relevant primary texts that address it, and the philosophical remedy the Epicurean tradition prescribes. The framing of philosophical error as a kind of infection that can be identified and treated is drawn from Epicurus’s own use of medical analogy in describing the purpose of philosophy.
An analysis of Epicurean philosophy as a resource for people navigating difficult personal or social circumstances, with particular attention to the ancient and modern misreadings that have turned Epicurus from a vigorous life-affirming philosopher into an advocate of passive withdrawal. The article addresses the specific kinds of troubled circumstances in which Epicurean philosophy has historically proven most valuable — including political instability, personal loss, and the confrontation with mortality — and shows how the Epicurean combination of materialist confidence (no supernatural punishment), freedom from the fear of death, and the priority of genuine friendship provides resources that no tradition of passive resignation can match.
A study of two prominent ancient Romans with documented Epicurean commitments who lived full, active, and politically engaged lives — specifically Cassius Longinus and other Epicurean figures from the Roman military and political world. The article uses these historical examples to refute the stereotype of the Epicurean as an apolitical recluse, showing that the most thoroughly Epicurean figures in Roman history were people of vigorous engagement with the world around them, whose Epicurean commitments shaped how they acted in the world rather than causing them to withdraw from it. Cassius Longinus’s letter to Cicero during the Roman Civil War, preserved by Cicero himself, is a central document.
A collection and analysis of the polemical attacks that Epicurus and his school directed against competing philosophical traditions — the Platonists, Stoics, Skeptics, and Cyrenaics. The page documents Epicurus’s sometimes fierce rhetorical style, including his famous dismissals of Plato, Aristotle, and Socrates, and places this polemical tradition in its proper philosophical context: Epicurus was not merely being rude, but was identifying what he considered to be genuine philosophical errors with serious practical consequences. The article also provides useful context for understanding why ancient commentators often described Epicurus as arrogant, and why the Epicurean tradition of vigorous polemic can be distinguished from mere personal insult.
Epicurus in the Modern World — What Non-Epicureans Need to Know
Section titled “Epicurus in the Modern World — What Non-Epicureans Need to Know”An analysis of how Epicurean philosophy relates to the most common modern philosophical and religious frameworks, with specific attention to what adherents of those frameworks need to understand about Epicurus if they are to engage with his philosophy honestly. The page addresses Stoics (who tend to read Epicurus as a kind of failed Stoic), Humanists (who tend to domesticate Epicurus by ignoring his rejection of abstract universal obligations), people with religious commitments (who must come to terms with the Epicurean rejection of divine providence and afterlife), Buddhists (who share some superficial features with Epicurus but whose goal of liberation from desire is radically different from the Epicurean full cup of pleasure), and Libertarians (who find surface agreement but miss the fundamental difference between a categorical principle and a natural guide). The article is both a guide for newcomers from these traditions and a resource for Epicureans who discuss philosophy with people from them.
Primary Text References
Section titled “Primary Text References”A presentation of the key Epicurean texts preserved in Diogenes Laertius’s Lives of the Eminent Philosophers Book X — including the full texts of the Letter to Herodotus, the Letter to Pythocles, the Letter to Menoeceus, and the Principal Doctrines — in a side-by-side format that allows comparison across different translations. This is the primary ancient source for the surviving Epicurean texts, and this presentation makes it easy to compare how different translators have rendered key passages, particularly on contested terms like “pleasure,” “tranquility,” and “blessed.”
A presentation of key passages from Lucretius’s De Rerum Natura (On the Nature of Things) in a side-by-side format allowing comparison across translations. Lucretius’s poem is the most complete and most eloquent ancient exposition of Epicurean physics, and this page makes it easy to compare different English renderings of the passages most important for understanding Epicurean philosophy, including the opening hymn to nature, the arguments for atomic structure and void, the treatment of death and the soul, and the account of the natural development of human society in Book V.
A comprehensive topical outline of key Epicurean quotations from across the ancient sources — Epicurus’s letters and doctrines, Lucretius, Cicero’s Epicurean speakers, Diogenes of Oinoanda, and others — organized by topic and presented in a format that allows quick navigation by subject. This is the most useful single reference page on the site for finding what the ancient sources say about any particular aspect of Epicurean philosophy. Topics covered include the nature of the gods, death, pleasure, virtue, friendship, justice, knowledge, and many others.
The same comprehensive collection of key Epicurean quotations as the Chart View, presented in a hierarchical outline format rather than a chart. Some readers find the outline format easier to navigate for extended reading, while the chart format is more useful for quick reference. Both pages cover the same material.
An interactive chart comparing the positions of Epicurean, Platonic/Socratic, Aristotelian, and Stoic philosophy across the major questions of ancient philosophy — the nature of reality, the criterion of knowledge, the goal of life, the nature of the gods, the treatment of death, the status of virtue, and others. The chart allows readers to see at a glance both where the schools agree and where they differ, and to understand the specific character of the Epicurean position relative to each of its major ancient competitors. Available in both light and dark modes.
An interactive questionnaire that helps readers determine whether their existing philosophical commitments align with Epicurean philosophy, and if so, where. The questionnaire works through the core Epicurean positions — on the nature of the universe, the possibility of knowledge, the goal of life, and the treatment of the gods and death — asking readers to compare the Epicurean view with the Platonic, Stoic, and Aristotelian alternatives and identify which they find most compelling. Readers who find themselves in agreement with the Epicurean positions are directed to further resources for study and discussion at EpicureanFriends.com.
This page was last updated April 30, 2026. If you find a description that does not match the current content of a page, please report it in the EpicureanFriends forum.