Editing Epicurus (section)

==Philosophy==
{{main|Epicureanism}}
[[File:Epicurus - portrait for a library, Colosseum.jpg|thumb|upright|Bronze bust of Epicurus from [[Herculaneum]]. Three Epicurus bronze busts were recovered from the [[Villa of the Papyri]], as well as text fragments.<ref>{{Cite book|url=https://books.google.com/books?id=2fFa42_0Gb0C&q=Velia%20parmenides&pg=PA45|title=Ancient Greek Portrait Sculpture: Contexts, Subjects, and Styles|year=2006|publisher=Cambridge University Press|author=Sheila Dillon|page=45 |via=Google Books|isbn=9780521854986}}</ref>]]

===Epistemology===
Epicurus and his followers had a well-developed [[epistemology]], which developed as a result of their rivalry with other philosophical schools.{{sfn|Strodach|2012|page=26}}{{sfn|Asmis|1984|pages=9–13}} Epicurus wrote a treatise entitled {{lang|grc|[[:wikt:κανών|Κανών]]}}, or ''Rule'', in which he explained his methods of investigation and theory of knowledge.{{sfn|Asmis|1984|pages=10, 19}} This book, however, has not survived,{{sfn|Asmis|1984|pages=10, 19}} nor does any other text that fully and clearly explains Epicurean epistemology, leaving only mentions of this epistemology by several authors to reconstruct it.{{sfn|Strodach|2012|page=26}}{{sfn|Asmis|1984|pages=9–13}}  Epicurus rejected the Platonic idea of "Reason" as a reliable source of knowledge about the world apart from the senses{{sfn|DeWitt|1976|page=10}} and was bitterly opposed to the [[Pyrrhonism|Pyrrhonists]] and [[Academic Skepticism|Academic Skeptics]], who not only questioned the ability of the senses to provide accurate knowledge about the world, but also whether it is even possible to know anything about the world at all.{{sfn|Strodach|2012|page=23}}

Epicurus maintained that the senses never deceive humans, but that the senses can be misinterpreted.{{sfn|Strodach|2012|pages=23–24}}{{sfn|Asmis|1984|page=11}} Epicurus held that the purpose of all knowledge is to aid humans in attaining ''ataraxia''.{{sfn|Strodach|2012|pages=26–27}}{{sfn|Asmis|1984|page=12}} He taught that knowledge is learned through experiences rather than innate{{sfn|Strodach|2012|pages=27–28}} and that the acceptance of the fundamental truth of the things a person perceives is essential to a person's moral and spiritual health.{{sfn|Strodach|2012|pages=28–29}}{{sfn|Asmis|1984|page=12}} In the ''Letter to Pythocles'', he states, "If a person fights the clear evidence of his senses he will never be able to share in genuine tranquility."{{sfn|Strodach|2012|page=29}} Epicurus regarded gut feelings as the ultimate authority on matters of morality and held that whether a person feels an action is right or wrong is a far more cogent guide to whether that act really is right or wrong than abstracts maxims, strict codified rules of ethics, or even reason itself.{{sfn|Strodach|2012|pages=30–31}}

Epicurus believed that any statement that is not directly contrary to human perception can be considered possibly true.{{sfn|Strodach|2012|pages=32–34}} On the other hand, anything contrary to experience can be ruled out as false.{{sfn|Strodach|2012|page=34}} Epicureans often used analogies to everyday experience to support their argument of so-called "imperceptibles", which included anything that a human being cannot perceive, such as the motion of atoms.{{sfn|Strodach|2012|pages=34–35}} In line with this principle of non-contradiction, the Epicureans believed that events in the natural world may have multiple causes that are all equally possible and probable.{{sfn|Strodach|2012|pages=35–39}} Lucretius writes in ''On the Nature of Things'', as translated by William Ellery Leonard:
<blockquote><poem>There be, besides, some thing
Of which 'tis not enough one only cause
To state—but rather several, whereof one
Will be the true: lo, if thou shouldst espy
Lying afar some fellow's lifeless corse,
'Twere meet to name all causes of a death,
That cause of his death might thereby be named:
For prove thou mayst he perished not by steel,
By cold, nor even by poison nor disease,
Yet somewhat of this sort hath come to him
We know—And thus we have to say the same
In divers cases.<ref>{{cite book |last=Carus |first=Titus Lucretius |title=Of The Nature of Things |others=William Ellery Leonard (translator) |publisher=Project Gutenberg |series=Project Gutenberg EBook |volume=785 |url=http://www.gutenberg.org/cache/epub/785/pg785.txt |date=Jul 2008 }}
Book VI, Section ''Extraordinary and Paradoxical Telluric Phenomena'', Line 9549–9560</ref></poem></blockquote>
Epicurus strongly favored naturalistic explanations over theological ones.{{sfn|Strodach|2012|pages=36–38}} In his ''Letter to Pythocles'', he offers four different possible natural explanations for thunder, six different possible natural explanations for lightning, three for snow, three for comets, two for rainbows, two for earthquakes, and so on.{{sfn|Strodach|2012|page=38}} Although all of these explanations are now known to be false, they were an important step in the history of science, because Epicurus was trying to explain natural phenomena using natural explanations, rather than resorting to inventing elaborate stories about gods and mythic heroes.{{sfn|Strodach|2012|page=38}}

===Ethics===
[[File:Museum of Side 029.jpg|thumb|Marble relief from the first or second century showing the mythical transgressor [[Ixion]] being tortured on a spinning fiery wheel in [[Tartarus]]. Epicurus taught that stories of such punishment in the afterlife are ridiculous superstitions and that believing in them prevents people from attaining ''ataraxia''.{{sfn|Strodach|2012|pages=56–58}}{{sfn|Kenny|2004|page=94}}]]

Epicurus was a [[Hedonism|hedonist]], meaning he taught that what is pleasurable is morally good and what is painful is morally evil.{{sfn|Strodach|2012|page=58}}{{sfn|Barnes|1986|page=372}}{{sfn|Kenny|2004|page=95}}{{sfn|Gordon|2012|page=3}} He idiosyncratically defined "pleasure" as the absence of suffering{{sfn|Barnes|1986|page=372}}{{sfn|Gordon|2012|page=3}} and taught that all humans should seek to attain the state of ''[[ataraxia]]'', meaning "untroubledness", a state in which the person is completely free from all pain or suffering.{{sfn|Barnes|1986|page=371}}<ref name=folse/><ref name=konstan/> He argued that most of the suffering which human beings experience is caused by the irrational fears of death, [[divine retribution]], and punishment in the afterlife.{{sfn|Strodach|2012|pages=56–58}}{{sfn|Kenny|2004|page=94}} In his ''Letter to Menoeceus'', Epicurus explains that people seek wealth and power on account of these fears, believing that having more money, prestige, or political clout will save them from death.{{sfn|Strodach|2012|pages=56–58}}{{sfn|Kenny|2004|page=94}} He, however, maintains that death is the end of existence, that the terrifying stories of punishment in the afterlife are ridiculous superstitions, and that death is therefore nothing to be feared.{{sfn|Strodach|2012|pages=56–58}}{{sfn|Kenny|2004|page=94}}{{sfn|Gordon|2012|pages=3–4}} He writes in his ''Letter to Menoeceus'': "Accustom thyself to believe that death is nothing to us, for good and evil imply sentience, and death is the privation of all sentience;... Death, therefore, the most awful of evils, is nothing to us, seeing that, when we are, death is not come, and, when death is come, we are not."{{sfn|Rosenbaum|2004|page=175}} From this doctrine arose the Epicurean epitaph: ''Non fui, fui, non-sum, non-curo'' ("I was not; I was; I am not; I do not care"), which is inscribed on the gravestones of his followers and seen on many ancient gravestones of the [[Roman Empire]]. This quotation is often used today at [[humanism|humanist]] funerals.<ref name=humanism>{{cite web |url=http://www.humanism.org.uk/humanism/humanist-tradition/ancient-world/epicurus |title=Epicurus (c 341-270 BC) |publisher=British Humanist Association }}</ref>

The [[Tetrapharmakos]] presents a summary of the key points of Epicurean ethics:<ref>{{cite book
 | last =Hutchinson
 | first =D. S. (Introduction)
 | title =The Epicurus Reader: Selected Writings and Testimonia
 | publisher =Hackett
 | location=Cambridge
 | year =1994
 | page =vi
}}</ref>

* Don't fear god
* Don't worry about death
* What is good is easy to get
* What is terrible is easy to endure

Although Epicurus has been commonly misunderstood as an advocate of the rampant pursuit of pleasure, he, in fact, maintained that a person can only be happy and free from suffering by living wisely, soberly, and morally.{{sfn|Barnes|1986|page=372}}{{sfn|Strodach|2012|pages=58–60}}{{sfn|Gordon|2012|pages=5–7}} He strongly disapproved of raw, excessive sensuality and warned that a person must take into account whether the consequences of his actions will result in suffering,{{sfn|Barnes|1986|page=372}}{{sfn|Strodach|2012|page=59}}{{sfn|Kenny|2004|page=95}}{{sfn|Gordon|2012|pages=5–7}} writing, "the pleasant life is produced not by a string of drinking bouts and revelries, nor by the enjoyment of boys and women, nor by fish and the other items on an expensive menu, but by sober reasoning."{{sfn|Barnes|1986|page=372}} He also wrote that a single good piece of cheese could be equally pleasing as an entire feast.{{sfn|Kenny|2004|page=95}}{{sfn|Gordon|2013|page=141}} Furthermore, Epicurus taught that "it is not possible to live pleasurably without living sensibly and nobly and justly", because a person who engages in acts of dishonesty or injustice will be "loaded with troubles" on account of his own guilty conscience and will live in constant fear that his wrongdoings will be discovered by others.{{sfn|Barnes|1986|page=372}}{{sfn|Strodach|2012|pages=58–59}}<ref name=classics/> A person who is kind and just to others, however, will have no fear and will be more likely to attain ''ataraxia''.{{sfn|Barnes|1986|page=372}}{{sfn|Strodach|2012|pages=58–59}}

Epicurus distinguished between two different types of pleasure: "moving" pleasures (κατὰ κίνησιν ἡδοναί) and "static" pleasures (καταστηματικαὶ ἡδοναί).<ref name=IEP>{{cite web| url = http://www.iep.utm.edu/epicur/| title = Epicurus {{!}} Internet Encyclopedia of Philosophy}}</ref><ref name=laerti>[[Diogenes Laërtius]], ''The Lives and Opinions of Eminent Philosophers'', X:136.</ref> "Moving" pleasures occur when one is in the process of satisfying a desire and involve an active titillation of the senses.<ref name=IEP/> After one's desires have been satisfied (e.g. when one is full after eating), the pleasure quickly goes away and the suffering of wanting to fulfill the desire again returns.<ref name=IEP/>{{sfn|Kenny|2004|pages=95–96}} For Epicurus, static pleasures are the best pleasures because moving pleasures are always bound up with pain.<ref name=IEP/>{{sfn|Kenny|2004|pages=95–96}} Epicurus had a low opinion of sex and marriage, regarding both as having dubious value.{{sfn|Gordon|2012|page=4}} Instead, he maintained that platonic friendships are essential to living a happy life.{{sfn|Gordon|2012|pages=4–5}} One of the ''Principal Doctrines'' states, "Of the things wisdom acquires for the blessedness of life as a whole, far the greatest is the possession of friendship."<ref>Epicurus, ''Principal Doctrines'' 27</ref>{{sfn|Gordon|2012|page=5}} He also taught that philosophy is itself a pleasure to engage in.{{sfn|Gordon|2012|pages=4–5}} One of the quotes from Epicurus recorded in the ''Vatican Sayings'' declares, "In other pursuits, the hard-won fruit comes at the end. But in philosophy, delight keeps pace with knowledge. It is not after the lesson that enjoyment comes: learning and enjoyment happen at the same time."<ref>Epicurus, ''Vatican Sayings'' 27</ref>{{sfn|Gordon|2012|page=5}}

Epicurus distinguishes between three types of desires: natural and necessary, natural but unnecessary, and vain and empty. Natural and necessary desires include the desires for food and shelter. These are easy to satisfy, difficult to eliminate, bring pleasure when satisfied, and are naturally limited. Going beyond these limits produces unnecessary desires, such as the desire for luxury foods. Although food is necessary, luxury food is not necessary. Correspondingly, Epicurus advocates a life of hedonistic moderation by reducing desire, thus eliminating the unhappiness caused by unfulfilled desires. Vain desires include desires for power, wealth, and fame. These are difficult to satisfy because no matter how much one gets, one can always want more. These desires are inculcated by society and by false beliefs about what we need. They are not natural and are to be shunned.<ref>{{Cite web|url=https://www.iep.utm.edu/epicur/#SH5c|title=Epicurus &#124; Internet Encyclopedia of Philosophy}}</ref>

Epicurus' teachings were introduced into medical philosophy and practice by the Epicurean doctor [[Asclepiades of Bithynia]], who was the first physician who introduced Greek medicine in Rome. Asclepiades introduced the friendly, sympathetic, pleasing and painless treatment of patients. He advocated humane treatment of mental disorders, had insane persons freed from confinement and treated them with natural therapy, such as diet and massages. His teachings are surprisingly modern; therefore Asclepiades is considered to be a pioneer physician in psychotherapy, physical therapy and molecular medicine.<ref name=yapij/>

===Physics===
Epicurus writes in his ''[[Letter to Herodotus]]'' (not the historian)<ref>{{cite web |last1=Naragon |first1=S |title=Letter to Herodotus |url=https://users.manchester.edu/Facstaff/SSNaragon/Online/texts/316/Epicurus,%20LetterHerodotus.pdf |website=manchester.edu |publisher=Manchester University, Indiana |access-date=13 June 2021}}</ref> that "[[Creatio ex materia|nothing ever arises from the nonexistent]]", indicating that all events therefore have causes, regardless of whether those causes are known or unknown.{{sfn|Strodach|2012|pages=8–9}} Similarly, he also writes that nothing ever passes away into nothingness, because, "if an object that passes from our view were completely annihilated, everything in the world would have perished, since that into which things were dissipated would be nonexistent."{{sfn|Strodach|2012|page=10}} He therefore states: "The totality of things was always just as it is at present and will always remain the same because there is nothing into which it can change, inasmuch as there is nothing outside the totality that could intrude and effect change."{{sfn|Strodach|2012|page=10}} Like Democritus before him, Epicurus taught that all [[matter]] is entirely made of extremely tiny particles called "[[atom]]s" ({{langx|grc|[[:wikt:ἄτομος|ἄτομος]]}}; ''{{lang|grc-Latn|atomos}}'', meaning "indivisible").{{sfn|Strodach|2012|pages=1–8, 11}} For Epicurus and his followers, the existence of atoms was a matter of empirical observation;{{sfn|Strodach|2012|page=11}} Epicurus's devoted follower, the Roman poet [[Lucretius]], cites the gradual wearing down of rings from being worn, statues from being kissed, stones from being dripped on by water, and roads from being walked on in ''On the Nature of Things'' as evidence for the existence of atoms as tiny, imperceptible particles.{{sfn|Strodach|2012|page=11}}

Also like Democritus, Epicurus was a [[materialism|materialist]] who taught that the only things that exist are atoms and void.{{sfn|Strodach|2012|pages=12–13}}{{sfn|Wasson|2016}} Void occurs in any place where there are no atoms.{{sfn|Strodach|2012|pages=12}} Epicurus and his followers believed that atoms and void are both infinite and that the universe is therefore boundless.{{sfn|Strodach|2012|page=13}} In ''On the Nature of Things'', Lucretius argues this point using the example of a man throwing a javelin at the theoretical boundary of a finite universe.{{sfn|Strodach|2012|pages=13–14}} He states that the javelin must either go past the edge of the universe, in which case it is not really a boundary, or it must be blocked by something and prevented from continuing its path, but, if that happens, then the object blocking it must be outside the confines of the universe.{{sfn|Strodach|2012|pages=13–14}} As a result of this belief that the universe and the number of atoms in it are infinite, Epicurus and the Epicureans believed that there must also be [[multiverse|infinitely many worlds]] within the universe.{{sfn|Strodach|2012|pages=14–15}}

Epicurus taught that the motion of atoms is constant, eternal, and without beginning or end.{{sfn|Strodach|2012|page=15}} He held that there are two kinds of motion: the motion of atoms and the motion of visible objects.{{sfn|Strodach|2012|page=15}} Both kinds of motion are real and not illusory.{{sfn|Strodach|2012|pages=15–16}} Democritus had described atoms as not only eternally moving, but also eternally flying through space, colliding, coalescing, and separating from each other as necessary.{{sfn|Strodach|2012|page=16}} In a rare departure from Democritus's physics, Epicurus posited the idea of [[clinamen|atomic "swerve"]] ({{lang|grc|[[:wikt:παρέγκλισις|παρέγκλισις]]}} ''{{lang|grc-Latn|parénklisis}}''; {{langx|la|[[clinamen]]}}), one of his best-known original ideas.{{sfn|Strodach|2012|pages=16–17}}{{efn|The only fragment in Greek about this central notion is from the Oenoanda inscription (fr. 54 in Smith's edition). The best known reference is in Lucretius's ''On the Nature of Things'', [https://www.perseus.tufts.edu/hopper/text?docLucr.+ 2.251].}} According to this idea, atoms, as they are travelling through space, may deviate slightly from the course they would ordinarily be expected to follow.{{sfn|Strodach|2012|pages=16–17}} Epicurus's reason for introducing this doctrine was because he wanted to preserve the concepts of [[free will]] and ethical responsibility while still maintaining the [[determinism|deterministic]] physical model of atomism.{{sfn|Strodach|2012|pages=17–18}} Lucretius describes it, saying, "It is this slight deviation of primal bodies, at indeterminate times and places, which keeps the mind as such from experiencing an inner compulsion in doing everything it does and from being forced to endure and suffer like a captive in chains."{{sfn|Strodach|2012|page=18}}

Epicurus was first to assert human freedom as a result of the fundamental [[indeterminism]] in the motion of atoms. This has led some philosophers to think that, for Epicurus, free will was ''caused directly by chance''. In his ''On the Nature of Things'', [[Lucretius]] appears to suggest this in the best-known passage on Epicurus' position.<ref name=tufts/> In his ''Letter to Menoeceus'', however, Epicurus follows Aristotle and clearly identifies ''three'' possible causes: "some things happen of necessity, others by chance, others through our own agency." Aristotle said some things "depend on us" (''eph'hemin''). Epicurus agreed, and said it is to these last things that [[praise]] and [[blame]] naturally attach. For Epicurus, the "swerve" of the atoms simply defeated [[determinism]] to leave room for autonomous agency.<ref name=infop/>

===Theology===
[[File:Iphigeneia sacrificed MAN Napoli Inv9112.jpg|thumb|upright=1.3|First-century AD Roman fresco from [[Pompeii]], showing the mythical [[human sacrifice]] of [[Iphigenia]], daughter of [[Agamemnon]]. Epicurus's devoted follower, the Roman poet [[Lucretius]], cited this myth as an example of the evils of popular religion, in contrast to the more wholesome theology advocated by Epicurus.{{sfn|Strodach|2012|pages=46–47}}]]

In his ''Letter to Menoeceus'', a summary of his own moral and theological teachings, the first piece of advice Epicurus himself gives to his student is: "First, believe that a god is an indestructible and blessed animal, in accordance with the general conception of god commonly held, and do not ascribe to god anything foreign to his indestructibility or repugnant to his blessedness."{{sfn|Hickson|2014|pages=27}} Epicurus maintained that he and his followers knew that the gods exist because "our knowledge of them is a matter of clear and distinct perception", meaning that people can empirically sense their presences.{{sfn|Strodach|2012|page=39}} He did not mean that people can see the gods as physical objects, but rather that they can see visions of the gods sent from the remote regions of interstellar space in which they actually reside.{{sfn|Strodach|2012|page=39}} According to George K. Strodach, Epicurus could have easily dispensed of the gods entirely without greatly altering his materialist worldview,{{sfn|Strodach|2012|page=39}} but the gods still play one important function in Epicurus's theology as the paragons of moral virtue to be emulated and admired.{{sfn|Strodach|2012|page=39}}

Epicurus rejected the conventional Greek view of the gods as anthropomorphic beings who walked the earth like ordinary people, fathered illegitimate offspring with mortals, and pursued personal feuds.{{sfn|Strodach|2012|page=39}} Instead, he taught that the gods are morally perfect, but detached and immobile beings who live in the remote regions of interstellar space.{{sfn|Strodach|2012|pages=39–40}} In line with these teachings, Epicurus adamantly rejected the idea that deities were involved in human affairs in any way.{{sfn|Hickson|2014|pages=27}}{{sfn|Strodach|2012|pages=42–43}} Epicurus maintained that the gods are so utterly perfect and removed from the world that they are incapable of listening to prayers or supplications or doing virtually anything aside from contemplating their own perfections.{{sfn|Strodach|2012|pages=39–40}} In his ''Letter to Herodotus'', he specifically denies that the gods have any control over natural phenomena, arguing that this would contradict their fundamental nature, which is perfect, because any kind of worldly involvement would tarnish their perfection.{{sfn|Strodach|2012|pages=42–43}} He further warned that believing that the gods control natural phenomena would only mislead people into believing the superstitious view that the gods punish humans for wrongdoing, which only instills fear and prevents people from attaining ''ataraxia''.{{sfn|Strodach|2012|pages=42–43}}

Epicurus himself criticizes popular religion in both his ''Letter to Menoeceus'' and his ''Letter to Herodotus'', but in a restrained and moderate tone.{{sfn|Strodach|2012|pages=45–46}} Later Epicureans mainly followed the same ideas as Epicurus, believing in the existence of the gods, but emphatically rejecting the idea of divine providence.{{sfn|Hickson|2014|pages=27}} Their criticisms of popular religion, however, are often less gentle than those of Epicurus himself.{{sfn|Strodach|2012|page=46}} The ''Letter to Pythocles'', written by a later Epicurean, is dismissive and contemptuous towards popular religion{{sfn|Strodach|2012|page=46}} and Epicurus's devoted follower, the Roman poet [[Lucretius]] ({{circa}} 99 BC – {{circa}} 55 BC), passionately assailed popular religion in his philosophical poem ''[[De rerum natura|On the Nature of Things]]''.{{sfn|Strodach|2012|page=46}} In this poem, Lucretius declares that popular religious practices not only do not instill virtue, but rather result in "misdeeds both wicked and ungodly", citing the mythical sacrifice of [[Iphigenia]] as an example.{{sfn|Strodach|2012|pages=46–47}} Lucretius argues that divine creation and providence are illogical, not because the gods do not exist, but rather because these notions are incompatible with the Epicurean principles of the gods' indestructibility and blessedness.{{sfn|Hickson|2014|pages=27–28}}{{sfn|Strodach|2012|pages=43–45}} The later [[Pyrrhonism|Pyrrhonist]] philosopher [[Sextus Empiricus]] ({{circa}} 160 – {{circa}} 210 AD) rejected the teachings of the Epicureans specifically because he regarded them as theological "Dogmaticists".{{sfn|Hickson|2014|page=28}}

===Politics===
Epicurus promoted an innovative theory of justice as a social contract. Justice, Epicurus said, is an agreement neither to harm nor be harmed, and we need to have such a contract in order to enjoy fully the benefits of living together in a well-ordered society. Laws and punishments are needed to keep misguided fools in line who would otherwise break the contract. But the wise person sees the usefulness of justice, and because of his limited desires, he has no need to engage in the conduct prohibited by the laws in any case. Laws that are useful for promoting happiness are just, but those that are not useful are not just. (''Principal Doctrines'' 31–40)

Epicurus discouraged participation in politics, as doing so leads to perturbation and status seeking. He instead advocated not drawing attention to oneself. This principle is epitomised by the phrase ''lathe biōsas'' ({{lang|grc|λάθε βιώσας}}), meaning "live in obscurity", "get through life without drawing attention to yourself", i.e., live without pursuing glory or wealth or power, but anonymously, enjoying little things like food, the company of friends, etc. [[Plutarch]] elaborated on this theme in his essay ''Is the Saying "Live in Obscurity" Right?'' ({{lang|grc|Εἰ καλῶς εἴρηται τὸ λάθε βιώσας}}, ''An recte dictum sit latenter esse vivendum'') 1128c; cf. [[Flavius Philostratus]], ''Vita Apollonii'' 8.28.12.<ref>{{Cite web|url=https://www.livius.org/sources/content/philostratus-life-of-apollonius/philostratus-life-of-apollonius-8.26-31/#8.28|title = Philostratus, Life of Apollonius 8.26-31 - Livius}}</ref>