Epicureanism is the ancient school most consistently misrepresented by its opponents, and the one whose political theory turned out to be the most modern.
Its physics is atomist, taken from Democritus: nothing exists but atoms and void, the soul is material and disperses at death, and the gods, if they exist, take no interest in us. From this comes the therapeutic aim. Fear of the gods and fear of death are the two great sources of human misery, and both rest on mistakes about nature. Remove them and what remains is achievable: ataraxia, freedom from disturbance. The pleasure Epicurus recommended was this absence of pain, not indulgence; he lived on bread and water and thought a cup of wine an occasion.
The politics is contractual and deflationary. Justice is not written into the cosmos and is not owed to the gods. It is an agreement neither to harm nor be harmed, entered into because it is useful, and binding only while it remains so. That makes Epicurus a genuine ancestor of the social contract, and one who dispenses with the natural-law scaffolding the Stoics supplied. His advice was to live unnoticed and stay out of public life, which is a political position rather than an absence of one.
Lucretius turned the doctrine into Latin verse in De Rerum Natura, and the poem's rediscovery in 1417 put materialism back into European circulation. Gassendi Christianized it, Hobbes absorbed the physics, and the utilitarians took the calculus of pleasure and pain and made it a public standard rather than a private discipline.
