I have written this letter to you on a happy day to me, which is also the last day of my life. For I have been attacked by a painful inability to urinate, and also dysentery, so violent that nothing can be added to the violence of my sufferings. But the cheerfulness of my mind, which comes from the recollection of all my philosophical contemplation, counterbalances all these afflictions. And I beg you to take care of the children of Metrodorus, in a manner worthy of the devotion shown by the young man to me, and to philosophy.
In Dialogues concerning Natural Religion (1779), David Hume also attributes the argument to Epicurus:
According to Diskin Clay, Epicurus himself established a custom of celebrating his birthday annually with Common meals, befitting his stature as heros ktistes ("founding hero") of the Garden. He ordained in his will annual memorial feasts for himself on the same date (10th of Gamelion month). Epicurean communities continued this tradition, referring to Epicurus as their "saviour" (soter) and celebrating him as hero. Lucretius apotheosized Epicurus as the main character of his epic poem De rerum natura. The hero cult of Epicurus may have operated as a Garden variety civic religion. However, clear evidence of an Epicurean hero cult, as well as the cult itself, seems buried by the weight of posthumous philosophical interpretation. Epicurus' cheerful demeanour, as he continued to work despite dying from a painful stone blockage of his urinary tract lasting a fortnight, according to his successor Hermarchus and reported by his biographer Diogenes Laërtius, further enhanced his status among his followers.
In Greece, in February of every year since 2011 a two-day Panhellenic Symposium of Epicurean Philosophy is held.
But the Epicureans did have 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)
For Epicurus, the purpose of philosophy was to attain the happy, tranquil life, characterized by ataraxia—peace and freedom from fear—and aponia—the absence of pain—and by living a self-sufficient life surrounded by friends. He taught that the root of all human neurosis was death denial, and the tendency for human beings to assume that death will be horrific and painful, which he claimed causes unnecessary anxiety, selfish self-protective behaviors, and hypocrisy. According to Epicurus, death is the end of both the body and the soul and therefore should not be feared. He also taught that the gods neither reward nor punish humans; that the universe is infinite and eternal; and that occurrences in the natural world are ultimately the result of atoms moving and interacting in empty space.