Epicurus
Epicurus (, EH-pih-KURE-əs; Ancient Greek: Ἐπίκουρος Epikouros; 341–270 BC) was an ancient Greek philosopher who founded Epicureanism, a highly influential school of philosophy; which taught that management of one's desires, removal of unnecessary fears (summarized in the Tetrapharmakos below), friendship, and virtuous living led to a pleasant life and constant happiness, the highest good. Epicureans also were generally evangelical, as seen by later followers like Diogenes of Oenoanda and Lucretius and were known for their missionary nature, including carrying around pamphlets for any potential convert.
Epicurus advocated that people were best able to pursue philosophy by living a self-sufficient life surrounded by friends; he and his followers were known for eating simple meals and discussing a wide range of philosophical subjects at "The Garden", the school he established in Athens. Epicurus taught that although the gods exist, they have no involvement in human affairs. Like the earlier philosopher Democritus, Epicurus claimed that all occurrences in the natural world are ultimately the result of tiny, invisible particles known as atoms moving and interacting in empty space, though...
Definition from Wikipedia – Epicurus