Ancient Greek philosophy
Epicureanism

Epicurus studied in Athens with Nausiphanes, who was a follower of Democritus and a student of Pyrrho of Elis. He accepted Democritus' theory of atomism, with improvements made in response to criticisms by Aristotle and others. His ethics were based on "the pursuit of pleasure and the avoidance of pain". This was, however, not simple hedonism, as he noted that "We do not mean the pleasures of the prodigal or of sensuality... we mean the absence of pain in the body and trouble in the mind".
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