Born: 540 B.C. Died: 480 B.C.
Heraclitus of Ephesus was a Presocratic Greek philosopher from Ephesus in Asia Minor. As with other Presocratics, his writings only survive in fragments quoted by other authors. He disagreed with Thales, Anaximander, and Pythagoras about the nature of the ultimate substance and claimed instead that everything is derived from the Greek classical element fire, rather than from air, water, or earth. This led to the belief that change is real, and stability illusory. For Heraclitus everything is "in flux", as exemplified in his famous aphorism "Everything flows, nothing stands still." He appears to have taught by means of small, oracular aphorisms meant to encourage thinking based on natural law and reason. The brevity and elliptical logic of his aphorisms earned Heraclitus the epithet 'Obscure'. (Source)
