Heraclitus (c. 535 – 475 BCE)
A pre-Socratic philosopher from Ephesus who emphasized constant change in the universe. Thus his most famous saying: "No man ever steps in the same river twice."

1. Miletus said everything was made of water; Anaximenes said it was made of air (or vapour); and Heraclitus said it was fire.

2. He also said "Panta rhei" — everything is in a state of flux, i.e., in a state of continual change and decay.
Categories: people presocratics

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