Heraclitus [her-uh-klahy-tuhs] (535 – 475 BCE) was a pre-Socratic Greek philosopher, a native of the Greek city Ephesus, Ionia, on the what is now the Turkish coast of the Aegean Sea. He was of distinguished parentage. Little is known about his early life and education, but he regarded himself as self-taught and a pioneer of wisdom. From the lonely life he led, and still more from the riddling nature of his philosophy and his contempt for humankind in general, he was called ‘The Obscure,’ and the ‘Weeping Philosopher.’
Heraclitus is famous for his doctrine of change being central to the universe, as stated in his famous saying, ‘You cannot step twice into the same stream.’ He believed in the unity of opposites, stating that ‘the path up and down are one and the same,’ existing things being characterized by pairs of contrary properties, and other explorations of the concept of dualism.



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