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"The past is certain, the future obscure."

Thales of Miletus

"I know that I know nothing."

Socrates

"The measure of a man is what he does with power."

Plato

"Do not say a little in many words but a great deal in a few."

Pythagoras

"πάντα ῥεῖ (panta rhei) - everything flows"

Heraclitus of Ephesos

"Nothing exists except atoms and empty space; everything else is opinion."

Democritus

"The whole is more than the sum of its parts."

Aristotle