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" "Man is the measure of all things: of things which are, that they are, and of things which are not, that they are not.
Protagoras (c. 481 BC – c. 420 BC) was an ancient Greek philosopher. He was a pre-Socratic philosopher and is numbered as one of the sophists by Plato, who in his dialogue of the same name credits him with having invented the role of the professional sophist or teacher of "virtue".
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