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" "You, Socrates, began by saying that virtue can't be taught, and now you are insisting on the opposite, trying to show that all things are knowledge, justice, soundness of mind, even courage, from which it would follow that virtue most certainly can be taught.
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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