“Knowledge is the food of the soul; and we must take care, my friend, that the Sophist does not deceive us when he praises what he sells, like the dealers wholesale or retail who sell the food of the body; for they praise indiscriminately all their goods, without knowing what are really beneficial or hurtful.”

—  Plato, book Protagoras

313c, Benjamin Jowett, trans.
Protagoras

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Classical Greek philosopher -427–-347 BC

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