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When he heard me say this, he replied: No other inference, Socrates, can be drawn from your words.

I proceeded: Is not a Sophist, Hippocrates, one who deals wholesale or retail in the food of the soul? To me that appears to be his nature.

And what, Socrates, is the food of the soul?

Surely, I said, 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: neither do their customers know, with the exception of any trainer or physician who may happen to buy of them. In like manner those who carry about the wares of knowledge, and make the round of the cities, and sell or retail them to any customer who is in want of them, praise them all alike; though I should not wonder, O my friend, if many of them were really ignorant of their effect upon the soul; and their customers equally ignorant, unless he who buys of them happens to be a physician of the soul. If, therefore, you have understanding of what is good and evil, you may safely buy knowledge of Protagoras or of any one; but if not, then, O my friend, pause, and do not hazard your dearest interests at a game of chance. For there is far greater peril in buying knowledge than in buying meat and drink: the one you purchase of the wholesale or retail dealer, and carry them away in other vessels, and before you receive them into the body as food, you may deposit them at home and call in any experienced friend who knows what is good to be eaten or drunken, and what not, and how much, and when; and then the danger of purchasing them is not so great. But you cannot buy the wares of knowledge and carry them away in another vessel; when you have paid for them you must receive them into the soul and go your way, either greatly harmed or greatly benefited; and therefore we should deliberate and take counsel with our elders; for we are still young—too young to determine such a matter. And now let us go, as we were intending, and hear Protagoras; and when we have heard what he has to say, we may take counsel of others; for not only is Protagoras at the house of Callias, but there is Hippias of Elis, and, if I am not mistaken, Prodicus of Ceos, and several other wise men.