trans. Jowett (1871)
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.
To this we agreed, and proceeded on our way until we reached the vestibule of the house; and there we stopped in order to conclude a discussion which had arisen between us as we were going along; and we stood talking in the vestibule until we had finished and come to an understanding. And I think that the doorkeeper, who was a eunuch, and who was probably annoyed at the great inroad of the Sophists, must have heard us talking. At any rate, when we knocked at the door, and he opened and saw us, he grumbled: They are Sophists -he is not at home; and instantly gave the door a hearty bang with both his hands. Again we knocked, and he answered without opening: Did you not hear me say that he is not at home, fellows? But, my friend, I said, you need not be alarmed; for we are not Sophists, and we are not come to see Callias, but we want to see Protagoras; and I must request you to announce us. At last, after a good deal of difficulty, the man was persuaded to open the door.