SOCRATES: And can they teach the better who are unable to teach the worse?
ALCIBIADES: I think that they can; at any rate, they can teach many far better things than to play at draughts.
SOCRATES: What things?
ALCIBIADES: Why, for example, I learned to speak Greek of them, and I cannot say who was my teacher, or to whom I am to attribute my knowledge of Greek, if not to those good-for-nothing teachers, as you call them.
SOCRATES: Why, yes, my friend; and the many are good enough teachers of Greek, and some of their instructions in that line may be justly praised.
ALCIBIADES: Why is that?
SOCRATES: Why, because they have the qualities which good teachers ought to have.
ALCIBIADES: What qualities?
SOCRATES: Why, you know that knowledge is the first qualification of any teacher?
ALCIBIADES: Certainly.