[ Thanks to tetris4
for this link. ]
“ANTIPHON: I believe that you are a fair man. I do not
consider you wise, though. I even think that you know this
yourself, since you do not receive any money for your teaching.
Your clothes, however, or your house, or any other of your
possessions, which you think that may be of value, you would not
give it for free or for a lower price than what
it’s worth. It is, thus, obvious that if you
consider your teaching of value, you should have been receiving
some money. You might therefore be fair, because you do not deceive
anybody out of greed, but you cannot be wise because you know
things with no value.”