euthydemus   

tell us the number, and we count them, and you are found to be right,
we will believe the rest. They fancied that Ctesippus was making game
of them, and they refused, and they would only say in answer to each
of his questions, that they knew all things. For at last Ctesippus
began to throw off all restraint; no question in fact was too bad for
him; he would ask them if they knew the foulest things, and they, like
wild boars, came rushing on his blows, and fearlessly replied that
they did. At last, Crito, I too was carried away by my incredulity,
and asked Euthydemus whether Dionysodorus could dance.
Certainly, he replied.
And can he vault among swords, and turn upon a wheel, at his age? has
he got to such a height of skill as that?
He can do anything, he said.
And did you always know this?
Always, he said.
When you were children, and at your birth?
They both said that they did.
This we could not believe. And Euthydemus said: You are incredulous,
Socrates.
Yes, I said, and I might well be incredulous, if I did not know you to
be wise men.
But if you will answer, he said, I will make you confess to similar
marvels.
Well, I said, there is nothing that I should like better than to be
self-convicted of this, for if I am really a wise man, which I never
knew before, and you will prove to me that I know and have always
known all things, nothing in life would be a greater gain to me.
Answer then, he said.
Ask, I said, and I will answer.
Do you know something, Socrates, or nothing?
Something, I said.
And do you know with what you know, or with something else?
With what I know; and I suppose that you mean with my soul?
Are you not ashamed, Socrates, of asking a question when you are asked
one?
Well, I said; but then what am I to do? for I will do whatever you
bid; when I do not know what you are asking, you tell me to answer
nevertheless, and not to ask again.
Why, you surely have some notion of my meaning, he said.
Yes, I replied.
Well, then, answer according to your notion of my meaning.
Yes, I said; but if the question which you ask in one sense is
understood and answered by me in another, will that please you-if I
answer what is not to the point?
That will please me very well; but will not please you equally well,
as I imagine.
I certainly will not answer unless I understand you, I said.
You will not answer, he said, according to your view of the meaning,
because you will be prating, and are an ancient.
Now I saw that he was getting angry with me for drawing distinctions,
when he wanted to catch me in his springes of words. And I remembered
that Connus was always angry with me when I opposed him, and then he
neglected me, because he thought that I was stupid; and as I was
intending to go to Euthydemus as a pupil, I reflected that I had
better let him have his way, as he might think me a blockhead, and
refuse to take me. So I said: You are a far better dialectician than
myself, Euthydemus, for I have never made a profession of the art, and
therefore do as you say; ask your questions once more, and I will
answer.
Answer then, he said, again, whether you know what you know with
something, or with nothing.
Yes, I said; I know with my soul.
The man will answer more than the question; for I did not ask you, he
said, with what you know, but whether you know with something.