euthydemus   

of their own skulls gilt and see the inside of them, and hold their
own head in their hands.
And do the Scythians and others see that which has the quality of
vision, or that which has not? said Euthydemus.
That which has the quality of vision clearly.
And you also see that which has the quality Of vision? he said.
Yes, I do.
Then do you see our garments?
Yes.
Then our garments have the quality of vision.
They can see to any extent, said Ctesippus.
What can they see?
Nothing; but you, my sweet man, may perhaps imagine that they do not
see; and certainly, Euthydemus, you do seem to me to have been caught
napping when you were not asleep, and that if it be possible to speak
and say nothing-you are doing so.
And may there not be a silence of the speaker? said Dionysodorus.
Impossible, said Ctesippus.
Or a speaking of the silent?
That is still more impossible, he said.
But when you speak of stones, wood, iron bars, do you not speak of the
silent?
Not when I pass a smithy; for then the iron bars make a tremendous
noise and outcry if they are touched: so that here your wisdom is
strangely mistaken, please, however, to tell me how you can be silent
when speaking (I thought that Ctesippus was put upon his mettle
because Cleinias was present).
When you are silent, said Euthydemus, is there not a silence of all
things?
Yes, he said.
But if speaking things are included in all things, then the speaking
are silent.
What, said Ctesippus; then all things are not silent?
Certainly not, said Euthydemus.
Then, my good friend, do they all speak?
Yes; those which speak.
Nay, said Ctesippus, but the question which I ask is whether all
things are silent or speak?
Neither and both, said Dionysodorus, quickly interposing; I am sure
that you will be "nonplussed" at that answer.
Here Ctesippus, as his manner was, burst into a roar of laughter; he
said, That brother of yours, Euthydemus, has got into a dilemma; all
is over with him. This delighted Cleinias, whose laughter made
Ctesippus ten times as uproarious; but I cannot help thinking that the
rogue must have picked up this answer from them; for there has been no
wisdom like theirs in our time. Why do you laugh, Cleinias, I said, at
such solemn and beautiful things?
Why, Socrates, said Dionysodorus, did you ever see a beautiful thing?
Yes, Dionysodorus, I replied, I have seen many.
Were they other than the beautiful, or the same as the beautiful?
Now I was in a great quandary at having to answer this question, and I
thought that I was rightly served for having opened my mouth at all: I
said however, They are not the same as absolute beauty, but they have
beauty present with each of them.
And are you an ox because an ox is present with you, or are you
Dionysodorus, because Dionysodorus is present with you?
God forbid, I replied.
But how, he said, by reason of one thing being present with another,
will one thing be another?
Is that your difficulty? I said. For I was beginning to imitate their
skill, on which my heart was set.