other mathematician who argued from probabilities and likelihoods in
geometry, would not be worth an ace.

THEAETETUS: But neither you nor we, Socrates, would be satisfied with such
arguments.

SOCRATES: Then you and Theodorus mean to say that we must look at the
matter in some other way?

THEAETETUS: Yes, in quite another way.

SOCRATES: And the way will be to ask whether perception is or is not the
same as knowledge; for this was the real point of our argument, and with a
view to this we raised (did we not?) those many strange questions.

THEAETETUS: Certainly.

SOCRATES: Shall we say that we know every thing which we see and hear? for
example, shall we say that not having learned, we do not hear the language
of foreigners when they speak to us? or shall we say that we not only hear,
but know what they are saying? Or again, if we see letters which we do not
understand, shall we say that we do not see them? or shall we aver that,
seeing them, we must know them?

THEAETETUS: We shall say, Socrates, that we know what we actually see and
hear of them--that is to say, we see and know the figure and colour of the
letters, and we hear and know the elevation or depression of the sound of
them; but we do not perceive by sight and hearing, or know, that which
grammarians and interpreters teach about them.