THEAETETUS by Plato - Complete text

Part 2 Page 23

Soc. Then, first of all, I want you to understand that a man may or may not perceive sensibly that which he knows.

Theaet. True.

Soc. And that which he does not know will sometimes not be perceived by him and sometimes will be perceived and only perceived?

Theaet. That is also true.

Soc. See whether you can follow me better now: Socrates can recognize Theodorus and Theaetetus, but he sees neither of them, nor does he perceive them in any other way; he cannot then by any possibility imagine in his own mind that Theaetetus is Theodorus. Am I not right?

Theaet. You are quite right.

Soc. Then that was the first case of which I spoke.

Theaet. Yes.

Soc. The second case was, that I, knowing one of you and not knowing the other, and perceiving neither, can never think him whom I know to be him whom I do not know.

Theaet. True.

Soc. In the third case, not knowing and not perceiving either of you, I cannot think that one of you whom I do not know is the other whom I do not know. I need not again go over the catalogue of excluded cases, in which I cannot form a false opinion about you and Theodorus, either when I know both or when I am in ignorance of both, or when I know one and not the other. And the same of perceiving: do you understand me?

Theaet. I do.

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