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He assented.

But if he cannot speak falsely, may he not think falsely?

No, he cannot, he said.

Then there is no such thing as false opinion?

No, he said.

Then there is no such thing as ignorance, or men who are ignorant; for is not ignorance, if there be such a thing, a mistake of fact?

Certainly, he said.

And that is impossible?

Impossible, he replied.

Are you saying this as a paradox, Dionysodorus; or do you seriously maintain no man to be ignorant?

Refute me, he said.

But how can I refute you, if, as you say, to tell a falsehood is impossible?

Very true, said Euthydemus.

Neither did I tell you just now to refute me, said Dionysodorus; for how can I tell you to do that which is not?

O Euthydemus, I said, I have but a dull conception of these subtleties and excellent devices of wisdom; I am afraid that I hardly understand them, and you must forgive me therefore if I ask a very stupid question: if there be no falsehood or false opinion or ignorance, there can be no such thing as erroneous action, for a man cannot fail of acting as he is acting—that is what you mean?