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[167b] let us consider afresh, in the first place, whether such a thing as this is possible or not—to know that one knows, and does not know, what one knows and what one does not know; and secondly, if this is perfectly possible, what benefit we get by knowing it.

We must indeed consider, he said.

Come then, I said, Critias, consider if you can show yourself any more resourceful than I am; for I am at a loss. Shall I explain to you in what way?

By all means, he replied.

Well, I said, what all this comes to, if your last statement was correct, is merely that there is one science which


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