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SOC. Don’t you remember, either, the similar dispute about these errors, especially about sleeping and waking?
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THEAET. What dispute?
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SOC. One which I fancy you have often heard. The question is asked, what proof you could give if anyone should ask us now, at the present moment, whether we are asleep and our thoughts are a dream, or whether we are awake and talking with each other in a waking condition.
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THEAET. Really, Socrates, I don’t see what proof can be given; for there is an exact correspondence in all particulars, as between the strophe and antistrophe of a choral song. Take, for instance, the conversation we have just had: there is nothing to prevent us from imagining in our sleep also that we are carrying on this conversation with each other, and when in a dream we imagine that we are relating dreams, the likeness between the one talk and the other is remarkable.
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SOC. So you see it is not hard to dispute the point, since it is even open to dispute whether we are awake or in a dream. Now since the time during which we are asleep is equal to that during which we are awake, in each state our spirit contends that the semblances that appear to it at any time are certainly true, so that for half the time we say that this is true, and for half the time the other, and we maintain each with equal confidence.
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THEAET. Certainly.
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SOC. And may not, then, the same be said about insanity and the other diseases, except that the time is not equal?
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THEAET. Yes.
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SOC. Well, then, shall truth be determined by the length or shortness of time?
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THEAET. That would be absurd in many ways.
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SOC. But can you show clearly in any other way which of the two sets of opinions is true?
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THEAET. I do not think I can.