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Str. When one of them says in his talk that many, or one, or two are, or have become, or are becoming, and again speaks of hot mingling with cold, and in some other part of his discourse suggests separations and combinations, for heaven’s sake, Theaetetus, do you ever understand what they mean by any of these things? I used to think, when I was younger, that I understood perfectly whenever anyone used this term not-being, which now perplexes us. But you see what a slough of perplexity we are in about it now.
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Theaet. Yes, I see.
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Str. And perhaps our minds are in this same condition as regards being also; we may think that it is plain sailing and that we understand when the word is used, though we are in difficulties about not-being, whereas really we understand equally little of both.
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Theaet. Perhaps.
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Str. And we may say the same of all the subjects about which we have been speaking.
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Theaet. Certainly.
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Str. We will consider most of them later, if you please, but now the greatest and foremost chief of them must be considered.
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Theaet. What do you mean? Or, obviously, do you mean that we must first investigate the term being, and see what those who use it think it signifies?