Heraclitus assumes the conflict between opposites is the basis of all existence. "They do not understand," he says, "that the all-One, conflicting in itself, is identical with itself: conflicting harmony as in the bow and in the lyre." Or still more clearly: "We go into the same river, and yet not in the same; it is we and it is not we." Or "One and the same manifests itself in things as living and dead, waking and sleeping, young and old."
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