Time has been called God's way of making sure that everything doesn't happen at once. In the same spirit, noise is Nature's way of making sure that we don't find out everything that happens. Noise, in short, is the protector of information.
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Notes from Wikiquote
von Baeyer did not originate the quip about time, which dates back at least as far as the 1929 book "The Man Who Mastered Time" by Ray Cummings, where it appears on p. 1.