Werner Heisenberg

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Not only is the Universe stranger than we think, it is stranger than we can think

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There are things that are so serious that you can only joke about them

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Quantum theory provides us with a striking illustration of the fact that we can fully understand a connection though we can only speak of it in images and parables

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[T]he atoms or elementary particles themselves are not real; they form a world of potentialities or possibilities rather than one of things or facts

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The positivists have a simple solution: the world must be divided into that which we can say clearly and the rest, which we had better pass over in silence. But can anyone conceive of a more pointless philosophy, seeing that what we can say clearly amounts to next to nothing? If we omitted all that is unclear, we would probably be left completely uninteresting and trivial tautologies