"Why can a man not act himself, be himself, and think for himself? It seems to me that naturalness alone is power; that a borrowed word is weaker than our own weakness, however small we may be."

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Hitherto the principle of causality was universally accepted as an indispensable postulate of scientific research, but now we are told by some physicists that it must be thrown overboard. The fact that such an extraordinary opinion should be expressed in responsible scientific quarters is widely taken to be significant of the all-round unreliability of human knowledge. This indeed is a very serious situation.

— Max Planck