Irons rusts from disuse, stagnant water loses its purity and in co

Irons rusts from disuse, stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind. – Leonardo da Vinci, Notebooks, 1508

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What luck for rulers, that men do not think. – Adolph Hitler

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Practical gentlemen hate uncertainty, balancing of probabilities, skepticism or approximation. They have a number of bitterly satirical comments on persons whose minds are so open that their brains fall out. They are bent on getting to a conclusion. – Max Radin, 1937

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Few minds wear out; more rust out. – Christian N. Bovee

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Some people do not become thinkers simply because their memories are too good. – Friedrich Wilhelm Nietzsche

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