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

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Physiological response to thinking and to pain is the same; and man is not given to hurting himself. – Martin H. Fischer (1879–1962)

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He who will not reason is a bigot; he who cannot is a fool; and he who dares not is a slave. – William Drummond, Academical Questions

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Believing is easier than thinking. Hence so many more believers than thinkers. – Bruce Calvert

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