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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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The thoughts that come often unsought, and, as it were, drop into the mind, are commonly the most valuable of any we have. – John Locke, 16 May 1699

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The world we have created is a product of our thinking; it cannot be changed without changing our thinking. – Albert Einstein

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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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