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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Thinking in its lower grades is comparable to paper money, and in its higher forms it is a kind of poetry. – Havelock Ellis, The Dance of Life, 1923

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Invest a few moments in thinking. It will pay good interest. – Author Unknown

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