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 is] what a great many people think they are doing when they are merely rearranging their prejudices. – William James

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People demand freedom of speech as a compensation for the freedom of thought which they seldom use. – Søren Kierkegaard

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Our minds are lazier than our bodies. – François VI de la Rochefoucault

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