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Iron 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's Notebooks edited by Edward McCurdy
— Leonardo da Vinci
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Iron 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's Notebooks edited by Edward McCurdy
— Leonardo da Vinci