Leonardo da Vinci: Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap th

Iron rusts from disuse; stagnant water loses its purity and in cold weather beco — Leonardo da Vinci

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.

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