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.
LD
Leonardo da VinciThe Notebooks of Leonardo da Vinci, tr. Richter (1883)
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.
Renaissance painter, engineer and inventor who filled notebooks with observations. (1452-1519)
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