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Leonardo da Vinci: Just as iron rusts unless it is used, and water putrifies or, in cold, turns to…

Just as iron rusts unless it is used, and water putrifies or, in cold, turns to ice, so our intellect spoils unless it is kept in use.

In today’s wordsJust as iron rusts when it isn't used, and water goes stagnant or, in the cold, turns to ice, so our minds spoil unless they're kept in use.

Leonardo da VinciSourced
Source
From the book The Notebooks of Leonardo da Vinci, Morals, How to spend life, no. 1177; translated by Jean Paul Richter, 1888

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