Leonardo da Vinci: Just as iron rusts unless it is used, and water putrifies or, in cold, turns to ice, so our intellect spoils unless it i

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

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.

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