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. - Leonardo da Vinci Quotes

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.[Siccome il ferro s’arruginiscie sanza esercitio, e l’acqua si putrefa e nel freddo s’agghiaccia, così l’ingiegnio sanza e sercitio si guasta.]

Source:The Literary Works of Leonardo da Vinci (Richter, ed. 1883), Volume II, Section 1177, Page 294
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