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.
Leonardo da Vinci (1452-1519) Italian artist, engineer, scientist, polymath
The Notebooks of Leonardo da Vinci, Vol. 1, ch. 2 “Aphorisms” (1888) [ed/tr. McCurdy (1938 ed.)]
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Source noted as Codice Atlantico 289 v. c.
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disuse
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We are of opinion that instead of letting books grow moldy behind an iron grating, far from the vulgar gaze, it is better to let them wear out by being read.
Jules Verne (1828-1905) French novelist, poet, playwright
Journey to the Center of the Earth (1864)
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