“Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigour of the mind.”

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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519

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“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 Renaissance polymath

The Notebooks of Leonardo da Vinci (1883), I Prolegomena and General Introduction to the Book on Painting

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“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 (1452–1519) Italian Renaissance polymath

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Variant: Just as iron rusts from disuse... even so does inaction spoil the intellect.

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“As iron is eaten away by rust, so the envious are consumed by their own passion.”

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§ 5
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“Trees have their sap from water. Water fecundates all things made that are called "creature". We see by means of water. Water gives many souls a splendour not to be outshone by the Angels.”

Von wazzer boume sint gesaft.
wazzer früht al die geschaft,
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mit dem wazzere man gesiht.
wazzer gît maneger sêle schîn,
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“These hearts rust just as iron rusts; and indeed they are polished through the recitation of the Qur’an.”

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Irshadul Qulub; Page 78
Shi'ite Hadith

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“Lies are rust on iron. A blemish on power.”

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“If gold rusts, what then can iron do?”

Source: The Canterbury Tales

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