The Notebooks of Leonardo da Vinci (1883), I Prolegomena and General Introduction to the Book on Painting
“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 1452–1519Related quotes
The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
Variant: Just as iron rusts from disuse... even so does inaction spoil the intellect.
“As iron is eaten away by rust, so the envious are consumed by their own passion.”
§ 5
From Lives and Opinions of the Eminent Philosophers by Diogenes Laërtius
Source: Treatise Concerning Eternal and Immutable Morality (1731), Ch. 1, sct. 1
Irshadul Qulub; Page 78
Shi'ite Hadith
“Lies are rust on iron. A blemish on power.”
Source: Golden Son (2015), Ch. 15: Truth; Aja