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Aerugo animi rubigo ingenii.
The rust of the mind is the destruction of genius.
Alfred Henderson, Latin Proverbs, page 10 (1869), quoting Seneca. An equivalent English proverb: "I had rather wear out than rust out." Written by George Whitfield in his Remark (c. 1770).
This entry is located in the following units: aero-, aer-, aeri- (page 11) Latin Proverbs, Mottoes, Phrases, and Words: Group A (page 12)