The faulty stands on his guard.

Meaning: One conscious of personal weakness remains vigilant against exploitation or exposure.

Origin: From 'A Dictionary of English Proverbs and Proverbial Phrases' (1870). Public domain.

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February makes a bridge, and March breaks it. — Winter's deceptive mild spells in February create false hope before March's renewed cold…
Feed sparingly, and defy the physician. — Moderate eating prevents illness, making medical intervention unnecessary.
The fifer don't pay a fiddler. — A musician playing one instrument cannot compensate another musician for their work.

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