All the keys hang not at one man's girdle.

Meaning: No single person possesses authority or knowledge over all matters; responsibility and expertise must be distributed.

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

Translations

French: Toutes les clefs ne pendent pas à une ceinture (literally: All the keys don’t hang at one girdle)

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