E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Mind your Own Business.
“Seest thou a man diligent in his business, he shall stand before kings” (Prov. xxii.29). “He who doeth his own business defileth not his fingers” (Fielding’s Proverbs.) Let every tub stand on its own bottom. Never meddle with what does not concern you.
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“Bon homme, garde la vache. Chacun son métier, et les vaches son bien gardées. Chacun à ses affaires.”
“Qui fa le fatti suoi, non s’embratta le mani.”
“Tuâ quod nihil refert ne cures. Suum cura negotium. Tu ne quæsiveris extra.”—Horace.
