“Cuiusvis hominis est errare, nullius nisi insipientis in errore perseverare.” attributed to Marcus Tullius Cicero

“Anyone can err, but only the fool persists in his fault.”
“Any man can make a mistake, but only the unwise persists in his fault.” (insipientis = unwise; sapientia = wisdom)

Other Variations:
Errare humanum est perseverare diabolicum

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