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In a promise, what you thought, and not what you said, is always to be considered.

Marcus Tullius Cicero (1856). “Cicero's Three Books Of Offices, Or Moral Duties: Also His Cato Major, an Essay on Old Age; Laelius, an Essay on Friendship; Paradoxes; Scipio's Dream; and Letter to Quintus on the Duties of a Magistrate”, p.24
In a promise, what you thought, and not what you said, is always to be considered.