He who has once deviated from the truth, usually commits perjury with as little scruple as he would tell a lie.
Qui semel a veritate deflexit, hic non majore religione ad perjurium quam ad mendacium perduci consuevit.
Original text (Latin)
More quotes by Cicero
I never cease urging peace, which, however unfair, is better than the justest war in the world.
Every one is least known to himself, and it is very difficult for a man to know himself.
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Attribution
Quote text and notes from Wikiquote: Cicero (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.