It is the act of a bad man to deceive by falsehood.
Improbi hominis est mendacio fallere.
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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False words are not only evil in themselves, but they infect the soul with evil.
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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.