For if false witness by falsehood is injurious to him against whom it is spoken, and deceives him in whose presence it is spoken, we must therefore never speak falsely, because falsehood always deceives or injures. Therefore he is not a just man who, even without inflicting injury, speaks in idle discourse. Nor indeed is it lawful for him to flatter, for flattery is pernicious and deceitful; but he will everywhere guard the truth.
Lactantius, The Divine Institutes 8.60