Not that you lied to me but that I no longer believe you - that is what has distressed me.
— Friedrich Nietzsche

Pain forces even the innocent to lie.
Publilius Syrus deceptionlying quote

Lying to ourselves is more deeply ingrained than lying to others.
— Fyodor Dostoyevsky

Deceive the rich and powerful if you will, but don't insult them.
— Japanese Proverbs

Tricks and treachery are the practice of fools, that don't have brains enough to be honest.
— Benjamin Franklin