“Guard yourself from lying; there is he who deceives and there is he who is deceived.”
“…he who seeks to deceive will always find someone who will allow himself to be deceived.”
“One who deceives will always find those who allow themselves to be deceived.”
“Therefore do not deceive yourself! Of all deceivers fear most yourself!”
“It's not right to hurt or deceive someone who's already been hurt and deceived.”
“Just because something isn't a lie does not mean that it isn't deceptive. A liar knows that he is a liar, but one who speaks mere portions of truth in order to deceive is a craftsman of destruction.”