"There is a principle, supposed to prevail among many, which is utterly incompatible with all virtue or moral sentiment; and as it can proceed from nothing but the most depraved disposition, so in its turn it tends still further to encourage that depravity. This principle is, that all benevolence is mere hypocrisy, friendship a cheat, public spirit a farce, fidelity a snare to procure trust and confidence; and that while all of us, at bottom, pursue only our private interest, we wear these fair disguises, in order to put others off their guard, and expose them the more to our wiles and machinations."
January 1, 1970
https://en.wikiquote.org/wiki/Morality