Book 7.17

I think here we ought to make a distinction, in order to render this point more intelligible. Benefits are of two kinds: one, the perfect and true benefit, which can only be bestowed by one wise man upon another; the other, the common vulgar form which ignorant men like ourselves interchange. With regard to the latter, there is no doubt that it is my duty to repay it whether my friend turns out to be a murderer, a thief, or an adulterer. Crimes have laws to punish them; criminals are better reformed by judges than by ingratitude; a man ought not to make you bad by being so himself. I will fling a benefit back to a bad man, I will return it to a good man; I do so to the latter, because I owe it to him; to the former, that I may not be in his debt.