You say that you have done all in your power to repay your debt; this ought to be enough for your friend, but not enough for you. He to whom you owe a kindness, is unworthy of gratitude if he lets all your anxious care and trouble to repay it go for nothing; and so, too, if your friend takes your good will as a repayment, you are ungrateful if you are not all the more eager to feel the obligation of the debt which he has forgiven you. Do not snap up his receipt, or call witnesses to prove it; rather seek opportunities for repaying not less than before; repay the one man because he asks for repayment, the other because he forgives you your debt; the one because he is good, the other because he is bad. You, need not, therefore, think that you have anything to do with the question whether a man be bound to repay the benefit which he has received from a wise man, if that man has ceased to be wise and has turned into a bad man. You would return a deposit which you had received from a wise man; you would return a loan even to a bad man; what grounds have you for not returning a benefit also? Because he has changed, ought he to change you? What?