The question is, whether one who has done everything in his power to return a benefit, has returned it. “You may know,” says our adversary, “that he has not returned it, because he did everything in his power to return it; it is evident, therefore, that he did not do that which he did not have an opportunity of doing. A man who searches everywhere for his creditor without finding him does not thereby pay him what he owes.” Some are in such a position that it is their duty to effect something material; in the case of others to have done all in their power to effect it is as good as effecting it. If a physician has done all in his power to heal his patient he has performed his duty; an advocate who employs his whole powers of eloquence on his client’s behalf, performs his duty even though his client be convicted; the generalship even of a beaten commander is praised if he has prudently, laboriously, and courageously exercised his functions.