Wherefore, give me your attention, and you will soon perceive that I say nothing to which you can object. That benefit which consists of the action is repaid when we receive it graciously; that other, which consists of something material, we have not then repaid, but we hope to do so. The debt of goodwill has been discharged by a return of goodwill; the material debt demands a material return. Thus, although we may declare that he who has received a benefit with good-will has returned the favour, yet we counsel him to return to the giver something of the same kind as that which he has received. Some part of what we have said departs from the conventional line of thought, and then rejoins it by another path. We declare that a wise man cannot receive an injury; yet, if a man hits him with his fist, that man will be found guilty of doing him an injury. We declare that a fool can possess nothing; yet if a man stole anything from a fool, we should find that man guilty of theft. We declare that all men are mad, yet we do not dose all men with hellebore; but we put into the hands of these very persons, whom we call madmen, both the right of voting and of pronouncing judgment. Similarly, we say that a man who has received a benefit with good-will has returned the favour, yet we leave him in debt nevertheless — bound to repay it even though he has repaid it. This is not to disown benef............