“Why then,” argues our adversary, “did your Stoic philosopher Zeno, when he had promised a loan of five hundred denarii to some person, whom he afterwards discovered to be of doubtful character, persist in lending it, because of his promise, though his friends dissuaded him from doing so?” In the first place a loan is on a different footing to a benefit. Even when we have lent money to an undesirable person we can recall it; I can demand payment upon a certain day, and if he becomes bankrupt, I can obtain my share of his property; but a benefit is lost utterly and instantly. Besides, the one is the act of a bad man, the other that of a bad father of a family. In the next place, if the sum had been a larger one, not even Zeno would have persisted in lending it. It was five hundred denarii; the sort of sum of which one says, “May he spend it in sickness,” and it was worth paying so much to avoid breaking his promise. I shall go out to supper, even though the weather be cold, because I have promised to go; but I shall not if snow be falling. I shall leave my bed to go to a betrothal feast, although I may be suffering from indigestion; but I shall not do so if I am feverish.