The Adversary: Your instances are not to the purpose, for he who cultivates my land, does not benefit the land, but me; he who props my house so that it does not fall, does this service to me, for the house itself is without feeling, and as it has none, it is I who am indebted to him; and he who cultivates my land does so because he wishes to oblige me, not to oblige the land. I should say the same of a slave; he is a chattel owned by me; he is saved for my advantage, therefore I am indebted for him. My son is himself capable of receiving a benefit; so it is he who receives it; I am gratified at a benefit which comes so near to myself, but am not laid under any obligation.

Seneca: Still I should like you, who say that you are under no obligation, to answer me this. The good health, the happiness, and the inheritance of a son are connected with his father; his father will be more happy if he keeps his son safe, and more unhappy if he loses him. What follows, then? when a man is made happier by me and is freed from the greatest danger of unhappiness, does he not receive a benefit?