XXXIV. "But," says our opponent, "whatever you do, whatever you are able to give to your father, is part of his benefit bestowed upon you." So it is the benefit of my teacher that I have become proficient in liberal studies; yet we pass on from those who taught them to us, at any rate from those who taught us the alphabet; and although no one can learn anything without them, yet it does not follow that whatsoever success one subsequently obtains, one is still inferior to those teachers. There is a great difference between the beginning of a thing and its final development; the beginning is not equal to the thing at its greatest, merely upon the ground that, without the beginning, it could never have become so great. XXXV. It is now time for me to bring forth something, so to speak, from my own mint. So long as there is something better than the benefit which a man bestows, he may be outdone. A father gives life to his son; there is something better than life; therefore a father may be outdone, because there is something better than the benefit which he has bestowed. Still further, he who has given any one his life, if he be more than once saved from peril of death by him, has received a greater benefit than he bestowed. Now, a father has given life to his son: if, therefore, he be more than once saved from peril by his son, he can receive a greater benefit than he gave. A benefit becomes greater to the receiver in proportion to his need of it. Now he who is alive needs life more than he who has not been born, seeing that such a one can have no need at all; consequently a father, if his life is saved by his son, receives a greater benefit than his son received from him by being born. It is said, "The benefits conferred by fathers cannot be outdone by those returned by their sons." Why? "Because the son received life from his father, and had he not received it, he could not have returned any benefits at all." A father has this in common with all those who have given any men their lives; it is impossible that these men could repay the debt if they had not received their life. Then I suppose one cannot overpay one's debt to a physician, for a physician gives life as well as a father; or to a sailor who has saved us when shipwrecked? Yet the benefits bestowed by these and by all the others who give us life in whatever fashion, can be outdone: consequently those of our fathers can be outdone. If any one bestows upon me a benefit which requires the help of benefits from many other persons, whereas I give him what requires no one to help it out, I have given more than I have received; now a father gave to his son a life which, without many accessories to preserve it, would perish; whereas a son, if he gives life to his father, gives him a life which requires no assistance to make it lasting; therefore the father who receives life from his son, receives a greater benefit than he himself bestowed upon his son.