On the Merits and Forgiveness of Sins, and on the Baptism of Infants: An Objection of the Pelagians: Why Does Not a Righteous Man Beget a Righteous Man?

In vain, then, do some of them argue: “If a sinner begets a sinner, so that the guilt of original sin must be done away in his infant son by his receiving baptism, in like manner ought a righteous man to beget a righteous son.” Just as if a man begat children in the flesh by reason of his righteousness, and not because he is moved thereto by the concupiscence which is in his members, and the law of sin is applied by the law of his mind to the purpose of procreation. His begetting children, therefore, shows that he still retains the old nature among the children of this world; it does not arise from the fact of his promotion to newness of life among the children of God. For “the children of this world beget and are begotten.” Hence also what is born of them is like them; for “that which is born of the flesh is flesh.” Only the children of God, however, are righteous; but in so far as they are the children of God, they do not carnally beget, because it is of the Spirit, and not of the flesh, that they are themselves begotten. But as many of them as become parents, beget children from the circumstance that they have not yet put off the entire remains of their old nature in exchange for the perfect renovation which awaits them. It follows, therefore, that every son who is born in this old and infirm condition of his father’s nature, must needs himself partake of the same old and infirm condition. In order, then, that he may be begotten again, he must also himself be renewed by the Spirit through the remission of sin; and if this change does not take place in him, his righteous father will be of no use to him. For it is by the Spirit that he is righteous, but it is not by the Spirit that he begat his son. On the other hand, if this change does accrue to him, he will not be damaged by an unrighteous father: for it is by the grace of the Spirit that he has passed into the hope of the eternal newness; whereas it is owing to his carnal mind that his father has wholly remained in the old nature.