Reply to Faustus the Manichaean

⁷ Augustine replied: If you allow, in consideration of the authority of the Gospel, that Christ said that He came not to destroy the law and the prophets, but to fulfill them, you should show the same consideration to the authority of the apostle, when he says, "All these things were our examples;" and again of Christ, "He was not yea and nay, but in Him was yea; for all the promises of God are in Him yea;" that is, they are set forth and fulfilled in Him.

In this way you will see in the clearest light both what law Christ fulfilled, and how He fulfilled it. It is a vain attempt that you make to escape by your three kinds of law and your three kinds of prophets. It is quite plain, and the New Testament leaves no doubt on the matter, what law and what prophets Christ came not to destroy, but to fulfill. The law given by Moses is that which by Jesus Christ became grace and truth. The law given by Moses is that of which Christ says, "He wrote of me." For undoubtedly this is the law which entered that the offense might abound; words which you often ignorantly quote as a reproach to the law.

Read what is there said of this law: "The law is holy, and the commandment holy, and just, and good. Was then that which is good made death unto me? God forbid. But sin, that it might appear sin, wrought death in me by that which is good." The entrance of the law made the offense abound, not because the law required what was wrong, but because the proud and self-confident incurred additional guilt as transgressors after their acquaintance with the holy, and just, and good commandments of the law; so that, being thus humbled, they might learn that only by grace through faith could they be freed from subjection to the law as transgressors, and be reconciled to the law as righteous.

So the same apostle says: "For before faith came, we were kept under the law, shut up unto the faith which was afterwards revealed. Therefore the law was our schoolmaster in Christ Jesus; but after faith came, we are no longer under a schoolmaster." That is, we are no longer subject to the penalty of the law, because we are set free by grace. Before we received in humility the grace of the Spirit, the letter was only death to us, for it required obedience which we could not render.

Thus Paul also says: "The letter kills, but the spirit gives life." Again, he says: "For if a law had been given which could have given life, verily righteousness should have been by the law; but the Scripture has concluded all under sin, that the promise by faith of Jesus Christ might be given to them that believe." And once more: "What the law could not do, in that it was weak through the flesh, God sent His Son in the likeness of sinful flesh, that by sin He might condemn sin in the flesh, that the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit." Here we see Christ coming not to destroy the law, but to fulfill it.

As the law brought the proud under the guilt of transgression, increasing their sin by commandments which they could not obey, so the righteousness of the same law is fulfilled by the grace of the Spirit in those who learn from Christ to be meek and lowly in heart; for Christ came not to destroy the law, but to fulfill it. Moreover, because even for those who are under grace it is difficult in this mortal life perfectly to keep what is written in the law, You shall not covet, Christ, by the sacrifice of His flesh, as our Priest obtains pardon for us.

And in this also He fulfills the law; for what we fail in through weakness is supplied by His perfection, who is the Head, while we are His members. Thus John says: "My little children, these things write I unto you, that you sin not; and if any man sin, we have an Advocate with the Father, Jesus Christ the righteous: He is the propitiation for our sins."