Romans 3:31

Plainly, if you show by what patronages of heavenly precedents and precepts it is that you open to adultery alone, and therein to fornication also, the gate of repentance, at this very line our hostile encounter will forthwith cross swords. Yet I must necessarily prescribe you a law, not to stretch out your hand after the old things, not to look backwards: for “the old things are passed away,” according to Isaiah; and “a renewing hath been renewed,” according to Jeremiah; and “forgetful of former things, we are reaching forward,” according to the apostle; and “the law and the prophets (were) until John,” according to the Lord. …

Do we then by grace make void free will? God forbid! Nay, rather we establish free will. For even as the law by faith, so free will by grace, is not made void, but established. For neither is the law fulfilled except by free will; but by the law is the knowledge of sin, by faith the acquisition of grace against sin, by grace the healing of the soul from the disease of sin, by the health of the soul freedom of will, by free will the love of righteousness, by love of righteousness the accomplishment of the law. Accordingly, as the law is not made void, but is established through faith, since faith procures grace whereby the law is fulfilled; so free will is not made void through grace, but is established, since grace cures the will whereby righteousness is freely loved. …

But those enemies of grace never endeavour to lay more secret snares for more vehement opposition to that same grace than when they praise the law, which, without doubt, is worthy to be praised. Because, by their different modes of speaking, and by variety of words in all their arguments, they wish the law to be understood as “grace”, that, to wit, we may have from the Lord God the help of knowledge, whereby we may know those things which have to be done, not the inspiration of love, that, when known, we may do them with a holy love, which is properly grace. …

This then was one sense in which He fulfilled it. Another, that He did the same through us also; for this is the marvel, that He not only Himself fulfilled it, but He granted this to us likewise. Which thing Paul also declaring said, “Christ is the end of the law for righteousness to every one that believeth.” And he said also, that “He judged sin in the flesh, that the righteousness of the law might be fulfilled in us who walk not after the flesh.” And again, “Do we then make void the law through faith? God forbid! yea, we establish the law.” For since the law was laboring at this, to make man righteous, but had not power, He came and brought in the way of righteousness by faith, and so established that which the law desired: and what the law could not by letters, this He accomplished by faith. On this account He saith, “I am not come to destroy the law.”

Ver. 31 . “Do we then,” he says, “make void the Law through faith? God forbid: yea, we establish the Law.” Do you see his varied and unspeakable judgment? For the bare use of the word “establish” shows that it was not then standing, but was worn out ( καταλελυμένον ). And note also Paul’s exceeding power, and how superabundantly he maintains what he wishes. For here he shows that the faith, so far from doing any disparagement to the “Law,” even assists it, as it on the other hand paved the way for the faith. For as the Law itself before bore witness to it (for he saith, “being witnessed by the Law and the Prophets”), so here this establisheth that, now that it is unnerved. And how did it establish? he would say. What was the object of the Law and what the scope of all its enactments? Why, to make man righteous. But this it had no power to do. …

What then of the Law (he says)? We have condemned it, and again we run back to it. This is not a shifting about, for here also [under the Gospel] we have a law. “Do we then” (he says) “make void the law through faith? God forbid, yea we establish the Law.” ( Rom. iii. 31 .) I was speaking concerning evil deeds. For he that intends to pursue virtue ought to condemn wickedness first, and then go in pursuit of it. For repentance cannot prove them clean. For this cause they were straightway baptized, that what they were unable to accomplish by themselves, this might be effected by the grace of Christ. Neither then does repentance suffice for purification, but men must first receive baptism. At all events, it was necessary to come to baptism, having condemned the sins thereby and given sentence against them.