Deuteronomy 30:6

By encouragement He assuages sins, reducing lust, and at the same time inspiring hope for salvation. For He says by Ezekiel, “If ye return with your whole heart, and say, Father, I will hear you, as a holy people.” And again He says, “Come all to Me, who labour, and are heavy laden, and I will give you rest;” and that which is added the Lord speaks in His own person. And very clearly He calls to goodness by Solomon, when He says, “Blessed is the man who hath found wisdom, and the mortal who hath found understanding.” “For the good is found by him who seeks it, and is wont to be seen by him who has found it.” By Jeremiah, too, He sets forth prudence, when he says, “Blessed are we, Israel; for what is pleasing to God is known by us; and it is known by the Word, by whom we are blessed and wise. …

In Jeremiah: “Thus saith the Lord to the men of Judah, and to them who inhabit Jerusalem, Renew newness among you, and do not sow among thorns: circumcise yourselves to your God, and circumcise the foreskin of your heart; lest my anger go forth like fire, and burn you up, and there be none to extinguish it.” Also Moses says: “In the last days God will circumcise thy heart, and the heart of thy seed, to love the Lord thy God.” Also in Jesus the son of Nave: “And the Lord said unto Jesus, Make thee small knives of stone, very sharp, and set about to circumcise the children of Israel for the second time.” Paul also, to the Colossians: “Ye are circumcised with the circumcision not made with hands in the putting off of the flesh, but with the circumcision of Christ.” Also, because Adam was first made by God uncircumcised, and righteous Abel, and Enoch, who pleased God and was translated; and …

In like manner, Isaiah thus prophesied concerning the abolition of circumcision: “Thus saith the Lord to the men of Judah who dwell at Jerusalem, Break up your fallow ground, and sow not among thorns. Circumcise yourselves to the Lord your God, and take away the foreskins of your heart, lest my fury come forth like fire, and burn that none can quench it.” Also Moses himself says: “In the last days the Lord shall circumcise thine heart to love the Lord thy God.” Also Jesus the son of Nun, his successor, said: “And the Lord said unto Jesus , Make thee knives of flint very sharp, and sit and circumcise the children of Israel the second time.” He said that this second circumcision would be not of the flesh, as the first was, which the Jews practice even now, but of the heart and spirit, which was delivered by Christ, who was the true Jesus . …

“For when the Gentiles,” he says, “which have not the Law.” What Law, say? The written one. “Do by nature the things of the Law.” Of what Law? Of that by works. “These having not the Law.” What Law? The written one. “Are a law unto themselves.” How so? By using the natural law. “Who show the work of the Law.” Of what law? Of that by actions. For that which is by writing lieth outside; but this is within, the natural one, and the other is in actions. And one the writing proclaims; and another, nature; and another, actions. Of this third there is need, for the sake of which also those two exist, both the natural and the written. And if this be not present they are of no good, but even very great harm. …