12 You say in your letter: “You do not require me to teach you in what sense the apostle says, 'To the Jews I became as a Jew, that I might gain the Jews;' and other such things in the same passage, which are to be ascribed to the compassion of pitying love, not to the artifices of intentional deceit. For he that ministers to the sick becomes as if he were sick himself, not indeed falsely pretending to be under the fever, but considering with the mind of one truly sympathizing what he would wish done for himself if he were in the sick man's place. Paul was indeed a Jew; and when he had become a Christian, he had not abandoned those Jewish sacraments which that people had received in the right way, and for a certain appointed time. Therefore, even when he was an apostle of Christ, he took part in observing these, but with this view, that he might show that they were in no wise hurtful to those who, even after they had believed in Christ, desired to retain the ceremonies which by the law they had learned from their fathers; provided only that they did not build on these their hope of salvation, since the salvation which was fore-shadowed in these has now been brought in by the Lord Jesus.” The sum of your whole argument, which you have expanded into a most prolix dissertation, is this, that Peter did not err in supposing that the law was binding on those who from among the Jews had believed, but departed from the right course in this, that he compelled the Gentile converts to conform to Jewish observances. Now, if he compelled them, it was not by use of authority as a teacher, but by the example of his own practice. And Paul, according to your view, did not protest against what Peter had done personally, but asked wherefore Peter would compel those who were from among the Gentiles to conform to Jewish observances.
13. The matter in debate, therefore, or I should rather say your opinion regarding it, is summed up in this: that since the preaching of the gospel of Christ, the believing Jews do well in observing the precepts of the law, i.e. in offering sacrifices as Paul did, in circumcising their children, as Paul did in the case of Timothy, and keeping the Jewish Sabbath, as all the Jews have been accustomed to do. If this be true, we fall into the heresy of Cerinthus and Ebion, who, though believing in Christ, were anathematized by the fathers for this one error, that they mixed up the ceremonies of the law with the gospel of Christ, and professed their faith in that which was new, without letting go what was old. Why do I speak of the Ebionites, who make pretensions to the name of Christian? In our own day there exists a sect among the Jews throughout all the synagogues of the East, which is called the sect of the Minei, and is even now condemned by the Pharisees. The adherents to this sect are known commonly as Nazarenes; they believe in Christ the Son of God, born of the Virgin Mary; and they say that He who suffered under Pontius Pilate and rose again, is the same as the one in whom we believe. But while they desire to be both Jews and Christians, they are neither the one nor the other. I therefore beseech you, who think that you are called upon to heal my slight wound, which is no more, so to speak, than a prick or scratch from a needle, to devote your skill in the healing art to this grievous wound, which has been opened by a spear driven home with the impetus of a javelin. For there is surely no proportion between the culpability of him who exhibits the various opinions held by the fathers in a commentary on Scripture, and the guilt of him who reintroduces within the Church a most pestilential heresy. If, however, there is for us no alternative but to receive the Jews into the Church, along with the usages prescribed by their law; if, in short, it shall be declared lawful for them to continue in the Churches of Christ what they have been accustomed to practise in the synagogues of Satan, I will tell you my opinion of the matter: they will not become Christians, but they will make us Jews.
14. For what Christian will submit to hear what is said in your letter? “Paul was indeed a Jew; and when he had become a Christian, he had not abandoned those Jewish sacraments which that people had received in the right way, and for a certain appointed time. Therefore, even when he was an apostle of Christ, he took part in observing these; but with this view, that he might show that they were in no wise hurtful to those who, even after they had believed in Christ, desired to retain the ceremonies which by the law they had learned from their fathers.” Now I implore you to hear patiently my complaint. Paul, even when he was an apostle of Christ, observed Jewish ceremonies; and you affirm that they are in no wise hurtful to those who wish to retain them as they had received them from their fathers by the law. I, on the contrary, shall maintain, and, though the world were to protest against my view, I may boldly declare that the Jewish ceremonies are to Christians both hurtful and fatal; and that whoever observes them, whether he be Jew or Gentile originally, is cast into the pit of perdition. “For Christ is the end of the law for righteousness to every one that believes,” that is, to both Jew and Gentile; for if the Jew be excepted, He is not the end of the law for righteousness to every one that believes. Moreover, we read in the Gospel, “The law and the prophets were until John the Baptist.” Also, in another place: “Therefore the Jews sought the more to kill Him, because He had not only broken the Sabbath, but said also that God was His Father, making Himself equal with God.” Again: “Of His fullness have all we received, and grace for grace; for the law was given Moses, but grace and truth came by Jesus Christ.” Instead of the grace of the law which has passed away, we have received the grace of the gospel which is abiding; and instead of the shadows and types of the old dispensation, the truth has come by Jesus Christ. Jeremiah also prophesied thus in God's name: “Behold, the days come, says the Lord, that I will make a new covenant with the house of Israel, and with the house of Judah; not according to the covenant which I made with their fathers, in the day that I took them by the hand, to bring them out of the land of Egypt.” Observe what the prophet says, not to Gentiles, who had not been partakers in any former covenant, but to the Jewish nation. He who has given them the law by Moses, promises in place of it the new covenant of the gospel, that they might no longer live in the oldness of the letter, but in the newness of the spirit. Paul himself, moreover, in connection with whom the discussion of this question has arisen, delivers such sentiments as these frequently, of which I subjoin only a few, as I desire to be brief: “Behold, I Paul say unto you, that if you be circumcised, Christ shall profit you nothing.” Again: “Christ has become of no effect unto you, whosoever of you are justified by the law; you are fallen from grace.” Again: “If you be led of the Spirit, you are not under the law.” From which it is evident that he has not the Holy Spirit who submits to the law, not, as our fathers affirmed the apostles to have done, feignedly, under the promptings of a wise discretion, but, as you suppose to have been the case, sincerely. As to the quality of these legal precepts, let us learn from God's own teaching: “I gave them,” He says, “statutes that were not good, and judgments whereby they should not live.” I say these things, not that I may, like Manichæus and Marcion, destroy the law, which I know on the testimony of the apostle to be both holy and spiritual; but because when “faith came,” and the fullness of times, “God sent forth His Son, made of a woman, made under the law, to redeem them that were under the law, that we might receive the adoption of sons,” and might live no longer under the law as our schoolmaster, but under the Heir, who has now attained to full age, and is Lord.
Source: Letters (New Advent)