Jeremias 31:31

“There will be no other God, O Trypho, nor was there from eternity any other existing” (I thus addressed him), “but He who made and disposed all this universe. Nor do we think that there is one God for us, another for you, but that He alone is God who led your fathers out from Egypt with a strong hand and a high arm. Nor have we trusted in any other (for there is no other), but in Him in whom you also have trusted, the God of Abraham, and of Isaac, and of Jacob. But we do not trust through Moses or through the law; for then we would do the same as yourselves. But now, (for I have read that there shall be a final law, and a covenant, the chiefest of all, which it is now incumbent on all men to observe, as many as are seeking after the inheritance of God. For the law promulgated on Horeb is now old, and belongs to yourselves alone; but this is for all universally. …

1. All things therefore are of one and the same substance, that is, from one and the same God; as also the Lord says to the disciples “Therefore every scribe, which is instructed unto the kingdom of heaven, is like unto a man that is an householder, which bringeth forth out of his treasure things new and old.” He did not teach that he who brought forth the old was one, and he that brought forth the new, another; but that they were one and the same. For the Lord is the good man of the house, who rules the entire house of His Father; and who delivers a law suited both for slaves and those who are as yet undisciplined; and gives fitting precepts to those that are free, and have been justified by faith, as well as throws His own inheritance open to those that are sons. …

14. And those of them who declare that God would make a new covenant with men, not such as that which He made with the fathers at Mount Horeb, and would give to men a new heart and a new spirit; and again, “And remember ye not the things of old: behold, I make new things which shall now arise, and ye shall know it; and I will make a way in the desert, and rivers in a dry land, to give drink to my chosen people, my people whom I have acquired, that they may show forth my praise,”, plainly announced that liberty which distinguishes the new covenant, and the new wine which is put into new bottles, [that is], the faith which is in Christ, by which He has proclaimed the way of righteousness sprung up in the desert, and the streams of the Holy Spirit in a dry land, to give water to the elect people of God, whom He has acquired, that they might show forth His praise, but not that they might bla …

Then he adds: “Worship this God not as the Greeks,”, signifying plainly, that the excellent among the Greeks worshipped the same God as we, but that they had not learned by perfect knowledge that which was delivered by the Son. “Do not then worship,” he did not say, the God whom the Greeks worship, but “as the Greeks,”, changing the manner of the worship of God, not announcing another God. What, then, the expression “not as the Greeks” means, Peter himself shall explain, as he adds: “Since they are carried away by ignorance, and know not God” (as we do, according to the perfect knowledge); “but giving shape to the things of which He gave them the power for use, stocks and stones, brass and iron, gold and silver, matter; and setting up the things which are slaves for use and possession, worship them. …

In Jeremiah: “Behold, the days come, saith the Lord, and I will complete for the house of Israel, and for the house of Judah, a new testament, not according to the testament which I ordered with their fathers in that day in which I took hold of their hands to bring them out of the land of Egypt, because they remained not in my testament, and I disregarded them, saith the Lord: Because this is the testament which I will establish with the house of Israel after those days, saith the Lord: I will give them my laws, and into their minds I will write them; and I will be to them for a God, and they shall be to me for a people; and they shall not teach every man his brother, saying, Know the Lord: for all shall know me, from the least even to the greatest of them: for I will be merciful to their iniquities, and will no more be mindful of their sins.”

In the cxth Psalm: “The fear of the Lord is the beginning of wisdom.” Of the same thing in the Wisdom of Solomon: “The beginning of wisdom is to fear God.” Also in the Proverbs of the same: “Blessed is the man who reverences all things with fear.” Of the same thing in Isaiah: “And upon whom else will I look, except upon him that is lowly and peaceful, and that trembleth at my words?” Of this same thing in Genesis: “And the angel of the Lord called him from heaven, and said unto him, Abraham, Abraham: and he said, Here am I. …

But all Scripture is divided into two Testaments. That which preceded the advent and passion of Christ, that is, the law and the prophets, is called the Old; but those things which were written after His resurrection are named the New Testament. The Jews make use of the Old, we of the New: but yet they are not discordant, for the New is the fulfilling of the Old, and in both there is the same testator, even Christ, who, having suffered death for us, made us heirs of His everlasting kingdom, the people of the Jews being deprived and disinherited. …

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. …

18. Accordingly, as you in opposing me affirm, and, to quote your own words, “though the world were to protest against it, boldly declare that the Jewish ceremonies are to Christians both hurtful and fatal, and that whoever observes them, whether he was originally Jew or Gentile, is on his way to the pit of perdition,” I entirely indorse that statement, and add to it, “Whoever observes these ceremonies, whether he was originally Jew or Gentile, is on his way to the pit of perdition, not only if he is sincerely observing them, but also if he is observing them with dissimulation.” What more do you ask? But as you draw a distinction between the dissimulation which you hold to have been practised by the apostles, and the rule of conduct befitting the present time, I do the same between the course which Paul, as I think, sincerely followed in all these examples then, and the matter of observi …

9. If we are asked why we do not worship God as the Hebrew fathers of the Old Testament worshipped Him, we reply that God has taught us differently by the New Testament fathers, and yet in no opposition to the Old Testament, but as that Testament itself predicted. For it is thus foretold by the prophet: "Behold, the days come, saith the Lord, when 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 when I took them by the hand to bring them out of the land of Egypt." Thus it was foretold that that covenant would not continue, but that there would be a new one. …

Observe this also in that testimony which was given by the prophet on this subject in the clearest way: “Behold, the days come, saith the Lord, that I will consummate 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. Because they continued not in my covenant, I also have rejected them, saith the Lord. But this shall be the covenant that I will make with the house of Israel; After those days, saith the Lord, I will put my law in their inward parts, and write it in their hearts; and I will be their God, and they shall be my people. …

After saying, “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 He adds: “Because they continued not in my covenant.” He reckons it as their own fault that they did not continue in God’s covenant, lest the law, which they received at that time, should seem to be deserving of blame. For it was the very law that Christ “came not to destroy, but to fulfil.” Nevertheless, it is not by that law that the ungodly are made righteous, but by grace; and this change is effected by the life-giving Spirit, without whom the letter kills. “For if there had been a law given which could have given life, verily righteousness should have been by the law. …