The advent of the "new perspective" on Paul (NPP) marked a major shift in the study of the apostle Paul and his theology. In general theologians and biblical scholars associated with the NPP hold that, contra Luther and the entire Reformation tradition, first-century Judaism was not a religion of legalistic works-righteousness, but one that called for obedient action—to borrow a phrase from Paul—"in view of God's mercies" (that is, in response to God's grace in making the Jews his chosen people and establishing a covenant with them). Consequently, the NPP contends (again, contra the Lutheran and Reformed views) that justification by faith is not the center of Paul's theology but only a pragmatic tactic to facilitate the Gentile mission. For, if Judaism is not a religion of works-righteousness, then Jews hardly need to hear the message of justification by faith, whereas that message makes perfect sense if it was directed solely to the Gentiles.
One of the most important corollary contentions of NPP advocates is their understanding of the general concept of the law and specifically Paul's crucial phrase "works of the law" (Gal 2:16; Rom 3:20, 28; etc.). "We know," Paul says in Galatians 2:16, "that a person is not justified by works of the law but through faith in Jesus Christ, so we also have believed in Christ Jesus, in order to be justified by faith in Christ and not by works of the law, because by works of the law no one will be justified" (ESV). Here, and in other places, NPP advocates have limited Paul’s usage of “works of the law” to only “ceremonial observance” or “works done in a legalistic spirit” or “Jewish identity markers.” Such limits would mean that Paul is not denying that justification comes through works done in obedience to the law, but only certain kinds of works or works done in the wrong spirit. But almost five centuries before the NPP, sixteenth-century reformer Martin Luther wrote against the same sort of view of the meaning of "works of the law" as the one held by modern NPP advocates. And, against those who hold such a view, Luther has strong and stinging words:
But they are in the habit of trying to get round Paul here, by making out that what he calls works of the law are the ceremonial works, which since the death of Christ are deadly. I reply that this is the ignorant error of Jerome, which in spite of Augustine’s strenuous resistance—God having withdrawn and let Satan prevail—has spread out into the world and persisted to the present day. It has consequently become impossible to understand Paul, and the knowledge of Christ has been inevitably obscured. Even if there had never been any other error in the Church, this one alone was pestilent and potent enough to make havoc of the gospel, and unless a special sort of grace has intervened, Jerome has merited hell rather than heaven for it—so little would I dare to canonize him or call him a saint. It is, then, not true that Paul is speaking only about ceremonial laws; otherwise, how can the argument be sustained by which he concludes that all men are wicked and in need of grace? For someone could say: Granted we are not justified by ceremonial works, yet a person might be justified by the moral works of the Decalogue, so you have not proved by your syllogism that grace is necessary for these. Besides, what is the use of a grace that liberates us only from ceremonial works, which are the easiest of all, and which can at the lowest be extorted from us by fear or self-love? It is, of course, also untrue that ceremonial works are deadly and unlawful since the death of Christ; Paul never said that, but he says they do not justify and are of no advantage to a man in the sight of God as regards setting him free from ungodliness. Once this is accepted, anyone may do them without doing anything unlawful—just as eating and drinking are works that do not justify or commend us to God [I Cor. 8:8], yet a man does nothing unlawful when he eats and drinks.
They are also wrong in that the ceremonial works were as much commanded and required in the old law as was the Decalogue, so that the latter was neither more nor less important than the former. And as Paul is speaking primarily to Jews, as he says in Romans 1[:16], no one need doubt that by works of the law he means all the works of the entire law. For it would be meaningless to call them works of the law if the law were abrogated and deadly, since an abrogated law is no longer a law, as Paul very well knew. He is therefore not speaking of an abrogated law when he speaks of the works of the law, but of the law that is valid and authoritative. Otherwise, how easy it would have been for him to say: 'The law itself is now abrogated!'—then we should have had a clear and unambiguous declaration.
But let us appeal to Paul himself as his own best interpreter, where he says in Galatians 3[:10]: 'All who rely on works of the law are under a curse; for it is written, "Cursed be everyone who does not abide by all things written in the Book of the Law, and do them."' You see here, where Paul is making the same point in the same words as in the epistle to the Romans, that every time he mentions the works of the law he is speaking of all the laws written in the Book of the Law. And what is more remarkable, he actually quotes Moses, who curses those who do not abide by the law [Deut. 27:26], although he himself preaches that those are accursed who rely on the works of the law. He thus makes two contrary statements, the one being negative, the other affirmative. He can do this, however, because the fact is that in the sight of God those who are most devoted to the works of the law are farthest from fulfilling the law, because they lack the Spirit that is the true fulfiller of the law, and while they may attempt it by their own powers, they achieve nothing. So both statements are true and both types are accursed—those who do not abide by the law, as Moses puts it, and those who rely on works of the law, as Paul puts it; for they each lack the Spirit, without whom the works of the law, no matter how much they are done, do not justify, as Paul says [Rom. 3:20], and therefore they do not abide in all the things that are written, as Moses says [Deut. 27:26].
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It can be taken as settled, then, that by works of the law Paul means not simply ceremonial works, but all the works of the law in its entirety. With this it will also be settled that everything connected with the works of the law is condemned if it is without the Spirit.
This passage is striking in its addressing almost the same views now generally held by NPP advocates. Indeed, if I didn't already know that Martin Luther wrote it, I might think that it was written by some modern writer familiar with the work of E. P. Sanders or James Dunn. It's as if Luther had read Sanders and Dunn themselves.
Although Sanders may have gone further than anyone before him in analyzing and characterizing first-century Judaism, his—and, subsequently, James Dunn's and N. T. Wright's—subsequent conclusions about Paul's theology are neither unprecedented nor world-shaking. Indeed, it seems that the "new perspective" on Paul is not a fundamentally new platform but an elaboration on and adaptation of an old one.