Preface to Romans, b

After the first three chapters, in which sin is revealed and faith’s way to righteousness is taught, St. Paul begins in chapter 4 to meet certain remonstrances and objections. First he takes up the one that all men commonly make when they hear that faith justifies without works. They say, “Are we, then, to do no good works?” Therefore he himself takes up the case of Abraham, and asks, “What did Abraham accomplish, then, with his good works? Were they all in vain? Were his works of no use?” He concludes that Abraham was justified by faith alone, without any works, so much so that the Scriptures in Genesis 15[:6] declare that he was justified by faith alone even before the work of circumcision. But if the work of circumcision contributed nothing to his righteousness, though God had commanded it and it was a good work of obedience, then surely no other good work will contribute anything to righteousness. Rather, as Abraham’s circumcision was an external sign by which he showed the righteousness that was already his in faith, so all good works are only external signs which follow out of faith; like good fruit, they demonstrate that a person is already inwardly righteous before God.

With this powerful illustration from the Scriptures, St. Paul confirms the doctrine of faith which he had set forth in chapter 3. He cites also another witness, David, who says in Psalm 32[:1–2] that a man is justified without works—although he does not remain without works when he has been justified. Then he gives the illustration a broader application, setting it over against all other works of the law. He concludes that the Jews cannot be Abraham’s heirs merely because of their blood, still less because of the works of the law; they must inherit Abraham’s faith, if they would be true heirs. For before the law—before the law of Moses and the law of circumcision—Abraham was justified by faith and called the father of all believers. Moreover the law brings about wrath rather than grace, because no one keeps the law out of love for it and pleasure in it. What comes by the works of the law is thus disfavor rather than grace. Therefore faith alone must obtain the grace promised to Abraham, for these examples too were written for our sakes [Rom. 15:4], that we too should believe.

Luther, M. (1999, c1960). Vol. 35: Luther's works, vol. 35 : Word and Sacrament I (J. J. Pelikan, H. C. Oswald & H. T. Lehmann, Ed.). Luther's Works (Vol. 35, Page 373-374). Philadelphia: Fortress Press.