That is what my Antinomians, too, are doing today, who are preaching beautifully and (as I cannot but think) with real sincerity about Christ’s grace, about the forgiveness of sin and whatever else can be said about the doctrine of redemption. But they flee as if it were the very devil the consequence that they should tell the people about the third article, of sanctification, that is, of the new life in Christ. They think one should not frighten or trouble the people, but rather always preach comfortingly about grace and the forgiveness of sins in Christ, and under no circumstances use these or similar words, “Listen! You want to be a Christian and at the same time remain an adulterer, a whoremonger, a drunken swine, arrogant, covetous, a usurer, envious, vindictive, malicious, etc.!” Instead they say, “Listen! Though you are an adulterer, a whoremonger, a miser, or other kind of sinner, if you but believe, you are saved, and you need not fear the law. Christ has fulfilled it all!”
Tell me, my dear man, is that not granting the premise and denying the conclusion? It is, indeed, taking away Christ and bringing him to nought at the same time he is most beautifully proclaimed! And it is saying yes and no to the same thing. For there is no such Christ that died for sinners who do not, after the forgiveness of sins, desist from sins and lead a new life. Thus they preach Christ nicely with Nestorian and Eutychian logic that Christ is and yet is not Christ. They may be fine Easter preachers, but they are very poor Pentecost preachers, for they do not preach de sanctificatione et vivificatione Spiritus Sancti, “about the sanctification by the Holy Spirit,” but solely about the redemption of Jesus Christ, although Christ (whom they extoll so highly, and rightly so) is Christ, that is, he has purchased redemption from sin and death so that the Holy Spirit might transform us out of the old Adam into new men—we die unto sin and live unto righteousness, beginning and growing here on earth and perfecting it beyond, as St. Paul teaches. Christ did not earn only gratia, “grace,” for us, but also donum, “the gift of the Holy Spirit,” so that we might have not only forgiveness of, but also cessation of, sin. Now he who does not abstain from sin, but persists in his evil life, must have a different Christ, that of the Antinomians; the real Christ is not there, even if all the angels would cry, “Christi Christi” He must be damned with this, his new Christ. (Luther's Works 41:113–114)
Who hasn't fallen prey to this fallacy? This is why Dr. Luther said, "Hence, whoever knows well this art of distinguishing between Law and Gospel, him place at the head and call him a doctor of Holy Scripture." And why Dr. Walther taught, "To rightly distinguish Law and Gospel is the most difficult and highest Christian art—and for theologians in particular. It is taught only by the Holy Spirit in combination with experience" (Law and Gospel, Thesis III, [St. Louis, MO: CPH, 2006], 49).
HT: Fr. Weslie Odom.