“The Reformers understood justification to be purely preached when the Word is "rightly handl[ed]" (2 Tim. 2:15). A part of using the Word properly involves recognizing that it has two elements: law and gospel. The law is to be preached in all its terror, while the gospel is to be preached in all its comfort as that which the law cannot do (Rom. 8:3-4; CD, 3/4.6). Simply put, the Reformers taught us to preach Christ crucified (1 Cor. 1:23). If a church preaches any other "gospel," whether it is explicitly faith plus works or some insidious version of "get in by faith, stay in by obedience," it is not in conformity with the "teaching of Christ" (2 John 9) but with that of
an antichrist counterfeit. Anything other than the doctrine of justification soles fide is what Paul termed "a different gospel" (Gal. 1:6), which brings with it an eternal anathema (Gal. 1:8-9).”