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Concerning Christian Liberty
But you will ask, What is this word, and by what means is it to be used, since there are so many words of God? I answer, The Apostle Paul (Rom. i.) explains what it is, namely the Gospel of God, concerning His Son, incarnate, suffering, risen, and glorified, through the Spirit, the Sanctifier. To preach Christ is to feed the soul, to justify it, to set it free, and to save it, if it believes the preaching. For faith alone and the efficacious use of the word of God, bring salvation. "If thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised Him from the dead, thou shalt be saved" (Rom. x. 9); and again, "Christ is the end of the law for righteousness to every one that believeth" (Rom. x. 4), and "The just shall live by faith" (Rom. i. 17). For the word of God cannot be received and honoured by any works, but by faith alone. Hence it is clear that as the soul needs the word alone for life and justification, so it is justified by faith alone, and not by any works. For if it could be justified by any other means, it would have no need of the word, nor consequently of faith.
But this faith cannot consist at all with works; that is, if you imagine that you can be justified by those works, whatever they are, along with it. For this would be to halt between two opinions, to worship Baal, and to kiss the hand to him, which is a very great iniquity, as Job says. Therefore, when you begin to believe, you learn at the same time that all that is in you is utterly guilty, sinful, and damnable, according to that saying, "All have sinned, and come short of the glory of God" (Rom. iii. 23), and also: "There is none righteous, no, not one; they are all gone out of the way; they are together become unprofitable: there is none that doeth good, no, not one" (Rom. iii. 10-12). When you have learnt this, you will know that Christ is necessary for you, since He has suffered and risen again for you, that, believing on Him, you might by this faith become another man, all your sins being remitted, and you being justified by the merits of another, namely of Christ alone.
Since then this faith can reign only in the inward man, as it is said, "With the heart man believeth unto righteousness" (Rom. x. 10); and since it alone justifies, it is evident that by no outward work or labour can the inward man be at all justified, made free, and saved; and that no works whatever have any relation to him. And so, on the other hand, it is solely by impiety and incredulity of heart that he becomes guilty and a slave of sin, deserving condemnation, not by any outward sin or work. Therefore the first care of every Christian ought to be to lay aside all reliance on works, and strengthen his faith alone more and more, and by it grow in the knowledge, not of works, but of Christ Jesus, who has suffered and risen again for him, as Peter teaches (1 Peter v.) when he makes no other work to be a Christian one. Thus Christ, when the Jews asked Him what they should do that they might work the works of God, rejected the multitude of works, with which He saw that they were puffed up, and commanded them one thing only, saying, "This is the work of God: that ye believe on Him whom He hath sent, for Him hath God the Father sealed" (John vi. 27, 29).