This text touches the very pith of Paul’s chief doctrine. The cause why it is well understood but by few is, not that it is so obscure and difficult, but because there is so little knowledge of faith left in the world; without which it is not possible to understand Paul, who everywhere treats of faith with such earnestness and force. I must, therefore, speak in such a manner that this text will appear plain; and that I may more conveniently illustrate it, I will speak a few words by way of preface.

First, therefore, we must understand the doctrine in which good works are set forth, far different from that which treats of justification; as there is a great difference between the substance and its working; between man and his work. Justification pertains to man, and not to works; for man is either justified and saved, or judged and condemned, and not works. Neither is it a controversy among the godly, that man is not justified by works, but righteousness must come from some other source than from his own works: for Moses, writing of Abel, says, “The Lord had respect unto Abel, and to his offering.” First, He had respect to Abel himself, then to his offering; because Abel was first counted righteous and acceptable to God, and then for his sake his offering was accepted also, and not he because of his offering. Again, God had no respect to Cain, and therefore neither to his offering: therefore thou seest that regard is had first to the worker, then to the work.

From this it is plainly gathered that no work can be acceptable to God, unless he which worketh it was first accepted by Him: and again, that no work is disallowed of Him unless the author thereof be disallowed before. I think these remarks will be sufficient concerning this matter at present, by which it is easy to understand that there are two sorts of works, those before justification and those after it; and that these last are good works indeed, but the former only appear to be good. Hereof cometh such disagreement between God and those counterfeit holy ones; for this cause nature and reason rise and rage against the Holy Ghost; this is that of which almost the whole Scripture treats. The Lord in His Word defines all works that go before justification to be evil, and of no importance, and requires that man before all things be justified. Again, He pronounces all men which are unregenerate, and have that nature which they received of their parents unchanged, to be righteous and wicked, according to that saying “all men are liars,” that is, unable to perform their duty, and to do those things which they ought to do; and “Every imagination of the thoughts of his heart are only evil continually”; whereby he is able to do nothing that is good, for the fountain of his actions, which is his heart, is corrupted. If he do works which outwardly seem good, they are no better than the offering of Cain.

Here again comes forth reason, our reverend mistress, seeming to be marvelously wise, but who indeed is unwise and blind, gainsaying her God, and reproving Him of lying; being furnished with her follies and feeble honor, to wit, the light of nature, free will, the strength of nature; also with the books of the heathen and the doctrines of men, contending that the works of a man not justified are good works, and not like those of Cain, yea, and so good that he that worketh them is justified by them; that God will have respect, first to the works, then to the worker. Such doctrine now bears the sway everywhere in schools, colleges, monasteries wherein no other saints than Cain was, have rule and authority. Now from this error comes another: they which attribute so much to works, and do not accordingly esteem the worker, and sound justification, go so far that they ascribe all merit and righteousness to works done before justification, making no account of faith, alleging that which James saith, that without works faith is dead.

This sentence of the apostle they do not rightly understand; making but little account of faith, they always stick to works, whereby they think to merit exceedingly, and are persuaded that for their work’s sake they shall obtain the favor of God: by this means they continually disagree with God, showing themselves to be the posterity of Cain. God hath respect unto man, then unto the works of man; God alloweth the work for the sake of him that worketh, these require that for the work’s sake the worker may be crowned.

But here, perhaps, thou wilt say, what is needful to be done? By what means shall I become righteous and acceptable to God? How shall I attain to this perfect justification? Those the gospel answers, teaching that it is necessary that thou hear Christ, and repose thyself wholly on Him, denying thyself and distrusting thine own strength; by this means thou shalt be changed from Cain to Abel, and being thyself acceptable, shalt offer acceptable gifts to the Lord. It is faith that justifies thee, thou being endued therewith; the Lord remitteth all thy sins by the mediation of Christ His Son, in whom this faith believeth and trusteth. Moreover, He giveth unto such a faith His Spirit, which changes the man and makes him anew, giving him another reason and another will. Such a one worketh nothing but good works. Wherefore nothing is required unto justification but to hear Jesus Christ our Savior, and to believe in Him. Howbeit these are not the works of nature, but of grace.

He, therefore, that endeavors to attain to these things by works shutteth the way to the gospel, to faith, grace, Christ, God, and all things that help unto salvation. Again, nothing is necessary in order to accomplish good works but justification; and he that hath attained it performs good works, and not any other. Hereof it sufficiently appears that the beginning, the things following, and the order of man’s salvation are after this sort; first of all it is required that thou hear the Word of God; next that thou believe; then that thou work; and so at last become saved and happy. He that changes this order, without doubt is not of God. Paul also describes this, saying, “Whosoever shall call upon the name of the Lord shall be saved. How then shall they call on Him in whom they have not believed? and, how shall they believe in Him of whom they have not heard? and, how shall they hear without a preacher? and, how shall they preach except they be sent?”

Read Luther’s sermon in its entirety HERE.

(Excerpt from Luther’s sermon titled “The Method and Fruits of Justification”. Public Domain, originally published in the multivolume set, The World’s Greatest Sermons, compiled by Grenville Kleiser, New York: Funk & Wagnalls Company, 1908.)