“Source, please, where Luther says this.”
Read his works. His entire creed was “faith alone” and “predestination” with no room for works and free will. Hence John Esp
His position on Revelations was: "In the 16th century, Martin Luther initially considered it to be “neither apostolic nor prophetic” and stated that “Christ is neither taught nor known in it,” and placed it in his Antilegomena (his list of questionable documents), though he retracted this view in later life.
“Luther himself took the liberty of criticizing some of these books in a polemical manner which few Lutherans today would find completely acceptable. He had a low view of Hebrews, James, Jude, and the Revelation, and so when he published his New Testament in 1522 he placed these books apart at the end. In his Preface to Hebrews, which comes first in the series, he says, “Up to this point we have had to do with the true and certain chief books of the New Testament. The four which follow have from ancient times had a different reputation”.” From: Luther’s Treatment of the ‘Disputed Books’
of the New Testament at: bible-researcher.com/antilegomena.html
“The undue importance he had placed on his own strength in the spiritual process of justification, he now peremptorily and completely rejected. He convinced himself that man, as a consequence of original sin, was totally depraved, destitute of free will, that all works, even though directed towards the good, were nothing more than an outgrowth of his corrupted will, and in the judgments of God in reality mortal sins. Man can be saved by faith alone. Our faith in Christ makes His merits our possession, envelops us in the garb of righteousness, which our guilt and sinfulness hide, and supplies in abundance every defect of human righteousness.”
"14 What shall it profit, my brethren, if a man say he hath faith, but hath not works? Shall faith be able to save him?
15 And if a brother or sister be naked, and want daily food:
16 And one of you say to them: Go in peace, be ye warmed and filled; yet give them not those things that are necessary for the body, what shall it profit?
17 So faith also, if it have not works, is dead in itself.
18 But some man will say: Thou hast faith, and I have works: shew me thy faith without works; and I will shew thee, by works, my faith.
19 Thou believest that there is one God. Thou dost well: the devils also believe and tremble.
20 But wilt thou know, O vain man, that faith without works is dead?
21 Was not Abraham our father justified by works, offering up Isaac his son upon the altar?
22 Seest thou, that faith did co-operate with his works; and by works faith was made perfect?
23 And the scripture was fulfilled, saying: Abraham believed God, and it was reputed to him to justice, and he was called the friend of God.
24 Do you see that by works a man is justified; and not by faith only?
25 And in like manner also Rahab the harlot, was not she justified by works, receiving the messengers, and sending them out another way?
26 For even as the body without the spirit is dead; so also faith without works is dead."
This makes Martin Luther’s creed of Faith Alone (Soli Fidelis) look rather silly, don’t you think?