http://ic.net/~erasmus/RAZ325.HTM
Of special noteworthiness and relevance is Luther's Preface to the New Testament (1522; revised 1545), where he says many astonishing, outrageously presumptuous and foolish things (including the famous "epistle of straw" remark). After expounding generally for a few pages, the alleged restorer of the gospel concludes:
From all this you can now judge all the books and decide among them which are the best.
. . . John's Gospel is the one, tender, true chief Gospel, far, far to be preferred to the other three and placed high above them. So, too, the Epistles of St. Paul and St. Peter far surpass the other three Gospels -- Matthew, Mark, and Luke.
In a word, St. John's Gospel and his first Epistle, St. Paul's Epistles, especially Romans, Galatians and Ephesians, and St. Peter's first Epistle are the books that show you Christ and teach you all that is necessary and good for you to know, even though you were never to see or hear any other book or doctrine.
Therefore St. James' Epistle is really an epistle of straw, compared to them; for it has nothing of the nature of the Gospel about it.
(Jacobs, ibid., 443-444)