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https://blog.oup.com/2017/03/extract-lu ... formation/
e. All Biblical prophets, he wrote, had foretold ‘that the Jews will vilify and blaspheme against God and their King Jesus’ (maledicturos et blasphematuros). But the Scriptures had to be fulfilled; to prevent the blasphemies of the Jews was the same as claiming that the Bible was telling lies:
[F]or through the wrath of God they [the Jews] are condemned to being incapable of improvement, as the Preacher says (Ecclesiastes 1, 15), and any attempt at improving those who are incapable of improvement only makes them worse and never better.
From 1518 onwards Luther in various published writings had identified a closer connection between himself and Reuchlin and occasionally compared his own fate with his, although in the summer of 1521 he made a comment that dispelled any doubt that he considered the ‘Jewish books’ Reuchlin had tried to defend to be utterly base; he even confessed that he had been ashamed ‘that so much has been made of these worthless things [. . .] in the name of Christianity’. Luther’s firm theological convictions regarding the Jews, namely that they were the objects of God’s wrath, were corrupt, blasphemers of Christ, and followed worthless rabbinical interpretations that confirmed them in their errors, did not prevent him from making a stand in support of the great Hebrew scholar and advocate of Jewish rights.