Some scholars, such as Mark U. Edwards in his book Luther's Last Battles: Politics and Polemics 1531–46 (1983), suggest that since Luther's increasingly antisemitic views developed during the years his health deteriorated, it is possible they were at least partly the product of a declining state of mind. Edwards also comments that Luther often deliberately used "vulgarity and violence" for effect, both in his writings condemning the Jews and in diatribes against "Turks" (Muslims) and Catholics.