" Finally, arguing that antisemitism means exhibiting hostility toward all “Semitic” peoples obscures the meaning that has been ascribed to it for virtually all its history. Wilhelm Marr, a German journalist who was a Jew-hater, popularized the term in the late nineteenth century. He contended that Jews, including those who had converted to Christianity, were incapable of assimilating. Once a Jew, always a Jew. According to Marr, Jews were dangerous because their goal was “to harm Germanic identity” and to destroy “the Germanic.” Nothing could alter their foreign-ness, including changing their religion. "
― Deborah E. Lipstadt , Antisemitism: Here and Now