Luther came to understand justification as entirely the work of God. This teaching by Luther was clearly expressed in his 1525 publication On the Bondage of the Will , which was written in response to On Free Will by Desiderius Erasmus (1524). Luther based his position on predestination on St. Paul's epistle to the Ephesians 2:8–10 . Against the teaching of his day that the righteous acts of believers are performed in cooperation with God, Luther wrote that Christians receive such righteousness entirely from outside themselves; that righteousness not only comes from Christ but actually is the righteousness of Christ, imputed to Christians (rather than infused into them) through faith. 
From 1531–1546, Martin Luther’s health deteriorated as he sought to struggle with growing conflict in the Reformation Movement and the constant fear of arrest by the authorities. As his health deteriorated, Martin Luther’s writings became more polemic and vitriolic in condemnation of other people. In these final years, he spent more time writing anti-Semitic tracts. At first, he wished to see the Jewish people converted to Christianity. But, when they seemed uninterested in conversion, he called for the force-able removal of Jews from Germany. This strong anti-Semitic stance has coloured his reputation as a reformer.