In times when Christians call for war, being a peacemaker can seem like heresy.

For eight days in Lent (6 March 1522), beginning on Invocavit Sunday, 9 March, Luther preached eight sermons, which became known as the Invocavit Sermons. In these sermons, he hammered home the primacy of core Christian values such as love, patience, charity, and freedom, and reminded the citizens to trust God's word rather than violence…