October 31, 2017, marks the 500th anniversary of the beginning of the Lutheran Reformation. On All Saints evening (all hallowed eve, or Hallowe’en) in 1517, Martin Luther, an obscure Augustinian monk living in a remote town in the northeastern part of what was then a part of the Holy Roman Empire, posted Ninety-Five Theses, or statements, for discussion. “I believe that by my understanding or strength I cannot believe in Jesus Christ my Lord or come to him, but instead the Holy Spirit has called me through the gospel, enlightened me with his gifts, made me holy and kept me...