In 2017, Catholics and Lutherans will jointly look back on events of the Reformation 500 years ago. At the same time, they will also reflect on 50 years of official ecumenical dialogue on the worldwide level. During this time, the communion they share anew has continued to grow. This encourages Lutherans and Catholics to celebrate together the common witness to the Gospel of Jesus Christ, who is the center of their common faith. Yet, amidst this celebration,...