With 2017 marking the 500th anniversary of the Reformation, on October 31, 2016, Pope Francis will take part in an ecumenical event in Lund, Sweden. Cardinal Kasper's new book, based on a lecture at Humboldt University in Berlin, emphasizes how relevant Luther's message is for Christians of all denominations. Luther's message of divine mercy was his answer to his own problems and to the questions of his time, as it is now to us in our times.