A life dedicated to ecumenism – this summarizes the entire theological work of Otto Hermann Pesch. His monumental "Catholic Dogmatics from Ecumenical Experience" impressively underscores this. Following this work, and also in part through critical engagement with it, the authors of the present volume examine the prerequisites, argumentative structures, and future viability of Otto Hermann Pesch's theological approach. It becomes clear that he makes a pioneering contribution, particularly in the confessionally challenging relationship between faith, tradition, and church, paving the way for unity among the churches.