The Fathers of the Church are of great importance for the dialogue between protestant and orthodox churches. While the former have learnt about the ecumenical impact of the patristic period, the latter are confronted with the shape and content of reformation theology. For nearly three decades, Wolfgang Bienert has participated in the dialogue of the German Protestant Churches with the Ecumenical Patriarchate of Constantinople. Regularly, he has published his lectures and also made remarks on success and failures of the meetings. The select studies may be read as a concise summary of method and matter of the protestant-orthodox dialogue. Additionally, the volume presents papers which deal with the general importance of the Fathers for Protestantism and Ecumenism, as well with Lutheran missionary theology. German text.