This book is about ecumenism, from a Catholic point of view. The first part, chapters 1 and 2, describe the history of divisions within the Church, as well as of the efforts to bring about Christian unity. The second part examines Ecumenism from a systematic theological perspective. This first part takes into account the different factors that led to definitive ruptures within the Church, which usually are not only theological. The text gives useful information about what happened after the respective divisions as well as about the various attempts to restore unity, the development of the Ecumenical Movement in the 20th Century, and the current situation of ecumenical dialogue within the Catholic Church. While offering insight into the sad history that has led to the present disunity, this work also highlights the way Christians have sought to bring to fulfill the petition of Christ that his disciples might be one, as He and the Father are one. The second part―chapters three, four and five―offers a systematic theological analysis of unity in the Church, from the point of view of dogmatic theology. We find here an explanation of the Catholic concept of ecumenism, of how Catholic theology understands the unity of the Church, and, finally, of the Catholic principles which sustain the efforts for regaining unity in the Church. The Second Vatican Council, and particularly the Constitution Lumen gentium and the Decree Unitatis redintegratio, are at the foundation of these reflections. At the same time, since the theology of the Church and the life of the Church are intimately connected, there is a profound link between this dogmatic section and the earlier historical section. The last chapter, about the practice of ecumenism, is also written from a theological perspective, but with more links with life and spirituality. The chapter recalls that ecumenism can never simply remain a set of theological principles, but rather inspires an attitude and action in charity which are essential to the Christian life.

Contemporary ecumenism is a revival of a Reformation ideal. The Colloquy of Poissy was the last great expression expression of that ideal. At the colloquy, held in 1561 on the eve of the French religious wars, revived Catholicism and emergent international Protestantism met in an attempt to establish peace, unity, and reconciliation of differing viewpoints. A history of this great conference reveals how unfinished was the Reformation and how tragic a turn it had taken.

This work on the colloquy presents the dialectical complexities of the sixteenth-century theology—a theology that had emerged with binding strands of religious idealism and political interest. Theology was, indeed, the medium of discourse, but it was not an end in itself. Rather, it was a means to a higher goal: religious reconciliation.

The present analysis, therefore, is not so much a study in the abstractions of theology as it is a study in ecumenism. Poissy is placed in a larger historical background and the author carefully and critically weighs all factors which affected the chances for religious unity. Within this larger context, he argues that the colloquy placed the participants at the final crossroads of the Reformation. When it was over the Reformation was sealed and the Counter-Reformation signaled.

Donald Nugent’s approach is revisionist; his theological orientation is Erasmian, ecumenical, and speculative. He shows that ecumenism has been effectively and banefully excised from historiography and argues that it must be reintegrated into the story of the Reformation. Because we live in a new age of ecumenism, the author’s insights and conclusions are especially appropriate. We have now that keen and historical dimension which cannot but help illuminate contemporary life.