Responding to a world of contemporary unbelief, Dr. Henrikas Zukauskas examines the work of French Catholic theologian, Yves Congar, who developed a theology of the Holy Spirit by embracing the realities and struggles of the church. This groundbreaking work goes beyond the usual examination of Congar's ecclesiology and ecumenism to highlight the importance of the relation between the Holy Spirit and the world in his theology. Zukauskas undertakes a historical-theological reading of Congar through the three major stages of reform in the church, tradition, and the Holy Spirit, all of which are marked by accumulation and rift. A deeper appreciation of the Spirit invites humanity and the world into the tripartite dialogue of God, world, and humanity. This innovative study is an essential read for scholars, theologians, and those interested in the role of the Spirit in creating space for free human and cosmic activity as participation in God.