Henry P. Van Dusen has been a leader in the ecumenical movement and a witness to the “axioms” of its history which he describes. Educated at Princeton University, the University of Edinburgh, and Union Theological Seminary in New York, he taught for many years at Union and served as its President for eighteen years until 1963. He is the author of several books, including World Christianity: Yesterday and Tomorrow (1947), One Great Ground of Hope: Christian Missions and Christian Unity (1961), and The...