Tributes to Paul Tillich: Paul Tillich's impact on America, by J. C. Brauer. The sources of Paul Tillich's richness, by W. Pauck. Paul Tillich and the history of religions, by M. Eliade.--Essays by Paul Tillich: The effects of space exploration on man's condition and stature. Frontiers. The decline and the validity of the idea of progress. The significance of the history of religions for the systematic theologian