This paper discusses the works of Rudolf Otto. Otto was a product of the German scientific seminar system and also of copious studies in theology. Discussed are Otto's landmark piece, The Idea of the Holy. Other topics discussed are: the rational and the non-rational, nature and manifestations of the holy, the sacred and the profane, Otto's three dimensions of the holy and religion and the human condition. 13 pgs. 11 f/c. 7b.