Magisterial in the astonishingly wide sweep of the author's learning, brilliant in the frequent originality of his judgments, this fourth out of the total of five volumes in his survey of Christendom and its characteristics and relations is, if anything, even more important and more readable than its distinguished predecessors. In this remarkable survey of the "types of religious man", the writer never departs from a sympathetic understanding of the Christian, nor from a vivid appreciation of the deeply personal, human qualities involved in his nature as an individual.