The author, of the faculty of the University of Geneva, is concerned about the apparent impasse that is reached, sooner or later, in conversations between Protestants and Roman Catholics. He finds the source of this difficulty in the difference between the two types of spirituality which inform the outlook of each. The types of these spiritualities he finds in Abraham and Moses. Abraham as the man of faith and venture represents the direct interior awareness of God, and is characteristic of the Protestant outlook; while Moses is the mediator of a Transcendent God who localizes His presence in the historical institution, and in this respect represents the Roman Catholic outlook. The distinction between the two types is developed, first, from consideration of the Old Testament accounts, and then from the usage made of these accounts in the New Testament, particularly by Paul. Although both Protestants and Roman Catholics read the same Scripture, because of these divergent spiritualities, they do not read Scripture the same. The author is hopeful that current Biblical critical studies may serve to open a new basis for rapprochement between the two branches of the Church. Although purporting to be written for laymen, the level of Biblical citation and exegesis probably is better suited to students and Biblical scholars.