This article discusses William James's notion, propounded in his "Varieties of Religious Experience" (1902), that authentic religious experience should be evidenced in mature moral functioning--"the value of saintliness". Support for this and his other ideas relevant to the intersection of morality and religion was adduced from a review of current research, which examined the following topics: the faith commitments of actual moral exemplars; the religious reasoning of people in handling moral problems; the personality profiles ascribed to moral, religious and spiritual exemplars; the asymmetrical relationships evidenced across the moral, religious and spiritual domains; and the different dimensions evident in people's typologies of these domains. This analysis led to the conclusion that James has made a significant contribution to the psychology of moral development by arguing for the importance of religious experience in moral functioning.