Paul Elmer More's philosophy was self-styled ‘dualism’, and because developed initially from a student's enthusiasm instigated by a book on Manicheism, has often been misinterpreted. In this paper, on the basis of More's long development, I shall try to survey the nuances of his ‘dualism’ or ‘dualisms’, the various aspects of ‘dualism’ which he developed largely through case studies of thinkers of the past. In a significant way, to parody William James, the Shelburne Essays might well be called ‘The Varieties of Dualistic Experience’, and of course for More ‘dualistic’ was virtually a synonym for ‘religious’. Out of these studies issued a Christian Platonism, or more precisely, a philosophy of the Incarnation, particularly in Christ the Word. The subsequent volume in a series called ‘The Greek Tradition: From the Death of Socrates to the Council of Chalcedon’ is The Catholic Faith. Although More called his dualism ‘absolute’, and it is sometimes presented as ‘absolute dualism’, the ‘sacramental idea’ at the heart of Christianity is said to rest ‘ultimately upon a dualistic conception of the world, in accordance with which matter and spirit are essentially distinct yet mutually interdependent. It implies on the one side that matter can be indefinitely adapted to spiritual uses, and on the other side that spirit requires now, and, so far as our knowledge and imagination reach, will always require the aid of some sort of corporeal instruments. It points to a divine purpose unfolding itself in a continuous process wherein the stuff of existence is…transmuted into an ever finer medium of order and beauty and righteousness and joy.