New Thought has been defined as "an attitude of mind, not a cult." It is really both. It is necessary to include it in this study because it is a cult; it is hard justly to appraise it because it is an attitude of mind. Attitudes of mind are as elusive as the play of light on running water. We can estimate their force and direction only as we have an understanding of the main currents of thought by which they are carried along and as far as New Thought goes these main currents are far older than the cult itself. _New Thought Difficult to Define; "An Attitude of Mind, Not a Cult"_ New Thought has never had an apostolic succession or a rigid discipline or a centralized organic form. This has given to it a baffling looseness in every direction, but has, on the other hand, given it a pervasive quality which Christian Science does not possess. It has a vast and diffuse literature and so merges into the general movement of contemporaneous thought as to make it difficult to find anywhere a distinct demarcation of channels. New Thought is either a theology with a philosophic basis or a philosophy with a theological bias. It is centrally and quite distinctly an attempt to give a religious content to the present trend of science and philosophy, a reaction against old theologies and perhaps a kind of nebula out of which future theologies will be organized. For a great theology is always the systematic organization of a complex of forces, a massive structure wrought through the years by manifold builders subduing a rich variety of material to their purposes. The teaching of the Scriptures, old traditions, the needs of worship and organization, political and social circumstances, changing moral ideals, the trend of philosophies and sciences, the challenge of schisms and heresies, the sanctifying power of blind custom and the mystical authority of the Church itself all combine to make a theology. Once a great theology is so constituted it possesses an immense power over life. It shapes character and ideals and gives direction to faith, orders effort and so becomes, as it were, a mould into which souls and societies are cast. Theologies may be changed, in fact they are always in the way of being changed, but they yield slowly to transforming forces. Nothing is so persistent as organized faith and yet the very strength of a great theology is always its weakness. It is never really anything else than a crystallization of past forces. The experiences which voice themselves in theology have cooled and hardened down; the philosophy which is implicit in theology is past philosophy; the science implicit in theology is senescent science.