Another classification, not less open to suspicion than that of Von Hartmann, is the celebrated Comtist progression from fetichism to polytheism and from polytheism to monism. In this classification the framework no longer consists of metaphysical abstractions, but of numbers. But numbers also possess their artificial and superficial side; they do not express the most fundamental aspects of religion. In the first place, it is a matter of extreme difficulty to perceive any radical difference between naturistic fetichism and polytheism. Multiplicity of divinities is a characteristic common to both. The sole difference that Comte was able to establish is that in polytheism a whole class of objects, for example all the trees of a forest, or a whole class of phenomena, as lightning and storm, is represented by one divinity. But this species of abstraction and generalization is much less important, much more exterior and purely logical, than the psychological and metaphysical progression from a grossly unitarian and concrete naturism to a dualistic animism. This latter line of development is in the direction of naturalistic and spiritualistic metaphysics, which possess a deeper significance than a system of mathematical enumeration and logical generalization. The passage from polytheism to monotheism is also conceived by Comte somewhat too mathematically. Polytheism early resulted in a certain hierarchy and subordination of the whole body of individual deities to some one powerful god: Jupiter, Fate, etc. On the other hand, monotheism has always provided some place for secondary divinities—angels, devils, spirits of every kind, to say nothing of the trinitarian conception of the Godhead itself. Mathematical terms, in this connection, obscure profound problems which belong really to metaphysics and to morals. [Sidenote: The real classification.] From the point of view of metaphysics the great question is that of the relation which exists between the divinity and the world and mankind; a relation of immanence or of transcendence, of duality or of unity. We have seen that, from this point of view, religions have passed from an extremely vague primitive immanence to a relation of transcendence and of separation, ultimately to return, sometimes with comparative rapidity (as in India), sometimes very slowly (as among Christian nations), to the notion of an immanent God in whom we live and move and have our being. [Sidenote: Progressive encroachment of deterministic conception.]