It is to be borne in mind that throughout the course of development of belief, from the beginning of hecastotheism into the borderland of psychotheism, the dominant characteristic is the vague notion of mystery. At first the mystery pervades all things and extends in all directions, representing an indefinite ideal world, which is the counterpart of the real world with the addition of human qualities. Gradually the mystery segregates, deepening with respect to animals and disappearing with respect to inanimate things; and at length the slowly changing mysteries shape themselves into semiabstractions having a strong anthropic cast, while the remainder of the earth and the things thereof gradually become real, though they remain under the spell and dominion of the mysterious. Thus at every stage the primitive believer is a mystic—a fatalist in one stage, a beast worshiper in another, a thaumaturgist in a third, yet ever and first of all a mystic. It is also to be borne in mind (and the more firmly because of a widespread misapprehension) that the primitive believer, up to the highest stage attained by the North American Indian, is not a psychotheist, much less a monotheist. His "Great Spirit" is simply a great mystery, perhaps vaguely anthropomorphic, oftener zoomorphic, yet not a spirit, which he is unable to conceive save by reflection of the white man’s concept and inquiry; and his departed spirit is but a shade, much like that of the ancient Greeks, the associate and often the inferior of animal shades.