Or take, for example, the dew, which he sees appearing and disappearing, he cannot tell whence or whither; the stars which are lighted in the evening, and put out again at morning; the clouds which gather all of a sudden, and of a sudden are dispersed; the rain, the wind, the currents in the water—must not all these arouse in him the thought or conception of visible and invisible existences? When the primitive Eskimo first met with the glacier which he saw gliding out into the sea, and giving birth, from time to time, to mighty icebergs, could he see in this anything else than the activity of a live being? He attributed life to the thing itself, and regarded these monstrous births as voluntary and awe-inspiring actions.

Or, to take another example, when a primitive man saw his own shadow or his own image in the water, now here, now gone again, eluding alike his touch and his grasp, how could this fail to arouse in him the conception of tangible and intangible existences, things that could now be here and at the next moment could vanish away?

There were plenty of grounds, in short, for the evocation of the idea of duality in nature, of a visible and an invisible phase of existence. But this belief in the duality of nature must have been greatly strengthened by the primitive man’s conceptions of himself. When he slept, and dreamed that he was out hunting, was dancing, was visiting others, in short, was wandering far and wide, and then awoke and discovered that his body had not moved from his cave or hut, and heard his wife or his companions corroborate this, he naturally could not but believe that he consisted of two parts, of one part which could leave him at night and go through all these experiences, and one which lay still at home. To distinguish between dreams and reality was far more than could be expected of him. The speech of many primitive races cannot to this day, as Spencer points out, express this distinction, having no means of saying ‘I dreamed that I saw’ instead of ‘I saw.’ When he had further noticed that his shadow followed him by day but not by night, it was quite natural that he should give to the part that was separable from him the name of ‘shadow’ or ‘shade,’ which, therefore, came to mean the same thing which others denominate soul or spirit. We shall presently see that the Eskimo has acquired in this way his belief in, and his name for, the soul. The conviction of his own kinship with all the objects around him is further strengthened by the observation that they have shadows as well as himself.

But when primitive man was brought face to face with death it must have made a powerful impression upon him, and the belief in his own duality must have been confirmed in a still higher degree. Here, he saw, was the same body, the same mouth, and the same limbs; the only difference was that in life they spoke and moved, whereas now all was still. Their speech and motion must be due to some life-giving principle, and this must of course be the soul, which, as he knew from dreams, had the power of quitting the body. We must also hold it only natural that the soul, which at death departed from the body, came to be associated with the breath of the mouth, which was now gone; and therefore (as for example among some of the Eskimos) man was endowed with two souls, the shadow and the breath. This belief in the duality of the soul, which is sometimes also traceable to the shadow and the reflection in the mirror, is very widely spread, and to it we may probably trace our own distinction between soul and spirit, psyche and pneuma.

It might at first sight seem natural for primitive man to conclude that the soul no less than the body dies at death. There are, in fact, some who think so; but most of them, on meeting the dead again in their dreams, were driven to the conclusion that their souls still lived. Furthermore, it was not at all difficult to conceive that, as the soul was temporarily absent from the body in sleep, delirium, and so forth, it was permanently absent in death. Thus the belief in the continued life of the soul has quite naturally and inevitably arisen; and as the idea of annihilation is very unattractive to every living creature, this conception of immortality has appealed forcibly to the human mind.

But as most men are afraid of death and of the dead, they do not like to meet them again as ghosts; and, terror stimulating the imagination, a supernatural power is attributed to them, mainly hurtful, but sometimes helpful as well. People therefore come to think it wisest to propitiate and make friends with them. Thus has arisen that worship of the dead which plays so great a part in the religion of most races, and which lies, if not at the foundation, at any rate, very near to it, in almost all religions—as, for instance, among the Eskimos.

It cannot be thought unnatural that the spirits of the dead, and especially those of the more eminent among them, such as chiefs and princes, were gradually converted into gods.

The word for God among the Hebrews (il or el), among the Egyptians (nutar), and among many other peoples, meant only a powerful being, and could be applied as well to heroes as to gods. As there were upon the earth peculiarly powerful men, so there must be in the spirit-world peculiarly powerful spirits; and these naturally became the divinities par excellence whom it was specially important to worship. Thus we arrive at last at the belief in one God, at the moment when absolute monarchy is established in the spirit world.

But alongside of this ancestor-worship, we recognise as a powerful factor in the development of superstitious ideas the marked tendency of the human race to attribute supernatural power to certain inanimate objects, which, in the primitive stage, are used to avert or influence the power of the dead or to attain other advantages; and from this has developed the whole widespread belief in amulets, and possibly also, in a measure, fetish-worship. We shall consider later how the belief in the power of the amulet may have arisen.

An important force tending towards the continuance and development of superstitious conceptions, when they have once arisen, is of course to be found in the authority of the medicine-men (spirit-exorcisers), or of the priests, over their fellow-men. Some minds, and these the ablest, naturally came to have a better understanding than the others of supernatural things, and to stand in a closer relation to the dead. It was clear that they could thus help their neighbours, when, for example, there was question of applying the powers of the dead to the benefit of an individual or of a body of men; and the priest thus attained power and influence in the community, and often advantages of a more material nature as well. It has thus always been to the interest of the medicine-men and priests to sustain and nurture superstitious or religious ideas. They must themselves appear to believe in them; they may even discover new precepts of divinity to their own advantage, and thereby increase both their power and their revenues.