I have already had occasion to refer to one of the gods of Babylonia, En-lil or El-lil of Nippur.(232) His worship goes back to the earliest period of Babylonian history; his sanctuary at Nippur was one of the oldest in the land. He belongs to the period when the Sumerian was still supreme, and the name he bore was the Sumerian title of En-lil, "the lord of the ghost-world." But it was a title only; the "lord of the ghosts" was himself a ghost, albeit the chief among them.
The fact must be kept carefully in mind. As yet there was no god in the proper sense of the term. The superhuman powers that were dreaded and propitiated were ghosts only, like the ghosts of dead men; and, like the latter, they were denizens of the grave and the underground world. It was only at night that they emerged from their retreat, and terrified the passer-by. Primitive man fears the dark as much as does the child; it is then that the powers of evil are active, and spiritual or supernatural foes lurk behind every corner ready to injure or destroy him. The ghosts of the night are accordingly objects of terror, harmful beings from whom all forms of sickness and insanity are derived.
But even these ghosts can be controlled by those who know the magic words or the mystic rites which they are compelled to obey. Between the ghost and his victim the sorcerer or medicine-man can interpose, and by means of his spells force the spirit to quit the body of the sufferer or enter the body of an enemy. By the side of the ghost, therefore, stands the sorcerer, who is at once the master and the minister of the spirit-world.
With the progress of civilisation an organised body of sorcerers necessarily grows up. But an organised body of sorcerers also implies an organised body of spirits, and an organised system of controlling them. The spells and charms which have been handed down from the past are formed into a system, and the spirits themselves are classified and defined, while special functions are assigned to them. The old unorganised animism passes into an organised shamanism, such as still prevails among certain Siberian tribes. The sorcerer is on the high road to becoming a priest.
Between the sorcerer and the priest, however, there is a gulf too wide to be spanned. The religious conceptions presupposed by them differ in kind as well as in degree. The nature of the superhuman beings by whom man is surrounded, and the relations which he bears to them, are essentially different in the two cases. The priest may also be a sorcerer, but the sorcerer cannot be a priest.