Unlike the gods of the Semites, the “spirits” of the Sumerian were not moved by human passions. They had, in fact, no moral nature. Like the objects and forces they represented, they surrounded mankind, upon whom they would inflict injury or confer benefits. But the injuries were more frequent than the benefits; the sum of suffering and evil exceeds that of happiness in this world, more especially in a primitive condition of society. Hence the “spirits” were feared as demons rather than worshipped as powers of good, and instead of a priest a sorcerer was needed who knew the charms and incantations which could avert their malevolence or compel them to be serviceable to men. Sumerian religion, in fact, was Shamanistic, like that of some Siberian tribes to-day, and its ministers were Shamans or medicine-men skilled in witchcraft and sorcery whose spells were potent to parry the attacks of the demon and drive him from the body of his victim, or to call him down in vengeance on the person of their enemy. Shamanism, however, pure and simple, is incompatible with an advanced state of culture, and as time went on the Shamanistic faith of the Sumerians tended toward a rudimentary form of polytheism. Out of the multitude of spirits there were two or three who assumed a more commanding position than the rest. The spirit of the sky, the spirit of the water, and more especially the spirit of the underground world, where the ghosts of the dead and the demons of night congregated together, took precedence of the rest. Already, before contact with the Semites, they began to assume the attributes of gods. Temples were raised in their honor, and where there were temples there were also priests. This transition of certain spirits into gods seems to have been aided by that study of the heavens and of the heavenly bodies for which the Babylonians were immemorially famous. At all events, the ideograph which denotes “a god” is an eight-rayed star, from which we may perhaps infer that, at the time of the invention of the picture-writing out of which the cuneiform characters grew, the gods and the stars were identical. One of the oldest of the Sumerian temples was that of Nippur, the modern Niffer, built in honor of Mul-lil or El-lil, “the lord of the ghost-world.” He had originally been the spirit of the earth and the underground world; when he became a god his old attributes still clung to him. To the last he was the ruler of the _lil-mes_, “the ghosts” and “demons” who dwelt in the air and the waste places of the earth, as well as in the abode of death and darkness that lay beneath it. His priests preserved their old Shamanistic character; the ritual they celebrated was one of spells and incantations, of magical rites and ceremonies. Nippur was the source and centre of one of the two great streams of religious thought and culture which influenced Sumerian Babylonia.