Although in the Vedic hymns the features of the primitive nature-myth reappear again and again, Indra himself boasting, “I slew Vritra, O Maruts, with might, having grown strong with my own vigour; I who hold the thunderbolt in my arms, I have made these all-brilliant waters to flow freely for man,” we find an approach in them to some conception of that spiritual conflict of which the physical conflict was so complete a symbol. Indra as victor, is an object of adoration and invested with purity and goodness; Vritra, as the enemy of men, is an object of dread, and invested with malice and evil.

But while in the Zend-Avesta, the Scriptures of the old Iranian religion, the struggle between Thraetaôna and the three-headed serpent Azhi-Dahâka (in which names are recognisable the Traitana and Ahi of the Veda and the Feridun and Zohak of Persian epic) is narrated, the moral idea is dominant throughout. The theme is not the attack of the sun-god to recover stolen milch cows from the dragon’s cave, but the battle between Ormuzd, the Spirit of Light, and Ahriman, the Spirit of Darkness. The one seeks to mar the earth which the other has made. Into the fair paradise, Airayana-Vaêjô, “a delightful spot,” as the Avesta calls it, “with good waters and trees,” and into other smiling lands which Ormuzd has blessed, Ahriman sends “a mighty serpent ... strong, deadly frost ... buzzing insects, and poisonous plants ... toil and poverty,” and, worse than all, “the curse of unbelief.”[25] Between these two spiritual powers and their armies of good and bad angels the battle rages for supremacy in the universe, for possession of the citadel of Mansoul.

Early in the history of the Asiatic Aryan tribes there had arisen a quarrel between the Brahmanic and Iranian divisions. The latter had become a quiet-loving, agricultural people, while the former remained marauding nomads, attacking and harassing their neighbours. In their plundering inroads they invoked the aid of spells and sacrifices, offering the sacred soma-juice to their gods, and nerving themselves for the fray by deep draughts of the intoxicating stuff. Not only they, but their gods as well, thereby became objects of hatred to the peaceful Iranians, who foreswore all worship of freebooter’s deities, and transformed these devas of the old religion into demons. That religion, as common to the Indo-European race, was polytheistic, a worship of deities each ruling over some department of nature, but a worship exalting now one, now another god, be it Indra, or Varuna, or Agni, according to the indications of the deity’s supremacy, or according to the mood of the worshipper. As remarked by Jacob Grimm, “the idea of the devil is foreign to all primitive religions,” obviously because in all primitive thought evil and good are alike regarded as the work of deities. In the Old Testament, Yahweh is spoken of as the author of both;[26] the angels, whether charged with weal or woe, are his messengers. In the Iliad Zeus dispenses both:—

“Two urns by Jove’s high throne have ever stood,
The source of evil one, the other good;
From thence the cup of mortal man he fills,
Blessings to these, to those distribute ills,
To most, he mingles both,”[27]

and ’tis a far cry from this to the loftier conception of Euripides: “If the gods do evil, then are they no gods.” So there was a monotheistic—or, as Professor Max Müller terms it, a henotheistic—element in the Vedic religion which in the Iranian religion, and this mainly through the teaching of the great thinker and reformer Zarathushtra (Zoroaster), was largely diffused. In his endeavour to solve the old problem of reconciling sin and misery with omnipotent goodness, he supposes “two primeval causes,” one of which produced the “reality,” or good mind; the other the “non-reality,” or evil mind. Behind these was developed belief in a philosophical abstraction, “uncreate time,” of which each was the product; but such doctrines were too subtle for the popular grasp, and, wrapped in the old mythological garb, they appeared in concrete form as dualism. Vritra survived in Ahriman, who, like him, is represented as a serpent; and in Ormuzd we have the phonetic descendant of Ahura-mazda.

Now, it was with this dualism, this transformed survival of the sun and cloud myth, that the Jews came into association during their memorable exile in Babylon. Prior to that time their theology, as hinted above, had no devil in it. But in that belief in spirits which they held in common with all semi-civilised races, as a heritage from barbarous ancestors, there were the elements out of which such a personality might be readily evolved. Their satan, or “accuser,” as that word means, is no prince of the demons, like the Beelzebul of later times; no dragon or old serpent, as of the Apocalypse, defying Omnipotence and deceiving the whole world; but a kind of detective who, by direction of Yahweh, has his eye on suspects, and who is sent to test their fidelity. In all his missions he acts as the intelligent and loyal servant of Yahweh. But although therefore not regarded as bad himself, the character and functions with which he was credited made easy the transition from such theories about him to theories of him as inherently evil, as the enemy of goodness, and, therefore, of God. He who, like Vritra, was an object of dread, came to be regarded as the incarnation of evil, the author and abettor of things harmful to man. Persian dualism gave concrete form to this conception, and from the time of the Exile we find Satan as the Jewish Ahriman, the antagonist of God. Not he alone, for “the angels that kept not their first estate” were the ministers of his evil designs, creatures so numerous that every one has 10,000 at his right hand and 1000 at his left hand, and because they rule chiefly at night no man should greet another lest he salute a demon. They haunt lonely spots, often assume the shape of beasts, and it is their presence in the bodies of men and women which is the cause of madness and other diseases.[28]

From the period when the Apocryphal books, especially those having traces of Persian influence, were written,[29] this doctrine of an arch-fiend with his army of demons received increasing impetus. It passed on without check into the Christian religion, and wherever this spread the heathen gods, like the devas of Brahmanism among the Iranians, were degraded into demons, and swelled the vast crowd of evil spirits let loose to torment and ruin mankind.

This doctrine of demonology, it should be remembered, was but the elaborated form of ancestral belief in spirits referred to above. In the Christian system it was associated with that belief in magic which has its roots in fetishism, and from the two arose belief in witchcraft. The universal belief in demons in early and mediæval times supplied an easy explanation of disasters and diseases; the sorcerers and charm-workers, the wizards and enchanters, had passed into the service of the devil. For power to work their spite and malevolence they had bartered their souls to him, and sealed the bargain with their blood. It was enough for the ignorant and frightened sufferers to accuse some poor, misshapen, squinting old woman of casting on them the evil eye, or of appearing in the form of a cat, to secure her trial by torture and her condemnation to an unpitied death. The spread of popular terror led to the issue of Papal bulls and to the passing of statutes in England and in other countries against witchcraft, and it was not until late in the eighteenth century that the laws against that imaginary crime were repealed.

There is no sadder chapter in the annals of this tearful world than this ghastly story of witch-finding and witch-burning. Sprenger computes that during the Christian epoch no less than nine millions of persons, mostly women of the poorer classes, were burned; victims of the survival into relatively civilised times of an illusion which had its source in primitive thought. It was an illusion which had the authority of Scripture on its side;[30] the Church had no hesitation concerning it; such men as Luther, Sir Thomas Browne, and Wesley never doubted it; the evidence of the bewitched was supported by honest witnesses; and judges disposed to mercy and humanity had no qualms in passing the dread sentence of the law on the condemned.[31]

And although it exists not to-day, save in by-places where gross darkness lurks, it was not destroyed by argument, by disproof, by direct assault, but only through the quiet growth and diffusion of the scientific spirit, before which it has dispersed. It could not live in an atmosphere thus purified, an atmosphere charged with belief in unchanging causation and in a definite order unbroken by caprice or fitfulness, whether in the sweep of a planet or the pulsations of a human heart.