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.