(43) According to the Persians, there coexisted in eternity two principles. The first of these, Ahura-Mazda, or Ormuzd, was the Spirit of Good. From Ormuzd came forth a number of hierarchies of good and beautiful spirits (angels and archangels). The second of these eternally existing principles was called Ahriman. He was also a pure and beautiful spirit, but he later rebelled against Ormuzd, being jealous of his power. This did not occur, however, until after Ormuzd had created light, for previously Ahriman had not been conscious of the existence of Ormuzd. Because of his jealousy and rebellion, Ahriman became the Spirit of Evil. From himself he individualized a host of destructive creatures to injure Ormuzd.

(44) When Ormuzd created the earth, Ahriman entered into its grosser elements. Whenever Ormuzd did a good deed, Ahriman placed the principle of evil within it. At last when Ormuzd created the human race, Ahriman became incarnate in the lower nature of man so that in each personality the Spirit of Good and the Spirit of Evil struggle for control. For 3,000 years Ormuzd ruled the celestial worlds with light and goodness. Then he created man. For another 3,000 years he ruled man with wisdom, and integrity. Then the power of Ahriman began, and the struggle for the soul of man continues through the next period of 3,000 years. During the fourth period of 3,000 years, the power of Ahriman will be destroyed. Good will return to the world again, evil and death will be vanquished, and at last the Spirit of Evil will bow humbly before the throne of Ormuzd. While Ormuzd and Ahriman are struggling for control of the human soul and for supremacy in Nature, Mithras, God of Intelligence, stands as mediator between the two. Many authors have noted the similarity between mercury and Mithras. As the chemical mercury acts as a solvent (according to alchemists), so Mithras seeks to harmonize the two celestial opposites.

(6) (And in partial answer to his question, and to solve his doubt, I now declare the truth): He who gives to this (good citizen) that which is better than the good ; yea, He who bestows on him in accordance with his religious choice is (our) Ahura Mazda (and not a false god of the Daêvas ). And this will He bestow through His divine Authority (established in preparation here), while on the withholder of the sacrifice, who offers nothing to His (cause), He will send worse than the evil (and that not here alone, but) in the last turning of the creation in its course!