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Zoroaster was the prophet of the Persians, the people who restored the Jews to Jerusalem, the same Persians who later gave rise to the Chaldeans. The basic idea in Zoroaster’s teaching is that there are two Gods, one good, the other evil. The good God is a God of Light, of Justice, of Wisdom, who created a perfectly good world. His name is Ahura Mazda, “First Father of the Righteous Order, who gave to the sun and stars their paths.” The Mazda bulbs were named after this God of Light. Against him stands a God of Evil, Angra Mainyu, “the Deceiver,” who is the god of lies, darkness, hypocrisy, violence, and malice. He it was who threw evil into this good and well-made world. Thus the world in which we live is a mixture of light and darkness, of good and evil. This worldview is the mythology of the Fall. In its biblical transformation, it is the Fall. There is then a nature world that is not good and one does not put oneself in accord with it. It is evil and one pulls out or away in order to correct it. From this view arises a mythology with this sequence: Creation, a Fall, followed by Zoroaster (or Zarathustra), who teaches the way of virtue that will bring a gradual restoration of goodness. On the last day, after a terrific battle known as Armageddon, or the Reckoning of Spirits, Zoroaster will appear, in a second incarnation, the evil power will be wiped out, and all will be peace, light, and virtue forever. This mythology is surely familiar to all.
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Joseph Campbell (Thou Art That: Transforming Religious Tradition (Collected Works of Joseph Campbell))