Work in this world;
in accord with the will of Ahura Mazda .
In ancient Persian mythology, Spenta Mainyu ("holy spirit") is the god of life and the personification of the good and the light. He is the twin brother of Angra Mainyu (Ahriman), the god of darkness, with whom he fights an eternal battle. In an earlier version of this religion, they both are the sons of Ahura Mazda (Ormazd). But later there is no longer a distinction between him and Ormazd, and they become one and the same god. His name, Spenta Mainyu, is after that no longer used. He still is the twin brother of Ahriman, but now their father is the primordial god Zurvan.
At the age of about forty, Zarathustra, a priest in the traditional Irani rites, received a revelation. In it, the many gods of the Iranis were supplanted by a new deity who was the supreme deity of the Good. This deity became known as Ahura Mazda, or the "Wise Lord.
to Ahura Mazda was Aingra Mainyu or Ahriman, the "Angry Spirit,"
the chief deity of evil. Both deities had underlings and partners. The
chief allies of Ahura Mazda were the "Amentas Spenta." Created
by the "Wise Lord," these "Bounteous" or "Holy
Immortals" included Mithra.
to Best thought, word, and deed,nspired through righteousness
Ahura- Mazda doth give unto us happiness, immortality (heaven), prosperity,
and perfect-mindedness through Spenta-Mainyu (Beneficent-spirit.) (Spentomad-Gatha-Ha-47.1
living beings, who(is) better in acts of worship, of such Ahura Mazda
(Himself) is aware. On account of their holiness -all such, both men and
Mithra is a much more fully developed image than the rather ethereal Mitra. It is Mithra wears the Phrygian cap, Persian trousers, and a cape. His hat is star speckled (from textual evidence his chariot is similarly decorated). Rays of light emerge from Mithra's head much like a halo. His choke collar is a serpent.
After Zoroaster died, his religion became corrupted by the Magi, or celibate priesthood who took over his religion and mediated between man and Ahura-Mazda. This priesthood introduced
many pre-Zoroastrian gods into the religion. Ahura-Mazda, the sun god Mithras, and the most important archangel, Spenta Mainyu (holy spirit). This formed a holy trinity. However, the Persians had no images of their gods and considered the use of them as a sign of folly.