"Vision of Zoroaster
According to Zoroastrian belief, when Zoroaster was 30 years old, he went into the
Daiti river to draw water for a
Haoma ceremony; when he emerged, he received a vision of
Vohu Manah. After this, Vohu Manah took him to the other six Amesha Spentas, where he received the completion of his vision.
[72] This vision radically transformed his view of the world, and he tried to teach this view to others. Zoroaster believed in one creator God, teaching that only one God was worthy of worship. Some of the deities of the old religion, the
Daevas (
Devas in Sanskrit), appeared to delight in war and strife. Zoroaster said these were evil spirits, workers of Angra Mainyu.
Zoroaster's ideas were not taken up quickly; he originally only had one convert: his cousin Maidhyoimanha.
[73] The local religious authorities opposed his ideas, considering that their faith, power, and particularly their rituals, were threatened by Zoroaster's teaching against over-ritualising religious ceremonies. Many did not like Zoroaster's downgrading of the Daevas to evil spirits. After 12 years of little success, Zoroaster left his home.
In the country of King
Vishtaspa in
Bactria, the king and queen heard Zoroaster debating with the religious leaders of the land and decided to accept Zoroaster's ideas as the official religion of their kingdom. Zoroaster died in his late 70s. Very little is known of the time between Zoroaster and the
Achaemenian period, except that Zoroastrianism spread to Western Iran. By the time of the founding of the Achaemenid Empire, Zoroastrianism was already a well-established religion."
https://en.wikipedia.org/wiki/Thus_Spoke_Zarathustra
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