At the age of 30, Zoroaster received a revelation: while fetching water at dawn for a sacred ritual, he saw the shining figure of the yazata, Vohu Manah, who led Zoroaster to the presence of Ahura Mazda, where he was taught the cardinal principles of the "Good Religion" later known as Zoroastrianism. As a result of this vision, Zoroaster felt that he was chosen to spread and preach the religion. He stated that this source of all goodness was the only Ahura worthy of the highest worship. He further stated that Ahura Mazda created spirits known as yazatas to aid him, who also merited devotion. Zoroaster proclaimed that all of the Iranian daevas were bad spirits and deserved no worship. These "bad" spirits were created by Angra Mainyu, the hostile and evil spirit. The existence of Angra Mainyu was the source of all sin and misery in the universe. Zoroaster claimed that Ahura Mazda was not an omnipotent God, but used the aid of humans in the cosmic struggle against Angra Mainyu. Nonetheless, Ahura Mazda is Angra Mainyu's superior, not his equal. Angra Mainyu and his daevas (destroyers), which attempt to attract humans away from the path of truth and righteousness (asha), would eventually be destroyed.