Zarathustra’s theology is not dualistic in the strict sense of the term, since Ahura Mazdā is not confronted by an anti-god; in the beginning, the opposition breaks out between the two Spirits. On the other hand, the unity between Ahura Mazdā and the Holy Spirit is several times implied (see Yasna 43. 3, etc.). In short, Good and Evil, the holy one and the destroying demon, proceed from Ahura Mazdā; but since Angra Mainyu freely chose his mode of being and his maleficent vocation, the Wise Lord cannot be considered responsible for the appearance of Evil. On the other hand, Ahura Mazdā, in his
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