The Bounteous Spirit.
In the Gathas the two twins who choose are Spenta Mainyu and Angra Mainyu, and Ahura Mazda is the father of neither choice — a distinction that keeps God out of the pairing. Later theology identified Spenta Mainyu with Ahura Mazda himself, which made the dualism cleaner and the Gathic text harder to read straight.
The precise identity of the twins in Yasna 30 is the single most consequential interpretive question in Zoroastrian studies. The text says two primal spirits, twins, made a choice between better and bad. On the reading that most modern scholars take, the twins are Spenta Mainyu, the Bounteous Spirit, and Angra Mainyu, the Hostile Spirit, and Ahura Mazda is the father of neither choice — he stands above the pairing, which preserves a strict monotheism with a subordinate cosmic conflict. On the later Sasanian systematisation, Spenta Mainyu is identified with Ahura Mazda himself, which makes the opposition a straightforward duel between God and the devil and yields the cosmic dualism the Greeks and later observers described. A third position, the Zurvanite heresy attested in Sasanian times, made both twins sons of Zurvan, Time — which orthodoxy rejected. Which reading one adopts determines whether one calls the religion monotheistic or dualist, and Zoroastrians today overwhelmingly say monotheistic.
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