For Angra Mainyu, this interpretation meant a demotion from a spirit coeval with Ahura Mazda to a mere product of Ahura Mazda. Haug's theory was based to a great extent on a new interpretation of Yasna 30.3; he argued that the good "twin" in that passage should not be regarded as more or less identical to Ahura Mazda, as earlier Zoroastrian thought had assumed,
