All the bad things are represented as Angra Mainyu , the `` Destructive Principle '' . All the good things are represented by Ahura Mazda 's Spenta Mainyu , the instrument or `` Bounteous Principle '' of the act of creation . In Zoroastrian tradition , the malevolent is represented by Angra Mainyu ( also referred to as `` Ahriman '' ) , the `` Destructive Principle '' , while the benevolent is represented through Ahura Mazda 's Spenta Mainyu , the instrument or `` Bounteous Principle '' of the act of creation .