Original: 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.
Simplified: 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.