This document discusses good and evil in mythology through various examples of sibling rivalry and antagonists. It describes how in myths like the Egyptian story of Osiris and Set, one brother is usually seen as good and the other as bad. Other myths explored include Cain and Abel from the Bible, and the Greek gods Zeus, Poseidon, and Hades casting lots. The document also examines trickster gods like Loki and Hermes, and how some villains like Loki become more purely evil over time, while others like Gilgamesh can become heroes. It notes how concepts of good and evil are more blurred in older polytheistic religions than in later monotheistic ones.