Dualism

In general, the belief that entities and concepts often appear in pairs. They are generally opposites. Often one is considered good and the other bad. Most conservative Christians believe that two, very powerful, supernatural powers influence the world: God and Satan. The religion of Zoroastrianism recognises one all-good deity and one who is all-evil.

Dualism is often used to refer to persons as being composed of body and soul, or to refer to the universe as being made up of mind and matter.