Moral dualism is the belief of the great complement of or conflict between the benevolent and the malevolent. It simply implies that there are two moral opposites at work, and unless we take care, the benevolent may take a back seat.
In ontological dualism, the world is divided into two, indicating to the tendency of humans to perceive and understand the world as being divided into two overarching categories, one comparatively more easy.
The opposition and combination of the universe's two basic principles of yin and yang is a large part of Chinese philosophy, and is an important feature of Taoism, both as a philosophy and as a religion (it is also discussed in Confucianism).
In theology, dualism may refer to duotheism, bitheism, or ditheism.
In the relationship between mind and matter, this claims that mind and matter are two separate categories. A position, which is popular with many of the world's religions.
Every human being is a higher self and a lower self--a self or mind of the spirit which has been growing for ages, and a self of the body, which is but a thing of yesterday. The higher self is full of prompting idea, suggestion and aspiration and seeks greater than what men and women now possess and enjoy. The lower or animal self regards these things as wild and visionary and makes us live and exist as men and women have lived and existed before us. The higher self argues possibilities and power for us greater than men and women now possess and enjoy. The lower self tends to find causes to rejoice unless stopped by others, which includes the higher self. The reason, the higher self chooses to intervene, is that the lower self is prone to getting into danger.