Dualistic cosmology
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, independent of any interpretation of what might be "moral" and independent of how these may be represented. Moral opposites might, for example, exist in a worldview which has one god, more than one god, or none. By contrast, duotheism, bitheism or ditheism implies (at least) two gods. While bitheism implies harmony, ditheism implies rivalry and opposition, such as between good and evil, or light and dark, or summer and winter. For example, a ditheistic system could be one in which one god is a creator, and the other a destroyer. In theology, dualism can also refer to the relationship between the deity and creation or the deity and the universe (see theistic dualism). This form of dualism is a belief shared in certain traditions of Christianity and Hinduism. Alternatively, in ontological dualism, the world is divided into two overarching categories. 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. It is also discussed in Confucianism.
Dualism (Indian philosophy)
The Dvaita Vedanta school of Indian philosophy espouses a dualism between God and the universe by theorizing the existence of two separate realities. The first and the more important reality is that of Shiva or Shakti or Vishnu or Brahman. Shiva or Shakti or Vishnu is the supreme Self, God, the absolute truth of the universe, the independent reality. The second reality is that of dependent but equally real universe that exists with its own separate essence. Everything that is composed of the second reality, such as individual soul (Jiva), matter, etc. exist with their own separate reality. The distinguishing factor of this philosophy as opposed to Advaita Vedanta (monistic conclusion of Vedas) is that God takes on a personal role and is seen as a real eternal entity that governs and controls the universe. Because the existence of individuals is grounded in the divine, they are depicted as reflections, images or even shadows of the divine, but never in any way identical with the divine. Salvation therefore is described as the realization that all finite reality is essentially dependent on the Supreme.