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.
David Loy
In addition to many scholarly papers and popular articles, Loy is the author of several books on comparative philosophy and social ethics, including:"Nonduality" focuses on the nonduality of subject and object in Buddhism, Vedanta, and Taoism, with reference to several Western thinkers including Wittgenstein and Heidegger. The main argument is that these three Asian systems may be different attempts to describe the same (or very similar) experience. The categories of Buddhism (no self, impermanence, causality, eightfold path) and Advaita Vedanta (all-Self, time and causality as maya, no path) are "mirror images" of each other. Ultimately it becomes difficult to distinguish a formless Being (Brahman) from a formless nonbeing (shunyata). Buddhism can be understood as a more phenomenological description of nonduality, while Vedanta is a more metaphysical account.