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.
Albert Camus
Camus presents the reader with dualisms such as happiness and sadness, dark and light, life and death, etc. He emphasizes the fact that happiness is fleeting and that the human condition is one of mortality; for Camus, this is cause for a greater appreciation for life and happiness. In "Le Mythe", dualism becomes a paradox: we value our own lives in spite of our mortality and in spite of the universe's silence. While we can live with a dualism ("I can accept periods of unhappiness, because I know I will also experience happiness to come"), we cannot live with the paradox ("I think my life is of great importance, but I also think it is meaningless"). In "Le Mythe", Camus investigates our experience of the Absurd and asks how we live with it. Our life must have meaning for us to value it. If we accept that life has no meaning and therefore no value, should we kill ourselves?