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Dualism (from the Latin word duo meaning "two") denotes the state of two parts. The term dualism was originally coined to denote co-eternal[clarification needed]binary opposition, a meaning that is preserved in metaphysical and philosophical duality discourse but has been more generalized in other usages to indicate a system which contains two essential parts.
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, ditheism or bi-theism implies (at least) two gods. While bi-theism 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 would be one in which one god is a creator, and the other a destroyer.
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.
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Moral dualism is the belief of the great complement or conflict between the benevolent and the malevolent. Like ditheism/bitheism (see below), moral dualism does not imply the absence of monist or monotheistic principles. Moral dualism simply implies that there are two moral opposites at work, independent of any interpretation of what might be "moral" and - unlike ditheism/bitheism - independent of how these may be represented.
For example, Mazdaism (Mazdean Zoroastrianism) is both dualistic and monotheistic (but not monist by definition) since in that philosophy God--the Creator--is purely good, and the antithesis--which is also uncreated-is an absolute one. Zurvanism (Zurvanite Zoroastrianism), Manichaeism, and Mandaeism are representative of dualistic and monist philosophies since each has a supreme and transcendental First Principle from which the two equal-but-opposite entities then emanate. This is also true for the lesser-known Christian gnostic religions, such as Bogomils, Catharism, and so on. More complex forms of monist dualism also exist, for instance in Hermeticism, where Nous "thought" - that is described to have created man - brings forth both good and evil, dependent on interpretation, whether it receives prompting from the God or from the Demon. Duality with pluralism is considered a logical fallacy.
Moral dualism began as a theological belief. Dualism was first seen implicitly in Egyptian religious beliefs by the contrast of the gods Set (disorder, death) and Osiris (order, life). The first explicit conception of dualism came from the Ancient Persian religion of Zoroastrianism around the mid-fifth century BC. Zoroastrianism is a monotheistic religion that believes that Ahura Mazda is the eternal creator of all good things. Any violations of Ahura Mazda's order arise from druj, which is everything uncreated. From this comes a significant choice for humans to make. Either they fully participate in human life for Ahura Mazda or they do not and give druj power. Personal dualism is even more distinct in the beliefs of later religions.
The religious dualism of Christianity between good and evil is not a perfect dualism as God (good) will inevitably destroy Satan (evil). Early Christian dualism is largely based on Platonic Dualism (See: Neoplatonism and Christianity). There is also a personal dualism in Christianity with a soul-body distinction based on the idea of an immaterial Christian soul.
In theology, dualism may refer to duotheism, bitheism, or ditheism. Although ditheism/bitheism imply moral dualism, they are not equivalent: ditheism/bitheism implies (at least) two gods, while moral dualism does not necessarily imply theism (theos = god) at all.
Both bitheism and ditheism imply a belief in two equally powerful gods with complementary or antonymous properties; however, while bitheism implies harmony, ditheism implies rivalry and opposition, such as between good and evil, bright and dark, or summer and winter. For example, a ditheistic system would be one in which one god is creative, the other is destructive (cf. theodicy). In the original conception of Zoroastrianism, for example, Ahura Mazda was the spirit of ultimate good, while Ahriman (Angra Mainyu) was the spirit of ultimate evil.
In a bitheistic system, by contrast, where the two deities are not in conflict or opposition, one could be male and the other female (cf. duotheism[clarification needed]). One well-known example of a bitheistic or duotheistic theology based on gender polarity is found in the neopagan religion of Wicca. In Wicca, dualism is represented in the belief of a god and a goddess as a dual partnership in ruling the universe. This is centered on the worship of a divine couple, the Moon Goddess and the Horned God, who are regarded as lovers. However, there is also a ditheistic theme within traditional Wicca, as the Horned God has dual aspects of bright and dark - relating to day/night, summer/winter - expressed as the Oak King and the Holly King, who in Wiccan myth and ritual are said to engage in battle twice a year for the hand of the Goddess, resulting in the changing seasons. (Within Wicca, bright and dark do not correspond to notions of "good" and "evil" but are aspects of the natural world, much like yin and yang in Taoism.)
However, bitheistic and ditheistic principles are not always so easily contrastable, for instance in a system where one god is the representative of summer and drought and the other of winter and rain/fertility (cf. the mythology of Persephone). Marcionism, an early Christian sect, held that the Old and New Testaments were the work of two opposing gods: both were First Principles, but of different religions.
In theology, dualism can refer to the relationship between God and creation or God and the universe. This form of dualism is a belief shared in certain traditions of Christianity and Hinduism.
The dualism between God and Creation has existed as a central belief in multiple historical sects and traditions of Christianity, including Marcionism, Catharism, Paulicianism, and Gnostic Christianity. Christian dualism refers to the belief that God and creation are distinct, but interrelated through an indivisible bond. In sects like the Cathars and the Paulicians, this is a dualism between the material world, created by an evil god, and a moral god. Historians divide Christian dualism into absolute dualism, which held that the good and evil gods were equally powerful, and mitigated dualism, which held that material evil was subordinate to the spiritual good. The belief, by Christian theologians who adhere to a libertarian or compatibilist view of free will, that free will separates humankind from God has also been characterized as a form of dualism. The theologian Leroy Stephens Rouner compares the dualism of Christianity with the dualism that exists in Zoroastrianism and the Samkhya tradition of Hinduism. The theological use of the word dualism dates back to 1700, in a book that describes the dualism between good and evil.
The tolerance of dualism ranges widely among the different Christian traditions. As a monotheistic religion, the conflict between dualism and monism has existed in Christianity since its inception. The 1912 Catholic Encyclopedia describes that, in the Catholic Church, "the dualistic hypothesis of an eternal world existing side by side with God was of course rejected" by the thirteenth century, but mind-body dualism was not. The problem of evil is difficult to reconcile with absolute monism, and has prompted some Christian sects to veer towards dualism. Gnostic forms of Christianity were more dualistic, and some Gnostic traditions posited that the Devil was separate from God as an independent deity. The Christian dualists of the Byzantine Empire, the Paulicians, were seen as Manichean heretics by Byzantine theologians. This tradition of Christian dualism, founded by Constantine-Silvanus, argued that the universe was created through evil and separate from a moral God.
The Cathars, a Christian sect in southern France, believed that there was a dualism between two gods, one representing good and the other representing evil. The Roman Catholic Church denounced the Cathars as heretics, and sought to crush the movement in the 13th century. The Albigensian Crusade was initiated by Pope Innocent III in 1208 to remove the Cathars from Languedoc in France, where they were known as Albigesians. The Inquisition, which began in 1233 under Pope Gregory IX, also targeted the Cathars.
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.
Alternatively, dualism can mean the tendency of humans to perceive and understand the world as being divided into two overarching categories. In this sense, it is dualistic when one perceives a tree as a thing separate from everything surrounding it. This form of ontological dualism exists in Taoism and Confucianism, beliefs that divide the universe into the complementary oppositions of yin and yang. In traditions such as classical Hinduism, Zen Buddhism or Islamic Sufism, a key to enlightenment is "transcending" this sort of dualistic thinking, without merely substituting dualism with monism or pluralism.
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, although the concept developed much earlier. Some argue that yin and yang were originally an earth and sky god, respectively. As one of the oldest principles in Chinese philosophy, yin and yang are also discussed in Confucianism, but to a lesser extent.
Some of the common associations with yang and yin, respectively, are: male and female, light and dark, active and passive, motion and stillness. Some scholars recognize that the two ideas may have originally referred to two opposite sides of a mountain, facing towards and away from the sun. The yin and yang symbol in actuality has very little to do with Western dualism; instead it represents the philosophy of balance, where two opposites co-exist in harmony and are able to transmute into each other. In the yin-yang symbol there is a dot of yin in yang and a dot of yang in yin. In Taoism, this symbolizes the inter-connectedness of the opposite forces as different aspects of Tao, the First Principle. Contrast is needed to create a distinguishable reality, without which we would experience nothingness. Therefore, the independent principles of yin and yang are actually dependent on one another for each other's distinguishable existence.
The complementary dualistic concept seen in yin and yang represent the reciprocal interaction throughout nature, related to a feedback loop, where opposing forces do not exchange in opposition but instead exchange reciprocally to promote stabilization similar to homeostasis. An underlying principle in Taoism states that within every independent entity lies a part of its opposite. Within sickness lies health and vice versa. This is because all opposites are manifestations of the single Tao, and are therefore not independent from one another, but rather a variation of the same unifying force throughout all of nature.