Dualism, in religion and mythology, is the belief that reality is shaped by two fundamental and usually opposed principles, such as good and evil, light and darkness, or spirit and matter. It appears in Zoroastrianism, Gnosticism, Manichaeism and several medieval Christian movements, and it differs from philosophical mind-body dualism, which concerns the relation of mind and body.
Dualism at a glance
| Core idea | Two fundamental principles, often good and evil |
|---|---|
| Main forms | Cosmic, moral, ontological (spirit versus matter) |
| Early example | Zoroastrianism: Ahura Mazda and Angra Mainyu |
| Key movements | Gnosticism, Manichaeism, Paulicians, Bogomils, Cathars |
| Related but distinct | Philosophical mind-body dualism; yin and yang |
Defining religious dualism
Scholars of religion use "dualism" for a family of worldviews rather than a single doctrine. In cosmic dualism, the universe is the battlefield of two powers, one good and one evil, that may be equal or unequal in strength. In ontological dualism, spirit and matter are treated as two different kinds of reality, with matter often seen as a prison or a corruption. Moral dualism stresses the struggle between good and evil in human choices without necessarily positing two gods.
Some dualisms are absolute, holding that both principles are eternal and uncreated. Others are mitigated or relative, holding that the evil principle is a lesser, created or fallen being. This distinction became important in medieval debates, since orthodox Christianity rejected any claim that evil had its own eternal source.
Zoroastrian and Iranian roots
Ancient Iranian religion offers the classic example. Zoroastrian tradition sets Ahura Mazda, the Wise Lord, against Angra Mainyu, called Ahriman in later Persian, the hostile spirit. Human beings are asked to side with truth and order against the lie through good thoughts, good words and good deeds, and the struggle is expected to end with the final victory of good.
Scholars debate how early and how strict this dualism was, and whether it influenced Jewish, Christian and Greek thought during the Persian and Hellenistic periods. Many see Iranian ideas behind later developments such as the growing role of Satan as an adversary, although the question of direct borrowing remains contested. Other ancient traditions, including the Egyptian contrast between Osiris and Set, show looser forms of opposition.
Gnostic dualism
In the first centuries CE, Gnostic teachers developed an influential form of spirit-matter dualism. Many Gnostic systems describe a remote, perfect God and a lower creator, the demiurge, sometimes named Yaldabaoth, who made the material world out of ignorance or arrogance. Sparks of divine light are trapped in human bodies, and salvation comes through gnosis, a saving knowledge of one's true origin.
Groups such as the Ophites, who gave a positive role to the serpent of Eden, belonged to this broad current. For centuries Gnosticism was known mainly through its opponents, the Church Fathers, until the 1945 discovery of the Nag Hammadi library in Egypt made many original texts available. Modern scholars stress that "Gnosticism" covers diverse movements, and some question whether the label is useful at all.
Manichaeism and medieval dualist movements
The most systematic ancient dualism was Manichaeism, founded by the prophet Mani in third-century Mesopotamia. It taught that two eternal principles, Light and Darkness, had become mixed, and that the religious life served to free particles of light from matter. Manichaeism spread from the Roman Empire to China before fading away.
In the Byzantine world and medieval Europe, dualist ideas resurfaced among the Paulicians, the Bogomils of the Balkans and the Cathars of southern France and northern Italy. Their opponents often called them "Manichaeans," although historians debate how far there was any direct historical link. The Cathars were suppressed by the Albigensian Crusade and the Inquisition in the thirteenth and fourteenth centuries.
Other meanings and legacy
The word dualism is also used in philosophy for the view, associated especially with Rene Descartes, that mind and body are distinct substances. This philosophical dualism is related to, but not the same as, religious dualism about good and evil. In Hindu thought, Dvaita Vedanta, founded by Madhva, is called dualist because it distinguishes the individual soul from God. Chinese yin and yang describe complementary rather than hostile forces and are usually not classed as dualism in the Iranian sense.
Dualist imagery, the contest of light and darkness, has shaped Western ideas about the Devil, moral struggle and apocalypse, and it remains common in modern fantasy and popular culture. Related ancient ideas about the soul's imprisonment in the body appear in Orphism and Platonism.
Dualism, monotheism and the problem of evil
Dualist systems are often understood as answers to the problem of evil: if the world contains suffering and wickedness, where do they come from? A dualist answer places evil in a second principle or in matter itself, so that the good God is not responsible for it. Monotheistic traditions such as Judaism, Christianity and Islam generally reject this solution, insisting that one God created everything and that evil arises from the misuse of freedom or from rebellion by created beings.
Even so, these religions contain dualistic elements in their imagery of God and the Devil, angels and demons, and the children of light and darkness. Scholars sometimes describe such views as a moderate or eschatological dualism, in which evil is real and active but temporary and ultimately subordinate.
Related entries
Frequently asked questions
What is dualism in religion?
Religious dualism is the belief that the world is shaped by two basic principles, usually opposed, such as good and evil, light and darkness, or spirit and matter. Classic examples include Zoroastrianism, Gnosticism and Manichaeism. Some dualisms treat both principles as eternal, while others see evil as a lesser, created or fallen power.
Is Gnosticism dualistic?
Many Gnostic systems are dualistic. They contrast a hidden, perfect God with a flawed creator of the material world, often called the demiurge, and regard the body and matter as a trap for the divine spark. Scholars note that Gnostic groups varied widely, so the degree of dualism differs from text to text.
How is religious dualism different from mind-body dualism?
Religious or cosmic dualism concerns two powers or principles governing the universe, such as good and evil. Mind-body dualism, associated with Descartes, is a philosophical claim that the mind and the physical body are different kinds of substance. The two ideas can overlap, as in spirit-matter dualism, but they answer different questions.
Sources and further reading
This entry replaces an article from the original Mystica encyclopedia (online since 2001). It was rewritten from the sources above by The Mystica Editorial Team under our editorial standards. Last reviewed: September 30, 2026.