Philosophy of mind
Dualism is a set of views about the relationship between mind and matter (or body). It begins with the claim that mental phenomena are, in some respects, non-physical. One of the earliest known formulations of mind–body dualism was expressed in the eastern Sankhya and Yoga schools of Hindu philosophy (c. 650 BCE), which divided the world into purusha (mind/spirit) and prakriti (material substance). Specifically, the Yoga Sutra of Patanjali presents an analytical approach to the nature of the mind.
Kabbalah
Although Kabbalah propounds the Unity of God, one of the most serious and sustained criticisms is that it may lead away from monotheism, and instead promote dualism, the belief that there is a supernatural counterpart to God. The dualistic system holds that there is a good power versus an evil power. There are two primary models of Gnostic-dualistic cosmology: the first, which goes back to Zoroastrianism, believes creation is ontologically divided between good and evil forces; the second, found largely in Greco-Roman metaphysics like Neo-Platonism, argues that the universe knew a primordial harmony, but that a cosmic disruption yielded a second, evil dimension to reality. This second model influenced the cosmology of the Kabbalah.