Monism, as a New Age belief, states that all that exists is derived from a single source of divine energy. Monism is the metaphysical and theological view that all is one, that there are no fundamental divisions, and that a unified set of laws underlie all of nature. The universe, at the deepest level of analysis, is then one thing or composed of one fundamental kind of stuff.
Monism is a philosophical worldview in which all of reality can be reduced to one “thing” or “substance.” This view is opposed to dualism (in which all of reality is reducible to two substances, e.g., good and evil; light and darkness; form and matter; body and soul) and pluralism (all of reality is comprised of multiple substances). In all of these philosophical views, this article uses the word substance in a technical sense to mean “essence,” or its “thing-ishness”; in other words, something in which properties adhere.
Idealistic Monism doctrine holds that the mind is all that exists, and that the only existing substance is mental, and that the external world is either mental itself or an illusion created by the mind. Thus there is only one reality. This one reality has been labeled by philosophers as the Supreme Being, or The One.