Monism is the metaphysical and theological view that all is of one essential essence, principle, substance or energy.
Monism is to be distinguished from dualism, which holds that ultimately there are two kinds of substance, and from pluralism, which holds that ultimately there are many kinds of substance.
Monism is often seen in relation to pantheism, panentheism, and an immanent God. The concepts of absolutism, the monad, and the "Universal substrate" are closely related as well.
Many forms of Hinduism (including Vedanta and Yoga), Taoism, Pantheism, Rastafari and similar systems of thought explore the mystical and spiritual elements of a monistic philosophy. With increasing awareness of these systems of thought, western spiritual and philosophical climate has seen a growing understanding of monism. Moreover, the New Thought Movement has embraced many monistic concepts for over 100 years.
Monism is often seen as partitioned into three basic types:
Monism is further defined according to three kinds:
Certain other positions are hard to pigeonhole into the above categories, including:
Although, like Spinoza, some pantheists may also be monists, and monism may even be essential to some versions of pantheism (like Spinoza's), not all pantheists are monists. Some are polytheists and some are pluralists; they believe, that there are many things and kinds of things and many different kinds of value. (Stanford Encyclopedia of Philosophy). Not all Monists are Pantheists. Exclusive Monists believe that the universe, the God of the Pantheist, simply does not exist. In addition, monists can be Deists, Theists or panentheists; believing in a monotheistic God that is omnipotent and all-pervading, and both transcendent and immanent. There are monist deists and panentheists in Hinduism (particularly in Advaita and Vishistadvaita respectively), Judaism (especially in Kabbalah), and in Christianity (especially among Oriental Orthodox, Eastern Orthodox, and Anglicans).
Another type of monism, qualified monism, from the school of Ramanuja or Vishishtadvaita, admits that the universe is part of God, or Narayana, a type of either pantheism or panentheism, but sees a plurality of souls and substances within this supreme Being. This type of monism, monistic theism, which includes the concept of a personal God as a universal, omnipotent Supreme Being who is both Immanent and Transcendent, is prevalent in Hinduism. (Monistic theism is not to be confused with absolute monotheism where God is viewed as transcendent only. In absolute monotheism, the notion of Immanence divinity (essence of God) present in all things is absent.)
Some Christians inveigh against the 'dangers of monism', asserting that in order to resolve all things to a single substrate, one dissolves God in the process. Much Christian thought has insisted that while the universe is dependent on God for its existence, it is also of a separate substance from God. Some contend that this means that monism is false, while others argue that there is a distinction between Ultimate Essence, and the differentiated essences (substances), so that the "single substrate" essentially is God. Theological arguments can be made for this within Christianity, for example employing the Christian doctrine of "divine simplicity" (though a monistic interpretation of that doctrine would not be considered orthodox by the Roman Catholic Church).
Valentinianism is commonly viewed as being a Gnostic heresy, most prevalent in the first centuries. While Gnostic traditions are typically regarded as dualistic, "a standard element in the interpretation of Valentinianism and similar forms of Gnosticism is the recognition that they are fundamentally monistic" (Schoedel, William, "Gnostic Monism and the Gospel of Truth" in Bentley Layton (ed.) The Rediscovery of Gnosticism, Vol.1: The School of Valentinus, E.J. Brill, Leiden.).
Valentinian sources regularly proclaim God (which is more akin to an indescribable Neoplatonist monad than the typical Orthodox Christian conception of a transcendent entity nevertheless possessed of a recognisable persona) to be fundamental to all things, and that our perception of a material universe is simply a misperception of this same fundamental, "superior" one-ness. Inasmuch as materiality is occasionally described by the Valentinians as being exterior to the monad, this description is intended in an epistemological sense, as depicting a state of being that is ignorant of the true nature of the universe. The depiction of differing states of knowledge or awareness in spatial terms is typical of Gnostic metaphor, especially within the Valentinian tradition.
Note that, at the same time, Jewish Thought considers God as separate from all physical, created things (transcendent) and as existing outside of time (eternal). For a discussion of the resultant paradox; see Tzimtzum.
Several modern religious movements and texts, for example the organizations within the New Thought Movement, the Unity Church and the book, A Course in Miracles, may be said to have a particularly mentalistic monism orientation. The theology of Christian Science is explicitly mentalistic monism: it teaches that all that exists is God and God's ideas; that the world as it appears to the senses is a distortion of the underlying spiritual reality. In A Course in Miracles the body and the senses are said to do nothing. All of our perceptions including the body and the sense organs are projected thought within the mind which only appear to function. One analogy is the movie screen. There is an appearance of characters sensing and reacting to one another when this is simply a projection.
The West is inundated with physicalistic monism. There is widespread belief that everything will be explained in terms of matter/energy by science. Since we are constantly taught this it may make the idea of mentalistic monism hard to grasp. One way to begin to grasp the idea is through analogy. The movie screen analogy was given above. If we next consider "Star Trek's holodeck" it takes us a step further as what appear to be physical objects are not. Next consider the movie "The Matrix". In "The Matrix" even people's bodies and identities are projected. Then replace the machine with a vast and powerful mind. A last analogy is our dreams at night. We seem to be in a world filled with other objects and other people and yet there is nothing physical. Projection makes perception. Although this is not a strict philosophical argument it does allow us to begin to think along these lines.
Historically, monism has been promoted in spiritual terms on several occasions, notably by Ernst Haeckel. To the dismay of some modern observers, Haeckel's various ideas often had components of social darwinism and scientific racism.
Paul Carus called himself "an atheist who loves God", and advocated "henism", which is often seen as monist or pantheist in nature.
Neoplatonism is Monistic. Plotinus taught that there was an ineffable transcendent God, 'The One,' of which subsequent realities were emanations. From The One emanates the Divine Mind (Nous), the Cosmic Soul (Psyche), and the World (Cosmos).
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