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Monism attributes oneness or singleness (Greek: μόνος) to a concept e.g., existence. Various kinds of monism can be distinguished:
There are two sorts of definitions for monism:
Although the term monism is derived from Western philosophy to typify positions in the mind–body problem, it has also been used to typify religious traditions. In modern Hinduism, the term "absolute monism" is used for Advaita Vedanta.
The term monism was introduced in the 18th century by Christian von Wolff in his work Logic (1728), to designate types of philosophical thought in which the attempt was made to eliminate the dichotomy of body and mind and explain all phenomena by one unifying principle, or as manifestations of a single substance.
The mind–body problem in philosophy examines the relationship between mind and matter, and in particular the relationship between consciousness and the brain. The problem was addressed by René Descartes in the 17th century, resulting in Cartesian dualism, and by pre-Aristotelian philosophers, in Avicennian philosophy, and in earlier Asian and more specifically Indian traditions.
It was later also applied to the theory of absolute identity set forth by Hegel and Schelling. Thereafter the term was more broadly used, for any theory postulating a unifying principle. The opponent thesis of dualism also was broadened, to include pluralism. According to Urmson, as a result of this extended use, the term is "systematically ambiguous".
According to Jonathan Schaffer, monism lost popularity due to the emergence of analytic philosophy in the early twentieth century, which revolted against the neo-Hegelians. Rudolf Carnap and A. J. Ayer, who were strong proponents of positivism, "ridiculed the whole question as incoherent mysticism".
The mind–body problem has reemerged in social psychology and related fields, with the interest in mind–body interaction and the rejection of Cartesian mind–body dualism in the identity thesis, a modern form of monism. Monism is also still relevant to the philosophy of mind, where various positions are defended.
Views contrasting with monism are:
Monism in modern philosophy of mind can be divided into three broad categories:
Pantheism is the belief that everything composes an all-encompassing, immanent God, or that the universe (or nature) is identical with divinity. Pantheists thus do not believe in a personal or anthropomorphic god, but believe that interpretations of the term differ.
Pantheism was popularized in the modern era as both a theology and philosophy based on the work of the 17th-century philosopher Baruch Spinoza, whose Ethics was an answer to Descartes' famous dualist theory that the body and spirit are separate. Spinoza held that the two are the same, and this monism is a fundamental quality of his philosophy. He was described as a "God-intoxicated man," and used the word God to describe the unity of all substance. Although the term pantheism was not coined until after his death, Spinoza is regarded as its most celebrated advocate.
H. P. Owen claimed that
Pantheists are "monists" ... they believe that there is only one Being, and that all other forms of reality are either modes (or appearances) of it or identical with it.
Pantheism is closely related to monism, as pantheists too believe all of reality is one substance, called Universe, God or Nature. Panentheism, a slightly different concept (explained below), however is dualistic. Some of the most famous pantheists are the Stoics, Giordano Bruno and Spinoza.
Panentheism (from Greek πᾶν (pân) "all"; ἐν (en) "in"; and θεός (theós) "God"; "all-in-God") is a belief system that posits that the divine (be it a monotheistic God, polytheistic gods, or an eternal cosmic animating force) interpenetrates every part of nature, but is not one with nature. Panentheism differentiates itself from pantheism, which holds that the divine is synonymous with the universe.
In panentheism, there are two types of substance, "pan" the universe and God. The universe and the divine are not ontologically equivalent. God is viewed as the eternal animating force within the universe. In some forms of panentheism, the cosmos exists within God, who in turn "transcends", "pervades" or is "in" the cosmos.
While pantheism asserts that 'All is God', panentheism claims that God animates all of the universe, and also transcends the universe. In addition, some forms indicate that the universe is contained within God, like in the Judaic concept of Tzimtzum. Much Hindu thought is highly characterized by panentheism and pantheism.
Pandeism or pan-deism (from Ancient Greek: πᾶν, romanized: pan, lit. 'all' and Latin: deus meaning "god" in the sense of deism), is a term describing beliefs coherently incorporating or mixing logically reconcilable elements of pantheism (that "God", or a metaphysically equivalent creator deity, is identical to Nature) and classical deism (that the creator-god who designed the universe no longer exists in a status where it can be reached, and can instead be confirmed only by reason). It is therefore most particularly the belief that the creator of the universe actually became the universe, and so ceased to exist as a separate entity.
Through this synergy pandeism claims to answer primary objections to deism (why would God create and then not interact with the universe?) and to pantheism (how did the universe originate and what is its purpose?).
The central problem in Asian (religious) philosophy is not the body-mind problem, but the search for an unchanging Real or Absolute beyond the world of appearances and changing phenomena, and the search for liberation from dukkha and the liberation from the cycle of rebirth. In Hinduism, substance-ontology prevails, seeing Brahman as the unchanging real beyond the world of appearances. In Buddhism, process ontology is prevalent, seeing reality as empty of an unchanging essence.
Characteristic for various Asian religions is the discernment of levels of truth, an emphasis on intuitive-experiential understanding of the Absolute such as jnana, bodhi and kensho, and an emphasis on the integration of these levels of truth and its understanding.
Vedanta is the inquiry into and systematisation of the Vedas and Upanishads, to harmonise the various and contrasting ideas that can be found in those texts. Within Vedanta, different schools exist:
In Advaita Vedanta, Brahman is the eternal, unchanging, infinite, immanent, and transcendent reality which is the Divine Ground of all matter, energy, time, space, being, and everything beyond in this Universe. The nature of Brahman is described as transpersonal, personal and impersonal by different philosophical schools.
Advaita Vedanta gives an elaborate path to attain moksha. It entails more than self-inquiry or bare insight into one's real nature. Practice, especially Jnana Yoga, is needed to "destroy one's tendencies (vāasanā-s)" before real insight can be attained.
Advaita took over from the Madhyamika the idea of levels of reality. Usually two levels are being mentioned, but Shankara uses sublation as the criterion to postulate an ontological hierarchy of three levels:
All Vaishnava schools are panentheistic and view the universe as part of Krishna or Narayana, but see a plurality of souls and substances within Brahman. Monistic theism, which includes the concept of a personal god as a universal, omnipotent Supreme Being who is both immanent and transcendent, is prevalent within many other schools of Hinduism as well.
Tantra sees the Divine as both immanent and transcendent. The Divine can be found in the concrete world. Practices are aimed at transforming the passions, instead of transcending them.
The colonisation of India by the British had a major impact on Hindu society. In response, leading Hindu intellectuals started to study western culture and philosophy, integrating several western notions into Hinduism. This modernised Hinduism, at its turn, has gained popularity in the west.
A major role was played in the 19th century by Swami Vivekananda in the revival of Hinduism, and the spread of Advaita Vedanta to the west via the Ramakrishna Mission. His interpretation of Advaita Vedanta has been called Neo-Vedanta. In Advaita, Shankara suggests meditation and Nirvikalpa Samadhi are means to gain knowledge of the already existing unity of Brahman and Atman, not the highest goal itself:
[Y]oga is a meditative exercise of withdrawal from the particular and identification with the universal, leading to contemplation of oneself as the most universal, namely, Consciousness. This approach is different from the classical Yoga of complete thought suppression.
Vivekananda, according to Gavin Flood, was "a figure of great importance in the development of a modern Hindu self-understanding and in formulating the West's view of Hinduism." Central to his philosophy is the idea that the divine exists in all beings, that all human beings can achieve union with this "innate divinity", and that seeing this divine as the essence of others will further love and social harmony. According to Vivekananda, there is an essential unity to Hinduism, which underlies the diversity of its many forms. According to Flood, Vivekananda's view of Hinduism is the most common among Hindus today. This monism, according to Flood, is at the foundation of earlier Upanishads, to theosophy in the later Vedanta tradition and in modern Neo-Hinduism.
According to the Pāli Canon, both pluralism (nānatta) and monism (ekatta) are speculative views. A Theravada commentary notes that the former is similar to or associated with nihilism (ucchēdavāda), and the latter is similar to or associated with eternalism (sassatavada).
In the Madhyamaka school of Mahayana Buddhism, the ultimate nature of the world is described as Śūnyatā or "emptiness", which is inseparable from sensorial objects or anything else. That appears to be a monist position, but the Madhyamaka views – including variations like rangtong and shentong – will refrain from asserting any ultimately existent entity. They instead deconstruct any detailed or conceptual assertions about ultimate existence as resulting in absurd consequences. The Yogacara view, a minority school now only found among the Mahayana, also rejects monism.
The Prajnaparamita-sutras and Madhyamaka emphasize the non-duality of form and emptiness: "form is emptiness, emptiness is form", as the heart sutra says. In Chinese Buddhism this was understood to mean that ultimate reality is not a transcendental realm, but equal to the daily world of relative reality. This idea fitted into the Chinese culture, which emphasized the mundane world and society. But this does not tell how the absolute is present in the relative world:
To deny the duality of samsara and nirvana, as the Perfection of Wisdom does, or to demonstrate logically the error of dichotomizing conceptualization, as Nagarjuna does, is not to address the question of the relationship between samsara and nirvana -or, in more philosophical terms, between phenomenal and ultimate reality [...] What, then, is the relationship between these two realms?
Sikhism complies with the concept of Priority Monism. Sikh philosophy advocates that all that our senses comprehend is an illusion; God is the sole reality. Forms being subject to time shall pass away. God's Reality alone is eternal and abiding. The thought is that Atma (soul) is born from, and a reflection of, ParamAtma (Supreme Soul), and "will again merge into it", in the words of the fifth guru of Sikhs, Guru Arjan Dev Ji, "just as water merges back into the water."
ਜਿਉ ਜਲ ਮਹਿ ਜਲੁ ਆਇ ਖਟਾਨਾ ॥
Jio Jal Mehi Jal Aae Khattaanaa ||
As water comes to blend with water,
ਤਿਉ ਜੋਤੀ ਸੰਗਿ ਜੋਤਿ ਸਮਾਨਾ ॥
Thio Jothee Sang Joth Samaanaa ||
His light blends into the Light.— SGGS. Pg 278, https://www.searchgurbani.com/guru-granth-sahib/ang-by-ang
God and Soul are fundamentally the same; identical in the same way as Fire and its sparks. "Atam meh Ram, Ram meh Atam" which means "The Ultimate Eternal reality resides in the Soul and the Soul is contained in Him". As from one stream, millions of waves arise and yet the waves, made of water, again become water; in the same way all souls have sprung from the Universal Being and would blend again into it.
According to Maimonides, God is an incorporeal being that caused all other existence. According to Maimonides, to admit corporeality to God is tantamount to admitting complexity to God, which is a contradiction to God as the first cause and constitutes heresy. While Hasidic mystics considered the existence of the physical world a contradiction to God's simpleness, Maimonides saw no contradiction.[note 5]
According to Hasidic thought (particularly as propounded by the 18th century, early 19th-century founder of Chabad, Shneur Zalman of Liadi), God is held to be immanent within creation for two interrelated reasons:
The Vilna Gaon was very much against this philosophy, for he felt that it would lead to pantheism and heresy. According to some this is the main reason for the Gaon's ban on Chasidism.
Christianity strongly maintains the creator–creature distinction as fundamental. Christians maintain that God created the universe ex nihilo and not from his own substance, so that the creator is not to be confused with creation, but rather transcends it (metaphysical dualism) (cf. Genesis). Although, there is growing movement to have a "Christian Panentheism". Even more immanent concepts and theologies are to be defined together with God's omnipotence, omnipresence and omniscience, due to God's desire for intimate contact with his own creation (cf. Acts 17:27). Another use of the term "monism" is in Christian anthropology to refer to the innate nature of humankind as being holistic, as usually opposed to bipartite and tripartite views.
In On Free Choice of the Will, Augustine argued, in the context of the problem of evil, that evil is not the opposite of good, but rather merely the absence of good, something that does not have existence in itself. Likewise, C. S. Lewis described evil as a "parasite" in Mere Christianity, as he viewed evil as something that cannot exist without good to provide it with existence. Lewis went on to argue against dualism from the basis of moral absolutism, and rejected the dualistic notion that God and Satan are opposites, arguing instead that God has no equal, hence no opposite. Lewis rather viewed Satan as the opposite of Michael the archangel. Due to this, Lewis instead argued for a more limited type of dualism. Other theologians, such as Greg Boyd, have argued in more depth that the Biblical authors held a "limited dualism", meaning that God and Satan do engage in real battle, but only due to free will given by God, for the duration that God allows.
Isaiah 45:5–7 (KJV) says:
I am the LORD, and there is none else, there is no God beside me: I girded thee, though thou hast not known me: That they may know from the rising of the sun, and from the west, that there is none beside me. I am the LORD, and there is none else. I form the light, and create darkness: I make peace, and create evil: I the LORD do all these things.
In Roman Catholicism and Eastern Orthodoxy, while human beings are not ontologically identical with the Creator, they are nonetheless capable with uniting with his Divine Nature via theosis, and especially, through the devout reception of the Holy Eucharist. This is a supernatural union, over and above that natural union, of which St. John of the Cross says, "it must be known that God dwells and is present substantially in every soul, even in that of the greatest sinner in the world, and this union is natural." Julian of Norwich, while maintaining the orthodox duality of Creator and creature, nonetheless speaks of God as "the true Father and true Mother" of all natures; thus, he indwells them substantially and thus preserves them from annihilation, as without this sustaining indwelling everything would cease to exist.
However, in Eastern Orthodoxy, creation is united with God by grace and not by nature. This is called the Essence-Energies distinction; Orthodox Christians believe that the human person retains its individuality and is not swallowed up by the Monad while in union with God.
Some Christian theologians are avowed monists, such as Paul Tillich. Since God is he "in whom we live and move and have our being" (Book of Acts 17.28), it follows that everything that has being partakes in God.
Latter Day Saint theology also expresses a form of dual-aspect monism via materialism and eternalism, claiming that creation was ex materia (as opposed to ex nihilo in conventional Christianity), as expressed by Parley Pratt and echoed in view by the movement's founder Joseph Smith, making no distinction between the spiritual and the material, these being not just similarly eternal, but ultimately two manifestations of the same reality or substance.
"God, the father is material. Jesus Christ is material. Angels are material. Spirits are material. Men are material. The universe is material ... Nothing exists which is not material."— Parley Pratt
Parley Pratt implies a vitalism paired with evolutionary adaptation noting, “these eternal, self-existing elements possess in themselves certain inherent properties or attributes, in a greater or less degree; or, in other words, they possess intelligence, adapted to their several spheres.” 
Brigham Young anticipates a proto-mentality of elementary particles with his vitalist view, “there is life in all matter, throughout the vast extent of all the eternities; it is in the rock, the sand, the dust, in water, air, the gases, and in short, in every description and organization of matter; whether it be solid, liquid, or gaseous, particle operating with particle.” 
The LDS conception of matter is “essentially dynamic rather than static, if indeed it is not a kind of living energy, and that it is subject at least to the rule of intelligence.” 
John A. Widstoe held a similar, more vitalist view, that “Life is nothing more than matter in motion; that, therefore, all matter possess a kind of life… Matter… [is] intelligence… hence everything in the universe is alive.” However, Widstoe resisted outright affirming a belief in panpsychism. 
But most argue that Abrahamic religious scriptures, especially the Quran, see creation and God as two separate existences. It explains that everything has been created by God and is under his control, but at the same time distinguishes creation as being dependent on the existence of God.
In the shop for Unity (wahdat); anything that you see there except the One is an idol.
The most influential of the Islamic monists was the Sufi philosopher Ibn Arabi (1165–1240). He developed the concept of 'unity of being' (Arabic: waḥdat al-wujūd), which some argue is a monistic philosophy. Born in al-Andalus, he made an enormous impact on the Muslim world, where he was crowned "the great Master". In the centuries following his death, his ideas became increasingly controversial. Ahmad Sirhindi criticised monistic understanding of 'unity of being', advocating the dualistic-compatible 'unity of witness' (Arabic: wahdat ash-shuhud), maintaining separation of creator and creation. Later, Shah Waliullah Dehlawi reconciled the two ideas maintaining that their differences are semantic differences, arguing that the universal existence (which is different in creation to creator) and the divine essence are different and that the universal existence emanates (in a non-platonic sense) from the divine essence and that the relationship between them is similar to the relationship between the number four and a number being even.
Although the teachings of the Baháʼí Faith have a strong emphasis on social and ethical issues, there exist a number of foundational texts that have been described as mystical. Some of these include statements of a monist nature (e.g., The Seven Valleys and the Hidden Words). The differences between dualist and monist views are reconciled by the teaching that these opposing viewpoints are caused by differences in the observers themselves, not in that which is observed. This is not a 'higher truth/lower truth' position. God is unknowable. For man it is impossible to acquire any direct knowledge of God or the Absolute, because any knowledge that one has, is relative.
According to nondualism, many forms of religion are based on an experiential or intuitive understanding of "the Real". Nondualism, a modern reinterpretation of these religions, prefers the term "nondualism", instead of monism, because this understanding is "nonconceptual", "not graspable in an idea".[note 6][note 7]
To these nondual traditions belong Hinduism (including Vedanta, some forms of Yoga, and certain schools of Shaivism), Taoism, Pantheism, Rastafari, and similar systems of thought.