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Soul or psyche (Greek: "psychē", of "psychein", "to breathe") are the mental abilities of a living being: reason, character, feeling, consciousness, memory, perception, thinking, etc.
Depending on the philosophical system, a soul can either be mortal or immortal. In Judeo-Christianity, only human beings have immortal souls (although immortality is disputed within Judaism and may have been influenced by Plato). For example, the Catholic theologian Thomas Aquinas attributed "soul" (anima) to all organisms but argued that only human souls are immortal. Other religions (most notably Hinduism and Jainism) hold that all biological organisms have souls, as did Aristotle, while some teach that even non-biological entities (such as rivers and mountains) possess souls. The latter belief is called animism.
Greek philosophers, such as Socrates, Plato, and Aristotle, understood that the soul (ψυχή psūchê) must have a logical faculty, the exercise of which was the most divine of human actions. At his defense trial, Socrates even summarized his teaching as nothing other than an exhortation for his fellow Athenians to excel in matters of the psyche since all bodily goods are dependent on such excellence (Apology 30a–b).
Anima mundi is the concept of a "world soul" connecting all living organisms on planet Earth.
The Modern English word "soul", derived from Old English sáwol, sáwel, was first attested in the 8th-century poem Beowulf v. 2820 and in the Vespasian Psalter 77.50. It is cognate with other German and Baltic terms for the same idea, including Gothic saiwala, Old High German sêula, sêla, Old Saxon sêola, Old Low Franconian sêla, sîla, Old Norse sála and Lithuanian siela. Further etymology of the Germanic word is uncertain. The original concept is meant to be 'coming from or belonging to the sea/lake', because of the German belief in souls being born out of and returning to sacred lakes, Old Saxon sêola (soul) compared to Old Saxon sêo (sea).
The Koine Greek word ψυχή psychē, "life, spirit, consciousness", is derived from a verb meaning "to cool, to blow", and hence refers to the breath, as opposed to σῶμα ("soma"), meaning "body". Psychē occurs juxtaposed to σῶμα, as seen in Matthew 10:28:
φοβεῖσθε δὲ μᾶλλον τὸν δυνάμενον καὶ ψυχὴν καὶ σῶμα ἀπολέσαι ἐν γεέννῃ.
In the Septuagint (LXX), ψυχή translates Hebrew נפש nephesh, meaning "life, vital breath", and specifically refers to a mortal, physical life, but is in English variously translated as "soul, self, life, creature, person, appetite, mind, living being, desire, emotion, passion"; an example can be found in Genesis 1:20:
Paul of Tarsus used ψυχή and πνεῦμα specifically to distinguish between the Jewish notions of נפש nephesh and רוח ruah (spirit) (also in LXX, e.g. Genesis 1:2 וְר֣וּחַאֱלֹהִ֔ים = πνεῦμα θεοῦ = spiritus Dei = "the Spirit of God").
The ancient Greeks used the word "alive" for the concept of being "ensouled", indicating that the earliest surviving western philosophical view believed that the soul was that which gave the body life. The soul was considered the incorporeal or spiritual "breath" that animates (from the Latin, anima, cf. "animal") the living organism.
Francis M. Cornford quotes Pindar by saying that the soul sleeps while the limbs are active, but when one is sleeping, the soul is active and reveals "an award of joy or sorrow drawing near" in dreams.
Drawing on the words of his teacher Socrates, Plato considered the psyche to be the essence of a person, being that which decides how we behave. He considered this essence to be an incorporeal, eternal occupant of our being. Socrates says that even after death, the soul exists and is able to think. He believed that as bodies die, the soul is continually reborn in subsequent bodies and Plato believed this as well, however, he thought that only one part of the soul was immortal (logos). The Platonic soul consists of three parts:
The parts are located in different regions of the body:
Plato also compares the three parts of the soul or psyche to a societal caste system. According to Plato's theory, the three-part soul is essentially the same thing as a state's class system because, to function well, each part must contribute so that the whole functions well. Logos keeps the other functions of the soul regulated.
Aristotle (384 BC – 322 BC) defined the soul, or Psūchê (ψυχή), as the "first actuality" of a naturally organized body, and argued against its separate existence from the physical body. In Aristotle's view, the primary activity, or full actualization, of a living thing constitutes its soul. For example, the full actualization of an eye, as an independent organism, is to see (its purpose or final cause). Another example is that the full actualization of a human being would be living a fully functional human life in accordance with reason (which he considered to be a faculty unique to humanity). For Aristotle, the soul is the organization of the form and matter of a natural being which allows it to strive for its full actualization. This organization between form and matter is necessary for any activity, or functionality, to be possible in a natural being. Using an artifact (non-natural being) as an example, a house is a building for human habituation, but for a house to be actualized requires the material (wood, nails, bricks, etc.) necessary for its actuality (i.e. being a fully functional house). However, this does not imply that a house has a soul. In regards to artifacts, the source of motion that is required for their full actualization is outside of themselves (for example, a builder builds a house). In natural beings, this source of motion is contained within the being itself. Aristotle elaborates on this point when he addresses the faculties of the soul.
The various faculties of the soul, such as nutrition, movement (peculiar to animals), reason (peculiar to humans), sensation (special, common, and incidental) and so forth, when exercised, constitute the "second" actuality, or fulfillment, of the capacity to be alive. For example, someone who falls asleep, as opposed to someone who falls dead, can wake up and live their life, while the latter can no longer do so.
Aristotle identified three hierarchical levels of natural beings: plants, animals, and people. For these groups, he identified three corresponding levels of soul, or biological activity: the nutritive activity of growth, sustenance and reproduction which all life shares; the self-willed motive activity and sensory faculties, which only animals and people have in common; and finally "reason", of which people alone are capable.
Aristotle's discussion of the soul is in his work, De Anima (On the Soul). Although mostly seen as opposing Plato in regard to the immortality of the soul, a controversy can be found in relation to the fifth chapter of the third book. In this text both interpretations can be argued for, soul as a whole can be deemed mortal and a part called "active intellect" or "active mind" is immortal and eternal. Advocates exist for both sides of the controversy, but it has been understood that there will be permanent disagreement about its final conclusions, as no other Aristotelian text contains this specific point, and this part of De Anima is obscure.
Following Aristotle, Avicenna (Ibn Sina) and Ibn al-Nafis, a Persian philosopher, further elaborated upon the Aristotelian understanding of the soul and developed their own theories on the soul. They both made a distinction between the soul and the spirit, and the Avicennian doctrine on the nature of the soul was influential among the Scholastics. Some of Avicenna's views on the soul include the idea that the immortality of the soul is a consequence of its nature, and not a purpose for it to fulfill. In his theory of "The Ten Intellects", he viewed the human soul as the tenth and final intellect.
While he was imprisoned, Avicenna wrote his famous "Floating Man" thought experiment to demonstrate human self-awareness and the substantial nature of the soul. He told his readers to imagine themselves suspended in the air, isolated from all sensations, which includes no sensory contact with even their own bodies. He argues that in this scenario one would still have self-consciousness. He thus concludes that the idea of the self is not logically dependent on any physical thing, and that the soul should not be seen in relative terms, but as a primary given, a substance. This argument was later refined and simplified by René Descartes in epistemic terms, when he stated: "I can abstract from the supposition of all external things, but not from the supposition of my own consciousness."
Avicenna generally supported Aristotle's idea of the soul originating from the heart, whereas Ibn al-Nafis rejected this idea and instead argued that the soul "is related to the entirety and not to one or a few organs". He further criticized Aristotle's idea whereby every unique soul requires the existence of a unique source, in this case the heart. al-Nafis concluded that "the soul is related primarily neither to the spirit nor to any organ, but rather to the entire matter whose temperament is prepared to receive that soul," and he defined the soul as nothing other than "what a human indicates by saying "I".
Following Aristotle and Avicenna, Thomas Aquinas (1225–74) understood the soul to be the first actuality of the living body. Consequent to this, he distinguished three orders of life: plants, which feed and grow; animals, which add sensation to the operations of plants; and humans, which add intellect to the operations of animals.
Concerning the human soul, his epistemological theory required that, since the knower becomes what he knows, the soul is definitely not corporeal—if it is corporeal when it knows what some corporeal thing is, that thing would come to be within it. Therefore, the soul has an operation which does not rely on a body organ, and therefore the soul can exist without a body. Furthermore, since the rational soul of human beings is a subsistent form and not something made of matter and form, it cannot be destroyed in any natural process. The full argument for the immortality of the soul and Aquinas' elaboration of Aristotelian theory is found in Question 75 of the First Part of the Summa Theologica.
In his discussions of rational psychology, Immanuel Kant (1724–1804) identified the soul as the "I" in the strictest sense, and argued that the existence of inner experience can neither be proved nor disproved. "We cannot prove a priori the immateriality of the soul, but rather only so much: that all properties and actions of the soul cannot be recognized from materiality". It is from the "I", or soul, that Kant proposes transcendental rationalization, but cautions that such rationalization can only determine the limits of knowledge if it is to remain practical.
Gilbert Ryle's ghost-in-the-machine argument, which is a rejection of Descartes' mind-body dualism can provide a contemporary understanding of the soul/mind, and the problem concerning its connection to the brain/body.
Psychologist James Hillman's archetypal psychology is an attempt to restore the concept of the soul, which Hillman viewed as the "self-sustaining and imagining substrate" upon which consciousness rests. Hillman described the soul as that "which makes meaning possible, [deepens] events into experiences, is communicated in love, and has a religious concern", as well as "a special relation with death". Departing from the Cartesian dualism "between outer tangible reality and inner states of mind", Hillman takes the Neoplatonic stance that there is a "third, middle position" in which soul resides. Archetypal psychology acknowledges this third position by attuning to, and often accepting, the archetypes, dreams, myths, and even psychopathologies through which, in Hillman's view, soul expresses itself.
In the ancient Egyptian religion, an individual was believed to be made up of various elements, some physical and some spiritual.
Similar ideas are found in ancient Assyrian and Babylonian religion. Kuttamuwa, an 8th-century BC royal official from Sam'al, ordered an inscribed stele erected upon his death. The inscription requested that his mourners commemorate his life and his afterlife with feasts "for my soul that is in this stele". It is one of the earliest references to a soul as a separate entity from the body. The 800-pound (360 kg) basalt stele is 3 ft (0.91 m) tall and 2 ft (0.61 m) wide. It was uncovered in the third season of excavations by the Neubauer Expedition of the Oriental Institute in Chicago, Illinois.
The Bahá'í Faith affirms that "the soul is a sign of God, a heavenly gem whose reality the most learned of men hath failed to grasp, and whose mystery no mind, however acute, can ever hope to unravel". Bahá'u'lláh stated that the soul not only continues to live after the physical death of the human body, but is, in fact, immortal. Heaven can be seen partly as the soul's state of nearness to God; and hell as a state of remoteness from God. Each state follows as a natural consequence of individual efforts, or the lack thereof, to develop spiritually. Bahá'u'lláh taught that individuals have no existence prior to their life here on earth and the soul's evolution is always towards God and away from the material world.
Buddhism teaches that all things are in a constant state of flux: all is changing, and no permanent state exists by itself. This applies to human beings as much as to anything else in the cosmos. Thus, a human being has no permanent self. According to this doctrine of anatta (Pāli; Sanskrit: anātman) – "no-self" or "no soul" – the words "I" or "me" do not refer to any fixed thing. They are simply convenient terms that allow us to refer to an ever-changing entity.
The anatta doctrine is not a kind of materialism. Buddhism does not deny the existence of "immaterial" entities, and it (at least traditionally) distinguishes bodily states from mental states. Thus, the conventional translation of anatta as "no-soul" can be confusing. If the word "soul" simply refers to an incorporeal component in living things that can continue after death, then Buddhism does not deny the existence of the soul. Instead, Buddhism denies the existence of a permanent entity that remains constant behind the changing corporeal and incorporeal components of a living being. Just as the body changes from moment to moment, so thoughts come and go, and there is no permanent state underlying the mind that experiences these thoughts, as in Cartesianism. Conscious mental states simply arise and perish with no "thinker" behind them. When the body dies, Buddhists believe the incorporeal mental processes continue and are reborn in a new body. Because the mental processes are constantly changing, the being that is reborn is neither entirely different from, nor exactly the same as, the being that died. However, the new being is continuous with the being that died – in the same way that the "you" of this moment is continuous with the "you" of a moment before, despite the fact that you are constantly changing.
Buddhist teaching holds that a notion of a permanent, abiding self is a delusion that is one of the causes of human conflict on the emotional, social, and political levels. They add that an understanding of anatta provides an accurate description of the human condition, and that this understanding allows us to pacify our mundane desires.
Various schools of Buddhism have differing ideas about what continues after death. The Yogacara school in Mahayana Buddhism said there are Store consciousness which continue to exist after death. In some schools, particularly Tibetan Buddhism, the view is that there are three minds: very subtle mind, which does not disintegrate in death; subtle mind, which disintegrates in death and which is "dreaming mind" or "unconscious mind"; and gross mind, which does not exist when one is sleeping. Therefore, gross mind is less permanent than subtle mind, which does not exist in death. Very subtle mind, however, does continue, and when it "catches on", or coincides with phenomena, again, a new subtle mind emerges, with its own personality/assumptions/habits, and that entity experiences karma in the current continuum.
Plants were said to be non-sentient (無情), but Buddhist monks are required to not cut or burn trees, because some sentient beings rely on them. Some Mahayana monks said non-sentient beings such as plants and stones have buddha-nature.
Certain modern Buddhists, particularly in Western countries, reject—or at least take an agnostic stance toward—the concept of rebirth or reincarnation, which they view as incompatible with the concept of anatta. Stephen Batchelor discusses this issue in his book Buddhism Without Beliefs. Others point to research that has been conducted at the University of Virginia as proof that some people are reborn.
Most Christians understand the soul as an ontological reality distinct from, yet integrally connected with, the body. Its characteristics are described in moral, spiritual, and philosophical terms. Richard Swinburne, a Christian philosopher of religion at Oxford University, wrote that "it is a frequent criticism of substance dualism that dualists cannot say what souls are. Souls are immaterial subjects of mental properties. They have sensations and thoughts, desires and beliefs, and perform intentional actions. Souls are essential parts of human beings". According to a common Christian eschatology, when people die, their souls will be judged by God and determined to go to Heaven or to Hell. Though all branches of Christianity – Catholics, Eastern Orthodox, Oriental Orthodox, Evangelical, and mainline Protestants teach that Jesus Christ plays a decisive role in the Christian salvation process, the specifics of that role and the part played by individual persons or ecclesiastical rituals and relationships, is a matter of wide diversity in official church teaching, theological speculation and popular practice. Some Christians believe that if one has not repented of one's sins and has not trusted in Jesus Christ as Lord and Savior, he/she will go to Hell and suffer eternal damnation or eternal separation from God. Some hold a belief that babies (including the unborn) and those with cognitive or mental impairments who have died will be received into Heaven on the basis of God's grace through the sacrifice of Jesus. 
Other Christians understand the soul as the life, and believe that the dead are sleeping (Christian conditionalism). This belief is traditionally accompanied by the belief that the unrighteous soul will cease to exist instead of suffering eternally (annihilationism). Believers will inherit eternal life either in Heaven, or in a Kingdom of God on earth, and enjoy eternal fellowship with God.
There are also beliefs in universal salvation.
Augustine, one of western Christianity's most influential early Christian thinkers, described the soul as "a special substance, endowed with reason, adapted to rule the body". Some Christians espouse a trichotomic view of humans, which characterizes humans as consisting of a body (soma), soul (psyche), and spirit (pneuma). However, the majority of modern Bible scholars point out how spirit and soul are used interchangeably in many biblical passages, and so hold to dichotomy: the view that each of us is body and soul. Paul said that the "body wars against" the soul, "For the word of God is living and active and sharper than any two-edged sword, and piercing as far as the division of soul and spirit" (Heb 4:12 NASB), and that "I buffet my body", to keep it under control. Trichotomy was changed to dichotomy as tenet of Christian faith at the Council of Constantinople in 869 regarded as the 8th Ecumenical Council by Roman Catholics.
The 'origin of the soul' has provided a vexing question in Christianity. The major theories put forward include soul creationism, traducianism and pre-existence. According to creationism, each individual soul is created directly by God, either at the moment of conception or some later time. According to traducianism, the soul comes from the parents by natural generation. According to the preexistence theory, the soul exists before the moment of conception. There have been differing thoughts regarding whether human embryos have souls from conception, or there is a point between conception and birth where the fetus acquires a soul, consciousness, and/or personhood. Stances in this question might more or less influence judgements on the morality of abortion.
The present Catechism of the Catholic Church defines the soul as "the innermost aspect of humans, that which is of greatest value in them, that by which they are in God's image described as 'soul' signifies the spiritual principle in man". All souls living and dead will be judged by Jesus Christ when he comes back to earth. The Catholic Church teaches that the existence of each individual soul is dependent wholly upon God: "The doctrine of the faith affirms that the spiritual and immortal soul is created immediately by God."
Protestants generally believe in the soul's existence, but fall into two major camps about what this means in terms of an afterlife. Some, following Calvin, believe in the immortality of the soul and conscious existence after death, while others, following Luther, believe in the mortality of the soul and unconscious "sleep" until the resurrection of the dead. Various new religious movements derived from Adventism—including Christadelphians, Seventh-day Adventists and Jehovah's Witnesses—similarly believe that the dead do not possess a soul separate from the body and are unconscious until the resurrection.
The Church of Jesus Christ of Latter-day Saints teaches that the spirit and body together constitute the Soul of Man (Mankind). "The spirit and the body are the soul of man." Latter-day Saints believe that the soul is the union of a pre-existing, God-made spirit and a temporal body, which is formed by physical conception on earth. After death, the spirit continues to live and progress in the Spirit world until the resurrection, when it is reunited with the body that once housed it. This reuniting of body and spirit results in a perfect soul that is immortal and eternal and capable of receiving a fulness of joy. Latter-day Saint cosmology also describes "intelligences" as the essence of consciousness or agency. These are co-eternal with God, and animate the spirits. The union of a newly created spirit body with an eternally-existing intelligence constitutes a "spirit birth" and justifies God's title "Father of our spirits".
In Hinduism, the Sanskrit words most closely corresponding to soul are jiva, Ātman and "purusha", meaning the individual self. The term "soul" is misleading as it implies an object possessed, whereas Self signifies the subject which perceives all objects. This Self (Ātman) is held to be distinct from the various mental faculties such as desires, thinking, understanding, reasoning and self-image (ego), all of which are considered to be part of prakriti (nature).
The three major schools of Hindu philosophy agree that the jiva (individual self) is related to Brahman (Self/God) but they differ in their explanations of the nature of this relationship. In Advaita Vedanta, the individual self and the Self are deemed to be one and the same. Dvaita rejects this concept of identity and instead identifies the self (jiva) as a separate but similar part of Self, that only becomes one with the Absolute Atman upon Self Realisation (Moksha). Visishtadvaita explains that the nature of the self (jiva) and Brahman (God) is that the jiva is God with attributes; this essentially means that the jiva is both different and the same as God concurrently. Visishtadvaita (Attributive Monism) is thus similar to Achintya Bhedābeda Tattva (Inconceivable Difference-Non difference Reality). For an atheistic and dualistic view of the jiva and Ātman in ancient Hindu philosophy, see Samkhya one of the six schools of Indian Philosophy.
The jiva becomes involved in the process of becoming and transmigrating through cycles of birth and death because of ignorance of its own true nature. The spiritual path consists of self-realization – a process in which one acquires the knowledge of the self (brahma-jñanam) and through this knowledge applied through meditation and realization one then returns to the Source which is Brahman.
The qualities which are common to both Brahman and atmam are being (sat), consciousness (chit), and bliss/love (ananda). Liberation or moksha is liberation from all limiting adjuncts (upadhis) and the unification with Brahman.
The Mandukya Upanishad verse 7 describes the atman in the following way:
"Not inwardly cognitive, not outwardly cognitive, not both-wise cognitive, not a cognition-mass, not cognitive, not non-cognitive, unseen, with which there can be no dealing, ungraspable, having no distinctive mark, non-thinkable, that cannot be designated, the essence of the assurance of which is the state of being one with the Self, the cessation of development, tranquil, benign, without a second (a-dvaita)—[such] they think is the fourth. That is the Self. That should be discerned."
na jayate mriyate va kadacin 'nayam bhutva bhavita va na bhuyah 'ajo nityah sasvato yam purano 'na hanyate hanyamane sarire
"For the atman there is neither birth nor death at any time. He has not come into being, does not come into being, and will not come into being. He is unborn, eternal, ever – existing and primeval. He is not slain when the body is slain". [Translation by A. C. Bhaktivedanta Swami Prabhupada (Srila Prabhupada)]
Srila Prabhupada, a great Vaishnava saint of the modern time further explains: "The atman does not take birth there, and the atman does not die... And because the atman has no birth, he therefore has no past, present or future. He is eternal, ever-existing and primeval – that is, there is no trace in history of his coming into being."
Since the quality of Atma is primarily consciousness, all sentient and insentient beings are pervaded by Atma, including plants, animals, humans and gods. The difference between them is the contracted or expanded state of that consciousness. For example, animals and humans share in common the desire to live, fear of death, desire to procreate and to protect their families and territory and the need for sleep, but animals' consciousness is more contracted and has less possibility to expand than does human consciousness.
When the Atma becomes embodied it is called birth, when the Atma leaves a body it is called death. The Atma transmigrates from one body to another body based on karmic [performed deeds] reactions.
In Hinduism, the Sanskrit word most closely corresponding to soul is Atma, which can mean soul or even God. It is seen as the portion of Brahman within us. Hinduism contains many variant beliefs on the origin, purpose, and fate of the atma. For example, advaita or non-dualistic conception of the atma accords it union with Brahman, the absolute uncreated (roughly, the Godhead), in eventuality or in pre-existing fact. Dvaita or dualistic concepts reject this, instead identifying the atma as a different and incompatible substance.
There are 25 coverings wrapped on our Atma (Reference Taken from Vaikunta Varnane written by Sanyasi Vadiraja Swami) 1. Iccha avarka, 2. Linga deha, 3. Avyakta Sharira, 4. Avidya Avarna, 5. Karma avarna, 6. Kama avarna, 7. Jeevacchadaka, 8. Paramacchadaka, 9. Narayana rupa avarna, 10. Vasudeva rupa Avarna, 11. Sankarshana rupa avarna, 12. Pradhyumna Avarka, 13. Anniruddha avarka, 14. Anniruddha Sharira, 15. Vasudeva Kavaca, 16. Narayana Kavaca, 17. Anandamaya kosha, 18. Vignanamaya kosha, 19. Manomaya kosha, 20. Vangmaya kosha, 21. Shrotrumaya kosha, 22. Chakshurmaya kosha, 23. Pranamaya kosha, 24. Annamaya kosha, 25. Gross Body.
According to Brahma Kumaris, soul is an eternal point of light, resides between forehead.
Islam teaches that the spirit (Ruh) is immortal and eternal, and that what a person does is recorded and will be judged at the final court of God. They will either go to heaven or hell, depending on whether or not they did well in the test that was given to them by Allah.
In Jainism every living being, from a plant or a bacterium to human, has a soul and the concept forms the very basis of Jainism. The soul (Jīva) is basically categorized in two based on its present state.
Irrespective of which state the soul is in, it has got the same attributes and qualities. The difference between the liberated and non-liberated souls is that the qualities and attributes are manifested completely in case of Siddha (liberated soul) as they have overcome all the karmic bondages whereas in case of non-liberated souls they are partially exhibited.
Concerning the Jain view of the soul, Virchand Gandhi quoted "the soul lives its own life, not for the purpose of the body, but the body lives for the purpose of the soul. If we believe that the soul is to be controlled by the body then soul misses its power".
The Hebrew terms נפש nephesh (literally "living being"), רוח ruach (literally "wind"), נשמה neshama (literally "breath"), חיה chaya (literally "life") and יחידה yechidah (literally "singularity") are used to describe the soul or spirit. In Judaism the soul is believed to be given by God to a person as mentioned in Genesis, "And the LORD God formed man [of] the dust of the ground, and breathed into his nostrils the breath of life; and man became a living being." Genesis 2:7. Judaism relates the quality of one's soul to one's performance of the commandments, mitzvot, and reaching higher levels of understanding, and thus closeness to God. A person with such closeness is called a tzadik. Therefore, Judaism embraces the commemoration of the day of one's death, nahala/Yahrtzeit and not the birthday as a festivity of remembrance, for only toward the end of life's struggles, tests and challenges could human souls be judged and credited - b'ezrat HaShem ("with God's help") - for righteousness and holiness. Judaism places great importance on the study of the souls.
The Scientology view is that a person IS a soul. They do not 'have' a soul. A person is immortal, and may be reincarnated if they wish. The Scientology term for the soul is "thetan", derived from the Greek word "theta", symbolizing thought. Scientology counselling (called 'auditing') addresses the soul to improve abilities, both worldly and spiritual.
According to Nadya Yuguseva, a shaman from the Altai, "'A woman has 40 souls; men have just one[.]'"
Sikhism considers Soul (atma) to be part of God (Waheguru). Various hymns are cited from the holy book "Sri Guru Granth Sahib" (SGGS) that suggests this belief. "God is in the Soul and the Soul is in the God." The same concept is repeated at various pages of the SGGS. For example: "The soul is divine; divine is the soul. Worship Him with love." and "The soul is the Lord, and the Lord is the soul; contemplating the Shabad, the Lord is found." The "Atma" or "Soul" according to Sikhism is an entity or "spiritual spark" or "light" in our body because of which the body can sustain life. On the departure of this entity from the body, the body becomes lifeless – No amount of manipulations to the body can make the person make any physical actions. The soul is the ‘driver’ in the body. It is the ‘roohu’ or spirit or atma, the presence of which makes the physical body alive. Many religious and philosophical traditions, support the view that the soul is the ethereal substance – a spirit; a non material spark – particular to a unique living being. Such traditions often consider the soul both immortal and innately aware of its immortal nature, as well as the true basis for sentience in each living being. The concept of the soul has strong links with notions of an afterlife, but opinions may vary wildly even within a given religion as to what happens to the soul after death. Many within these religions and philosophies see the soul as immaterial, while others consider it possibly material.
According to Chinese traditions, every person has two types of soul called hun and po (魂 and 魄), which are respectively yang and yin. Taoism believes in ten souls, sanhunqipo (三魂七魄) "three hun and seven po". The pò is linked to the dead body and the grave, whereas the hún is linked to the ancestral tablet. A living being that loses any of them is said to have mental illness or unconsciousness, while a dead soul may reincarnate to a disability, lower desire realms or may even be unable to reincarnate.
In theological reference to the soul, the terms "life" and "death" are viewed as emphatically more definitive than the common concepts of "biological life" and "biological death". Because the soul is said to be transcendent of the material existence, and is said to have (potentially) eternal life, the death of the soul is likewise said to be an eternal death. Thus, in the concept of divine judgment, God is commonly said to have options with regard to the dispensation of souls, ranging from Heaven (i.e., angels) to hell (i.e., demons), with various concepts in between. Typically both Heaven and hell are said to be eternal, or at least far beyond a typical human concept of lifespan and time.
In Helena Blavatsky's Theosophy, the soul is the field of our psychological activity (thinking, emotions, memory, desires, will, and so on) as well as of the so-called paranormal or psychic phenomena (extrasensory perception, out-of-body experiences, etc.). However, the soul is not the highest, but a middle dimension of human beings. Higher than the soul is the spirit, which is considered to be the real self; the source of everything we call "good"—happiness, wisdom, love, compassion, harmony, peace, etc. While the spirit is eternal and incorruptible, the soul is not. The soul acts as a link between the material body and the spiritual self, and therefore shares some characteristics of both. The soul can be attracted either towards the spiritual or towards the material realm, being thus the "battlefield" of good and evil. It is only when the soul is attracted towards the spiritual and merges with the Self that it becomes eternal and divine.
In Surat Shabda Yoga, the soul is considered to be an exact replica and spark of the Divine. The purpose of Surat Shabd Yoga is to realize one's True Self as soul (Self-Realisation), True Essence (Spirit-Realisation) and True Divinity (God-Realisation) while living in the physical body.
Similarly, the spiritual teacher Meher Baba held that "Atma, or the soul, is in reality identical with Paramatma the Oversoul — which is one, infinite, and eternal...[and] [t]he sole purpose of creation is for the soul to enjoy the infinite state of the Oversoul consciously."
The findings of science may be relevant to one's understanding of the soul depending on one's belief regarding the relationship between the soul and the mind. Another may be one's belief regarding the relationship between the soul and the body. Science has never proven, nor disproven the existence of a soul.
Neuroscience as an interdisciplinary field, and its branch of cognitive neuroscience particularly, operates under the ontological assumption of physicalism. In other words, it assumes—in order to perform its science—that only the fundamental phenomena studied by physics exist. Thus, neuroscience seeks to understand mental phenomena within the framework according to which human thought and behavior are caused solely by physical processes taking place inside the brain, and it operates by the way of reduction by seeking an explanation for the mind in terms of brain activity.
To study the mind in terms of the brain several methods of functional neuroimaging are used to study the neuroanatomical correlates of various cognitive processes that constitute the mind. The evidence from brain imaging indicates that all processes of the mind have physical correlates in brain function. However, such correlational studies cannot determine whether neural activity plays a causal role in the occurrence of these cognitive processes (correlation does not imply causation) and they cannot determine if the neural activity is either necessary or sufficient for such processes to occur. Identification of causation, and of necessary and sufficient conditions requires explicit experimental manipulation of that activity. If manipulation of brain activity changes consciousness, then a causal role for that brain activity can be inferred. Two of the most common types of manipulation experiments are loss-of-function and gain-of-function experiments. In a loss-of-function (also called "necessity") experiment, a part of the nervous system is diminished or removed in an attempt to determine if it is necessary for a certain process to occur, and in a gain-of-function (also called "sufficiency") experiment, an aspect of the nervous system is increased relative to normal. Manipulations of brain activity can be performed with direct electrical brain stimulation, magnetic brain stimulation using transcranial magnetic stimulation, psychopharmacological manipulation, optogenetic manipulation and by studying the symptoms of brain damage (case studies) and lesions. In addition, neuroscientists are also investigating how the mind develops with the development of the brain.
Physicist Sean M. Carroll has written that the idea of a soul is in opposition to quantum field theory (QFT). He writes that for a soul to exist: "Not only is new physics required, but dramatically new physics. Within QFT, there can’t be a new collection of 'spirit particles' and 'spirit forces' that interact with our regular atoms, because we would have detected them in existing experiments."
In contrast, Princeton Professor Hans Halvorson has highlighted a conceptual difficulty in making quantum mechanics logically consistent. His 2016 debate with Sean Carroll at Caltech on this subject is available from several sources on the web. Halvorson points out that some interpretations of the measurement problem in quantum mechanics seem to require an observation by a mind or conscious agent (see quantum mind) to collapse the wave function to obtain a determinate result. Since quantum mechanics posits a superposition as the normal state of matter, a material brain should also be in an indeterminate state much like Schrödinger's Cat. How then can it produce a determinate result? Halvorson argues that this logically necessitates something very like an immaterial soul that can make the observation and collapse the wave function. This general problem was first pointed out by physicist Eugene Wigner, who thought wave function collapse occurred due to the activities of mind. Theoretical physicist Roger Penrose and others have developed a similar outlook.
Quantum indeterminism has been invoked by some theorists as a solution to the problem of how a soul might interact with the brain but neuroscientist Peter Clarke found errors with this viewpoint, noting there is no evidence that such processes play a role in brain function; and concluded that a Cartesian soul has no basis from quantum physics.
Biologist Cyrille Barrette Barrette explains, using simple examples in a short self-published article, that the soul is a property emerging from the complex organisation of matter in the brain.has written that "the soul is a word to designate an idea we invented to represent the sensation of being inhabited by an existence, by a conscience".
Some parapsychologists have attempted to establish, by scientific experiment, whether a soul separate from the brain exists, as is more commonly defined in religion rather than as a synonym of psyche or mind. Milbourne Christopher (1979) and Mary Roach (2010) have argued that none of the attempts by parapsychologists have yet succeeded.
In 1901 Duncan MacDougall made weight measurements of patients as they died. He claimed that there was weight loss of varying amounts at the time of death, he concluded the soul weighed 21 grams. The physicist Robert L. Park has written that MacDougall's experiments "are not regarded today as having any scientific merit" and the psychologist Bruce Hood wrote that "because the weight loss was not reliable or replicable, his findings were unscientific."
In a mountainous kingdom in what is now southeastern Turkey, there lived in the eighth century B.C. a royal official, Kuttamuwa, who oversaw the completion of an inscribed stone monument, or stele, to be erected upon his death. The words instructed mourners to commemorate his life and afterlife with feasts "for my soul that is in this stele."
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