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A subtle body is one of a series of psycho-spiritual constituents of living beings, according to various esoteric, occult, and mystical teachings. According to such beliefs each subtle body corresponds to a subtle plane of existence, in a hierarchy or great chain of being that culminates in the physical form.
The subtle body (Sanskrit: sūkṣma śarīra) is important in several Indian religions such as Hinduism, Buddhism and Jainism, mainly in the forms which focus on Tantra and Yoga. According to Bhagavad Gita, one of the most sacred texts of Hinduism, the subtle body is composed of mind, intelligence and ego, which controls the gross physical body. In Buddhist Tantra, it is also called the ‘innate body’ (nija-deha) or the ‘uncommon means body’ (asadhdrana-upayadeha).
Other spiritual traditions teach similar ideas of a mystical or divine body, such as: "the most sacred body" (wujud al-aqdas) and "true and genuine body" (jism asli haqiqi) in Sufism, the meridian system in Chinese religion, and "the immortal body" (soma athanaton) in Hermeticism. The various attributes of the subtle body are frequently described in terms of often obscure symbolism: Tantra features references to the sun and moon as well as various Indian rivers and deities, while Taoist alchemy speaks of cauldrons and cinnabar fields.
Early mentions of subtle body (Sanskrit: sūkṣma śarīra) concepts appear in the Upanishads, particularly the earliest known theory appears in the Taittiriya Upanishad's (circa 4th or 5th centuries BCE) theory of five bodies or selves. The Taittiriya differentiates between five increasingly subtle body/selves: 
- The anna-maya ("food body", physical body/self),
- The prana-maya (body made of vital breath or prana),
- The mano-maya (body made of mind),
- The vijñana-maya (body made of consciousness)
- The ananda-maya (bliss body).
The Taittiriya also contains passages which suggests a theory of a subtle internal anatomy which includes the concept of a central channel (nadi). In later Vedic texts called samhitas and brahmanas one also finds a theory of five "winds" or "breaths" (vayus, pranas):
- Prāṇa, associated with inhalation
- Apāna, associated with exhalation
- Uḍāna, associated with distribution of breath within the body
- Samāna, associated with digestion
- Vyāna, associated with excretion of waste
A millennium later, these concepts were adapted and refined by various spiritual traditions. The similar concept of the Liṅga Śarīra is seen as the vehicle of consciousness in later Samkhya, Vedanta, and Yoga, and is propelled by past-life tendencies, or bhavas. Linga can be translated as "characteristic mark" or "impermanence" and the term Sarira (Vedanta) as "form" or "mold". Karana or "instrument" is a synonymous term. In the Classical Samkhya system of Isvarakrsna (ca. 4th century CE), the Lińga is the characteristic mark of the transmigrating entity. It consists of twenty-five tattvas from eternal consciousness down to the five organs of sense, five of activity (buddindriya or jñānendriya, and karmendriya respectively) and the five subtle elements that are the objects of sense (tanmatras) The Samkhyakarika says:
The subtle body (linga), previously arisen, unconfined, constant, inclusive of the great one (mahat) etc , through the subtle elements, not having enjoyment, transmigrates, (because of) being endowed with bhavas ("conditions" or "dispositions").
As a picture (does) not (exist) without a support, or as a shadow (does) not (exist) without a post and so forth; so too the instrument (linga or karana) does not exist without that which is specific (i.e. a subtle body).
The classical Vedanta tradition developed the theory of the five bodies into the theory of the koshas "sheaths" or "coverings" which surround and obscure the self (atman). In classical Vedanta these are seen as obstacles to realization and traditions like Shankara's Advaita Vedanta had little interest in working with the subtle body.
In Tantra traditions meanwhile (Shaiva Kaula, Kashmir Shaivism and Buddhist Vajrayana), the subtle body was seen in a more positive light, offering potential for yogic practices which could lead to liberation. Tantric traditions contain the most complex theories of the subtle body, with sophisticated descriptions of energy nadis (literally "stream or river", channels through which vayu and prana flows) and chakras (lit. "circles") which are points of focus where nadis meet. The main channels, shared by both Hindu and Buddhist systems, are the central (in Hindu systems: susumna; in Buddhist: avadhuti), left and right (in Hindu systems: ida and pingala; Buddhist: lalana and rasana). Further subsidiary channels are said to radiate outwards from the chakras, where the main channels meet. There are various chakra systems depending on the tantra; the Netra tantra describes six chakras, the Kaulajñana-nirnaya describes eight, and the Kubjikamata Tantra describes seven (the most widely known set of chakras).
The modern Indian spiritual teacher Meher Baba stated that the subtle body "is the vehicle of desires and vital forces," He held that the subtle body is one of three bodies with which the soul must cease to identify in order to realize God.
In Buddhist Tantra, the subtle body is termed the ‘innate body’ (nija-deha) or the ‘uncommon means body’ (asadhdrana-upayadeha). It is also called sūkṣma śarīra, rendered in Tibetan as traway-lu (transliterated phra ba’i lus). 
The subtle body consists of thousands of subtle energy channels (nadis), which are conduits for energies or "winds" (lung or prana) and converge at chakras. According to Dagsay Tulku Rinpoche, there are three mains channels (nadis), central, left and right; "their beginning point is located between a person's eyebrows. From there, they run upward to the crown chakra. The passage then parallels the spine, running through all seven chakras - the centers of subtle energy - and ending about two inches below the belly button."
Buddhist tantras generally describe four or five chakras in the shape of a lotus with varying petals. For example, the Hevajra Tantra (8th century) states:
In the Center [i.e. cakra] of Creation [at the sexual organ] a sixty-four petal lotus. In the Center of Essential Nature [at the heart] an eight petal lotus. In the Center of Enjoyment [at the throat] a sixteen petal lotus. In the Center of Great Bliss [at the top of the head] a thirty-two petal lotus.
H. P. Blavatsky's Theosophy, a hybrid form of 19th-century Western occultism, pointed to the Perennial philosophy as the ancient source and common inheritance of all humanity and sought to systematically delineate and define the underlying uniformity of esoteric conception behind all great religious/philosophical traditions. The Secret Doctrine, and The Key to Theosophy pointed to the correspondence of the Vedantic concept of the five koshas with the Platonic and Pythagorean principles of human nature, with statements in the Zohar and the Christian Bible, and with the Brahminical system of Taraka Raja Yoga. She showed how all these traditions could be better understood in their esoteric meaning by reference to a seven-fold sub-division of human nature as given in the "Trans-Himalayan" Arhat Esoteric School,  which refers to three principles (other than the physical form) which compose the incarnated personality:
- "Prana" - the "Life Force", the breath of Life
- Linga Sharira - the Double or Astral body, the vehicle of Prana
- Kama rupa - the "desire-body," the seat of animal desires and passions
During incarnated existence, these are ruled by Manas - the human mind, which is dual in nature and which provides the link between the deathless, immortal Monad above and the transitory vestures of incarnation. Lower manas is linked with the Sukshmopadhi in the Raja Yoga system or the Human Soul in the Theosophical conception. It allows for reason, judgement and choice in contact with the lower planes of earthly life. Manas is however, also potentially the vehicle of the Higher Mind, called Buddhi-Manas or "the Causal Body (the United 5th and 6th principles)" when not drawn downwards by identification with the transitory personality, by personal desires and afflictive emotions, "the more intimate astral."
The Linga Sharira is the invisible double of the human body, elsewhere referred to as the etheric body. It is the astral or "design" body which serves as a model or matrix for the physical. The linga sarira is connected with the capacity for clairvoyance and clairaudience and for much of the psychic phenomena which is currently unexplainable by modern science and psychology. Among it's many unknown features and capacities, it can be separated or projected a limited distance from the body. When separated from the body it can be wounded by sharp objects. When it returns to the physical frame, the wound will be reflected in the physical counterpart, a phenomenon called "repercussion". At death, it fuses with kama and the lower elements of the terrestrial mind (called lower manas) and depending upon the severity of its earthly attachments, slowly disintegrates or decomposes. While in various stages of disintegration, it forms the post-mortem Kama-rupa, a disintegrating, soul-less and conscience-less entity which can under certain conditions appear in seances and is the source of "spooks", "shells" or apparitions of the dead.  It is for this reason that Blavatsky condemned the practice of attempting to evoke or arouse the presence of deceased persons through mediums, psychics or other means.
The higher part of the incarnated ray of Manas, containing the spiritual knowledge gathered during each life, if successfully completing the course of evolution, eventually self-consciously merges entirely into its divine source, which is not a body at all, but a divine, immortal essence called the Sutratma or "Thread Soul" in Eastern traditions. Though linked with the higher "kosas" or "upadhis" in the Vedantic and Brahminical traditions, Blavatsky explained that the Spiritual Soul within human nature would be more properly understood in terms of universal principles and spiritual essences, beyond time and space and absent of the any of the limitations of finite forms, devoid of human ego or personality. As the source and origin of akashic wisdom and divine compassion, this higher triad of principles could yet become the foundation for an interminable series of voluntary reincarnations for the sake of aiding all others, via a purified "permanent astral" vesture as in the case of a Bodhisatvic "nirmanakaya", the highest ideal of Mahayana Buddhism. 
Blavatskian Theosophy was co-opted, re-mixed and revised by many later authors who sought to lend authenticity and authority to their teachings. This can be seen for example in the writings of C.W. Leadbeater and Annie Besant where the astral/desire body was renamed the "mayavi-rupa" and then divided into two different bodies: the emotional and the mental. They also juggled with the terms and definitions given by Blavatsky and proposed a series of four subtle bodies:
- Etheric body (vehicle of prana)
- Emotional or astral body (vehicle of desires and emotions)
- Mental body (vehicle of the concrete or lower mind)
- Causal body (vehicle of the abstract or higher mind)
The later Theosophical arrangement was taken up by Alice Bailey, and from there found its way (with variations) into the New Age worldview. It is also associated with the human aura observed through Kirlian photography and Kilner screens. The anthroposophical view of the human being found in Rudolf Steiner's Anthroposophical teachings usually referred to only the Etheric and Astral Bodies. However, Steiner also used a threefold classification of body, soul, and spirit as well as a sevenfold and a ninefold description.
Max Heindel divided the subtle body into: Vital Body made of Ether, our instrument for specializing the vital energy of the sun, seen by clairvoyant vision to extend about an inch and a half outside the body; the Desire body, which is our emotional nature and pervades both the vital and dense bodies, seen by clairvoyant vision to extend about 16 inches outside our visible body, related to the Desire World; and the Mental body, which functions like a mirror, reflects the outer world and enables the Ego to transmit its commands as thought, word and action. The human being is seen as a threefold Spirit, possessing a Mind by which he governs the threefold Body that he transmutes into a threefold Soul. The Human Spirit aspect has emanated from itself the desire body to be transmuted into the Emotional Soul; the Life Spirit aspect has emanated from itself the vital body to be transmuted into the Intellectual Soul; the Divine Spirit aspect has emanated from itself the dense body to be transmuted into the Conscious Soul.
Samael Aun Weor wrote extensively on the subtle vehicles, organizing them in accordance with the kabbalistic Tree of Life. The common person only contains the lunar vehicles of emotion (astral body), thought (mental body), and will (causal body), concentrations of the collective animalistic intelligence, the evolution of the Essence through the mineral, plant and animal kingdoms. Becoming human means to have a soul, a Solar Astral Body, Solar Mental Body and Solar Causal Body. These bodies are constructed through a form of Tantra called White tantrism.
Barbara Brennan's account of the subtle bodies in her books Hands of Light and Light Emerging refers to the subtle bodies as "layers" in the "Human Energy Field" or aura. Causality proceeds downwards: each of the layers has its own characteristics and can have its own expression of disease, requiring individual healing. As with the Adyar arrangement, each body or aura also has its own complement of chakras, which interrelate to those in the other layers.
An interesting variant on the concept of subtle bodies is found in both Alchemical Taoism and the "Fourth Way" teachings of Gurdjieff and Ouspensky, where it is said that one can create a subtle body, and hence achieve post-mortem immortality, through spiritual or yogic exercises. The "soul" then is not something one is born with, but something that one has to develop through esoteric practice.
According to (Rosenthal, 1997) "In Gurdjieff's cosmology our nature is tripartite and is composed of the physical (planetary), emotional (astral) and mental (spiritual) bodies; in each person one of these three bodies ultimately achieves dominance." The Fourth way as taught by Gurdjieff and Ouspensky is a philosophy of developing the divine body which is gained when one has complete understanding and self perfection. The ultimate task of the fourth way teachings is to harmoniously develop the four bodies into a single way.
Aleister Crowley and the Body of Light
The work of the Body of Light was part of English author and occultist Aleister Crowley's system of magick, saying in his Magick (Book 4) that it must be developed by rigid discipline, including rituals and the "assumption of god-forms", as well as by practice and experience.
From Crowley's Magick Without Tears (Ch. 81):
One passes through the veil of the exterior world (which, as in Yoga, but in another sense, becomes "unreal" by comparison as one passes beyond) one creates a subtle body (instrument is a better term) called the body of Light; this one develops and controls; it gains new powers as one progresses, usually by means of what is called "initiation:" finally, one carries on almost one's whole life in this Body of Light, and achieves in its own way the mastery of the Universe.
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