A kosha (also kosa; Sanskrit कोश, IAST: ), usually rendered "sheath", is a covering of the Atman, or Self according to Vedantic philosophy. The five sheaths, summarised with the term Panchakosha, are described in the Taittiriya Upanishad (2.1-5),David Frawley, Yoga and the Sacred Fire: Self-Realization and Planetary Transformation, p.288 and they are often visualised as the layers of an onion. From gross to fine they are:
Panchakoshas are divided in three bodies:
The atman is behind the Panchakoshas. According to Vedanta the wise person, being aware of the subtle influences of the five elements within each kosha, ever discerns the Self amidst appearances.
Anna means matter, annam literally means food; Taittiriya Upanishad calls food the medicament of all. The gross body which is matter-born and matter sustained and transient and subject to perception is the Annamayakosha whose origin is food eaten by parents. It is visible, dependent and impure. It is not the atman because it did not exist before its origination and ceases to exist once it is destroyed. It is subject to origination and destruction every moment. It is the anatman because it is not in the beginning and at the end, is non-existent also in the present. It does not know itself. The deluded mind that does not inquire considers his atman to be this body or kosha. Such a person cannot enjoy bliss.
Pranamayakosha, separate from and subtler than Annamayakosha, pertains to the Sukshma sarira, it is the sheath of the vital airs completely enclosing and filling the Annamayakosha. The Prana in combination with the five organs of action constitutes the Pranamayakosha. The Annamayakosha is an effect of the Pranamayakosha. The Annamayakosha gets life by the Prana entering into it and engages in all kinds of action. Prana is the life of beings and the Universal life. Whatever happens in the Annamayakosha is wrongly identified as belonging to the atman by reason of its being pervaded by the Pranamayakosha which is effect of Vayu, and totally unaware and dependent.
Manomayakosha belongs to the Suksma sarira. It is the "self" having Pranamayakosha as its body. The organs of knowledge and the mind form this kosha which is the cause of the sense of the "I" and of the "mine" and of the varying conceptions. It creates difference of names etc., because organs of knowledge are dependent on and determined by the mind which is of the nature of determination and doubt. It is powerful because bondage and liberation depend on the mind which producing attachment binds a person and which by creating aversion for them liberates them from that self-made bondage. It pervades the Pranamayakosha. It is the sacrificial fire, the five organs are the priests who pour into this fire the oblations of sense-objects, which fire fuelled by various vasanas burns out the world created and expanded by the mind that when fouled by rajas ("projection") and tamas ("concealment") superimposes the samsara but when free of rajas and tamas can bring about the state of being established in Brahman.
Vijnanamaya kosha also belongs to the Suksma sarira and pervades the Manomayakosha that pervades the Pranamayakosha which pervades the Annamayakosha. Buddhi with its organs of knowledge and its actions having the characteristics of an agent is the Vigyanakosha, the cause of samsara. It has the power of reflection of the chaitanya which it accompanies as a modification of Prakrti ( avidya) and characterised by knowledge and action and always identified with the body, organs etc. This kosha is endowed with jnana and to it belong the waking and dream states and the experiences of joy and sorrow. Being very luminous in close proximity of the Paramatman deluded by which upadhi it is subject to samsara, this atman which is compacted of vigyanana and shining in the heart near the pranas being immutable becomes a doer and enjoyer in the midst of the upadhis. Its "jivabhava-existential-character" i.e. Jivahood, persists so long as there is delusion as it is born of mithyajnana. Though avidya is beginningless it is not eternal.
Anandamaya kosha is the last layer and it is the closest layer to the Atman. It is a modification of avidya and appears as a reflection of the atman compacted of absolute bliss. It is fully manifested in the dreamless deep sleep. It is not the atman because it is connected with upadhis ("limitations") and a modification of Prakrti as an effect of good deeds.
The Vedanta conceives the expression of the gross universe possible by traversing through all these stages of emanation from the cloud of Maya covering the face of Brahman to Sthula bhutas or gross matter with all its multifarious aspect including gross energy. Badarayana, drawing attention to ’s grammar (V.iv.21), explains that the suffix mayat as in Annamaya (made of food), Pranamaya (made of vital air) etc., besides conveying the meaning "made of" has also the sense of abundance and plenitude as wellBrahma Sutra I.i.13 for which reason it is repeatedly said - Brahman is the Blissful (Anandamaya) Self.
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