Purusha Sukta
Purusha sukta (IAST "", Devanāgarī पुरुषसूक्तम्) is hymn 10.90 of the Rigveda, dedicated to the Purusha, the "Cosmic Being". It is also found in the Shukla Yajurveda Samhita 30.1-16 and Atharva Veda Samhita 19.6. Slightly different versions of the Sukta appear in different Vedas. One version of the suktam has 16 verses, 15 in the meter, and the final one in the meter. Another version of the Sukta consists of 24 verses with the first 18 mantras designated as the "Purva-narayana" and the later portion termed as the "Uttara-narayana" probably in honour of Rishi Narayana. Some  scholars state that certain verses of Purusha Sukta are later interpolations to the Rigveda. One of the reasons given is that it is the only hymn in all the Vedas that mentions the four varnas by name - although the word "varṇa" itself is not mentioned in the hymn. Contents. The Purusha Sukta gives a description of the spiritual unity of the universe. It presents the nature of Purusha, or the cosmic being, as both immanent in the manifested world and yet transcendent to it. From this being, the Sukta holds, the original creative will (identified with Viswakarma, Hiranyagarbha or Prajapati ) proceeds which causes the projection of the universe in space and time. The Purusha Sukta, in the seventh verse, hints at the organic connectedness of the various classes of society. Purusha. The Purusha is defined in verses 2 to 5 of the Sukta. He is described as a being who pervades everything conscious and unconscious universally. He is poetically depicted as a being with thousand heads, eyes and legs, enveloping not just the earth, but the entire universe from all sides and transcending it by ten fingers length - or transcending in all 10 dimensions. All manifestations, in past, present and  future, is held to be the Purusha alone. It is also proclaimed that he transcends his creation. The immanence of the Purusha in manifestation and yet his transcendence of it is similar to the viewpoint held by panentheists. Finally, his glory is held to be even greater than the portrayal in this Sukta. Creation. Verses 5-15 hold the creation of the Rig Veda. Creation is described to have started with the origination of Virat, or the cosmic body from the Purusha. In Virat, omnipresent intelligence manifests itself which causes the appearance of diversity. In the verses following, it is  held that Purusha through a sacrifice of himself, brings forth the avian, forest-dwelling and domestic animals, the three Vedas, the metres (of the mantras). Then follows a verse which states that from his mouth, arms, thighs, feet the four varnas (categories) are born. This four varna-related verse is controversial and is believed by many scholars, such as Max Müller, to be a corruption and a medieval or modern era insertion into the text. After the verse, the Sukta states that the moon takes birth from the Purusha's mind and the sun from his eyes. Indra and Agni  descend from his mouth and from his vital breath, air is born. The firmament comes from his navel, the heavens from his head, the earth from his feet and quarters of space from his ears. Through this creation, underlying unity of human, cosmic and divine realities is espoused, for all are seen arising out of same original reality, the Purusha. Yajna. The Purusha Sukta holds that the world is created by and out of a Yajna or exchange of the Purusha. All forms of existence are held to be grounded in this primordial yajna. In the seventeenth verse, the concept  of Yajna itself is held to have arisen out of this original sacrifice. In the final verses, yajna is extolled as the primordial energy ground for all existence. Context. The Sukta gives an expression to immanence of radical unity in diversity and is therefore, seen as the foundation of the Vaishnava thought, Bhedabheda school of philosophy and Bhagavata theology. The concept of the Purusha is from the Samkhya Philosophy which is traced to the Indus Valley period (OVOP). It seems to be an interpolation into the Rigveda since it is out of character with the other hymns dedicated to nature  gods. The Purusha Sukta is repeated with some variations in the Atharva Veda (19.6). Sections of it also occur in the Panchavimsha Brahmana, Vajasaneyi Samhita and the Taittiriya Aranyaka. Among Puranic texts, the Sukta has been elaborated in the Bhagavata Purana (2.5.35 to 2.6.1-29) and in the Mahabharata (Mokshadharma Parva 351 and 352). The Purusha Sukta is mirrored directly in the ancient Zoroastrian texts, found in the Avesta Yasna and the Pahlavi Denkard. There, it is said that the body of man is in the likeness of the four estates, with priesthood at the head, warriorship in the hands , husbandry in the belly, and artisanship at the foot. Nevertheless, it remains to be established that the Indian and Pahlavi texts reflect inherited common beliefs, rather than independent developments. Hence, making a later insertion unlikely. Authenticity. Many 19th and early 20th century scholars questioned as to when parts or all of Purusha Sukta were composed, and whether some of these verses were present in the ancient version of Rigveda. They suggest it was interpolated in post-Vedic era and is a relatively modern origin of Purusha Sukta. B. V. Kamesvara Aiyar, another 19th-century scholar, on the other hand, disputed  this idea: Scholarship on this and other Vedic topics has moved on decisively since the end of the twentieth century, especially since the major publications of Brereton & Jamison and many others, and views such as the above are nowadays of interest only as part of the history of indology, and not as contributions to contemporary scholarship. Modern scholarship. The verses about social estates in the Purusha Sukta are considered to belong to the latest layer of the Rigveda by scholars such as V. Nagarajan, Jamison and Brereton. V. Nagarajan believes that it was an "interpolation" to give "divine sanction" to  an unequal division in society that was in existence at the time of its composition. He states "The Vedic Hymns had been composed before the Varna scheme was implemented. The Vedic society was not organized on the basis of varnas. The Purusha Sukta might have been a later interpolation to secure Vedic sanction for that scheme". Stephanie Jamison and Joel Brereton, a professor of Sanskrit and Religious studies, state, "there is no evidence in the Rigveda for an elaborate, much-subdivided and overarching caste system", and "the varna system seems to be embryonic in the Rigveda and, both then and  later, a social ideal rather than a social reality".