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The Upanishads (Devanagari: उपनिषद्, IAST: upaniṣad, also spelled "Upanisad") are Hindu scriptures that constitute the core teachings of Vedanta. They do not belong to any particular period of Sanskrit literature: the oldest, such as the Brhadaranyaka and Chandogya Upanishads, date to the late Brahmana period (around the middle of the first millennium BCE), while the latest were composed in the medieval and early modern period. The Upanishads have exerted an important influence on the rest of Hindu philosophy and were collectively considered one of the 100 Most Influential Books Ever Written by the British poet Martin Seymour-Smith.
The philosopher and commentator Shankara is thought to have composed commentaries on eleven mukhya or principal Upanishads, those that are generally regarded as the oldest, spanning the late Vedic and Mauryan periods. The Muktika Upanishad (predates 1656) contains a list of 108 canonical Upanishads and lists itself as the final one. Although there are a wide variety of philosophical positions propounded in the Upanishads, commentators since Shankara have usually followed him in seeing idealist monism as the dominant one.
Dara Shikoh (d. 1659), son of the Mughal emperor Shah Jahan, translated fifty Upanishads into Persian. Max Müller (1879) was aware of 170. Sadhale, in his massive verse index Upaniṣad-vākya-mahā-kośa, has drawn on 223 different extant texts that call themselves by this name. Additionally, parts of earlier texts, of Brahmanas or passages of the Vedas themselves, are sometimes considered Upanishads.
The Sanskrit term upaniṣad derives from upa- (nearby), ni- (at the proper place, down) and sad, that is "sitting down near" a teacher in order to receive instruction - "laying siege" to the teacher, as Schayer puts it. Monier-Williams adds that "according to native authorities upanishad means 'setting to rest ignorance by revealing the knowledge of the supreme spirit');..." A gloss of the term upaniṣad based on Shankara's commentary on the Kaṭha and Bṛhadāraṇyaka Upanishads equates it with Ātmavidyā, that is "knowledge of the Self", or Brahmavidyā "knowledge of Brahma". Other dictionary meanings include "esoteric doctrine" and "secret doctrine".
The Upanishads speak of a universal spirit (Brahman) and of an individual soul (Atman), and at times assert the identity of both. Brahman is the ultimate, both transcendent and immanent, the absolute infinite existence, the sum total of all that ever is, was, or shall be. The mystical nature and intense philosophical bent of the Upanishads has led to their explication in numerous manners, giving birth to three main schools of Vedanta. Shankara's exegesis of the Upanishads does not describe Brahman as the God in a monotheistic sense. His philosophy is named advaita, "not two" as opposed to dvaita, founded by Madhvacharya, which holds that Brahman is ultimately a personal God, to be aligned with Vishnu, or Krishna (brahmano hi pratisthaham, I am the Foundation of Brahman Bhagavad Gita 14.27). The third major school of Vedanta is Vishishtadvaita, founded by Ramanujacharya and it has some aspects in common with the other two.
The ninth chapter of the Taittiriya Upanishad says:
- He who knows the Bliss of Brahman (divine consciousness)..does not distress himself with the thought "why did I not do what is good? why did I do what is evil?". Whoever knows this (bliss) regards both of these as Atman (self, soul), indeed he cherishes both as Atman. Such, indeed, is the Upanishad, the secret knowledge of Brahman.
The key phrase of the Upanishads, to Advaita Vedanta, is तत् त्वं असि "Tat Tvam Asi" (That thou art). Vedantins believe that in the end, the ultimate, formless, inconceivable Brahman is the same as our soul, Atman. We only have to realize this through discrimination. (However, interpretations of this phrase differ.) Verses 6, 7 & 8 of Isha Upanishad:
- Whoever sees all beings in the soul and the soul in all beings...
What delusion or sorrow is there for one who sees unity?
It has filled all. It is radiant, incorporeal, invulnerable...
Wise, intelligent, encompassing, self-existent,
It organizes objects throughout eternity.
- Whoever sees all beings in the soul and the soul in all beings...
The Upanishads also contain the first and most definitive explications of the divine syllable Aum or OM, the cosmic vibration that underlies all existence. The mantra "Aum Shanti Shanti Shanti" (the soundless sound, peace, peace, peace)is often found in the Upanishads. 'Devotion to God' (Sanskrit: bhakti) is foreshadowed in Upanishadic literature, and was later realized by texts such as the Bhagavad Gita.
List of Upanishads
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The following list includes the eleven "principal" (mukhya) Upanishads commented upon  by Shankara, and accepted as shruti by most Hindus. Each is associated with one of the four Vedas (Rigveda (ṚV), Samaveda (SV), White Yajurveda (ŚYV), Black Yajurveda (KYV), Atharvaveda (AV));
- Aitareya (ṚV)
- Bṛhadāraṇyaka (ŚYV)
- Taittirīya (KYV)
- Chāndogya (SV)
- Kena (SV)
- Īṣa (ŚYV)
- Kaṭha (KYV)
- Muṇḍaka (AV)
- Māṇḍūkya (AV)
- Praśna (AV)
The Kauśītāki and Maitrāyaṇi Upanishads are sometimes added. All these date from before the Common Era. From linguistic evidence, the oldest among them are the Bṛhadāraṇyaka and Chāndogya Upanishads. The Jaiminīya Upaniṣadbrāhmaṇa, belonging to the late Vedic Sanskrit period, may also be included. Of nearly the same age are the Aitareya, Kauṣītaki and Taittirīya Upaniṣads, while the remnant date from the time of transition from Vedic to Classical Sanskrit.
The older Upanishads are associated with Vedic Charanas, Shakhas or schools; the Aitareya and Kauśītāki Upanishads with the Shakala shakha, the Chāndogya Upanishad with the Kauthuma shakha, the Kena Upanishad with the Jaiminiya shakha, the Kaṭha Upanishad with the Caraka-Katha shakha, the Taittirīya and Śvetāśvatara Upanishads with the Taittiriya shakha, the Maitrāyaṇi Upanishad with the Maitrayani shakha, the Bṛhadāraṇyaka and Īṣa Upanishads with the Vajasaneyi Madhyandina shakha, and the Māṇḍūkya and Muṇḍaka Upanishads with the Shaunaka shakha.
In the Muktika Upanishad's list of 108 Upanishads the first 10 are grouped as mukhya "principal". 21 are grouped as Sāmānya Vedānta "common Vedanta", 23 as Sannyāsa, 9 as Shākta, 13 as Vaishnava, 14 as Shaiva and 17 as Yoga Upanishads. 
Later Upanisads are often highly sectarian: this was "one of the strategies used by sectarian movements to legitimate their own texts through granting them the nominal status of Śruti." For the most part, the canonical Shakta Upanishads are sectarian tracts reflecting doctrinal and interpretative differences between the two principal sects of Srividya upasana (a major Tantric form of Shaktism). As a result, the many extant listings of "authentic" Shakta Upanisads vary in content, reflecting the sectarian bias of their compilers:
"Past efforts to construct lists of Shakta Upanisads have left us no closer to understanding either their 'location' in Tantric tradition or their place within the Vedic corpus. [...] At stake for the Tantric is not the authority of sruti per se, which remains largely undisputed, but rather its correct interpretation. For non-Tantrics, [it is a text's] Tantric contents that brings into question its identity as an Upanisad. At issue is the text's classification as sruti and thus its inherent authority as Veda." 
Of the texts listed in the Muktika Upanishad nine are classified as Shakta Upanishads:
- Sītā (AV)
- Annapūrṇa (AV)
- Devī (AV)
- Tripurātapani (AV)
- Tripura (RV)
- Bhāvana (AV)
- Saubhāgya (RV)
- Sarasvatīrahasya (KYV)
- Bahvṛca (RV)
The list excludes several notable and widely used Shakta Upanisads, including the Kaula Upaniṣad, the Śrīvidyā Upaniṣad and the Śrichakra Upaniṣad f.
Renown outside India
The Vedas became known outside India when the Upanishads were translated from Sanskrit, first into Persian as a result of Emperor Akbar's liberal religious attitude. Shah Jehan was influenced by the Emperor and shared his viewpoint. His eldest son, named Dara Shikoh, a liberal Muslim like his father, wrote a book that attempted to reconcile Islam with Hinduism. In 1640, Dara Shikoh visited Kashmir and met pandits, who told him about the Upanishads and later invited pandits from Benares to come to Delhi, which was under Mughal control, in order to assist in translating them. In 1657 the translation was completed. Known by the name Sirr-e-Akbar (The Greatest Mystery), the introduction states that the Qur'an's "Kitab al-maknun" or hidden book is none other than the Upanishads.
Two years later, in 1659, his brother Aurangzeb, who was a strict Muslim, had him executed under Sharia law as an apostate from Islam. This may have been a pretext, because Aurangzeb ascended the throne after Shikoh's execution.
In 1775, the French scholar Anquetil Duperron received a manuscript of part of the Upanishads from M. Gentil, who resided at the court of Shula ud daula. Duperron requested the remaining part and then collated the two, translating them into French and Latin. The French version was never published but the Latin translation was published in 1801. The Latinized title was Oupnek'hat.
The German philosopher Schopenhauer read the Latin translation and extravagantly  praised it in his main work, The World as Will and Representation, which was published in 1819, as well as in his Parerga and Paralipomena, (1851). He found that the Upanishads accorded with his own philosophy, which taught that the individual is a manifestation of the one basis of reality. For Schopenhauer, that fundamentally real underlying unity is what we know in ourselves as "will."
German philosopher Friedrich Wilhelm Joseph Schelling praised the mystical and spiritual aspects of the Upanishads. Schelling and other members of the German Idealist group were dissatisfied with Christianity (as propagated by churches) and became fascinated with the Vedas and the Upanishads. Similarly–minded English and European writers, such as Thomas Carlyle, Victor Cousin, Samuel Taylor Coleridge, and Mme. de Staël, claimed to find deep wisdom in these non–Western writings.
In the United States, the group known as the Transcendentalists were influenced by Schelling's German Idealists. These Americans, such as Emerson and Thoreau, were not satisfied with traditional Christian mythology and therefore embraced Schelling's interpretation of Kant's Transcendental idealism, as well as his celebration of the romantic, exotic, mystical aspect of the Upanishads. As a result of the influence of these writers, the Upanishads gained renown in Western countries.
Erwin Schrodinger—the great quantum physicist said "The multiplicity is only apparent. This is the doctrine of the Upanishads. And not of the Upanishads only. The mystical experience of the union with God regularly leads to this view, unless strong prejudices stand in the West."
Modern criticism of Upanishadic transcendentalism
The Upanishadic thinkers came to consider change as a mere illusion, because it could not be reconciled with a permanent and homogeneous reality. They were therefore led to a complete denial of plurality. According to David Kalupahana, "Although the search for an essential unity of things was crowned with success, philosophy suffered a severe setback as a result of this transcendentalism." Paul Deussen wrote on this unity: "This unity excluded all plurality, and therefore, all proximity in space, all succession in time, all interdependence as cause and effect, and all opposition as subject and object." According to Kalupahana, "Reality was considered to be beyond space, time, change, and therefore causality. Change is a mere matter of words, nothing but a name (vaacaarambhanam vikaro naamadheyam). After this, metaphysical speculation took the upper hand, and any serious attempt to give a rational explanation of the things of experience is lacking in the Upanishads."
Dalit activist and Buddhist convert Bhimrao Ambedkar contended that the philosophy of the Upanishads "turned out to be most ineffective and inconsequential piece of speculation with no effect on the moral and social order of the Hindus."
- Brodd, Jefferey (2003). World Religions. Winona, MN: Saint Mary's Press. ISBN 978-0-88489-725-5.
- Sris Chandra Sen (1937). The Mystic Philosophy of the Upanishads. General Printers \& Publishers. Chapter: VEDIC LITERATURE AND UPANISHADS. p. 19: "..according to the Vedas to which they are supposed to belong, ... The muktika list of 108 upanishad is as follows:"
- Randall Collins, The Sociology of Philosophies: A Global Theory of Intellectual Change. Harvard University Press, 2000, page 195 : "The breakdown of the Vedic cults is more obscured by retrospective ideology than any other period in Indian history. It is commonly assumed that the dominant philosophy now became an idealist monism, the identification of atman (self) and Brahman (Spirit), and that this mysticism was believed to provide a way to transcend rebirths on the wheel of karma. This is far from an accurate picture of what we read in the Upanishads. It has become traditional to view the Upanishads through the lens of Shankara's Advaita interpretation. This imposes the philosophical revolution of about 700 C.E. upon a very different situation 1,000 to 1,500 years earlier. Shankara picked out monist and idealist themes from a much wider philosophical lineup."
- Patrick Olivelle, Upaniṣads. Oxford University Press, 1998, page 4: "In this Introduction I have avoided speaking of 'the philosophy of the upanishads', a common feature of most introductions to their translations. These documents were composed over several centuries and in various regions, and it is futile to try to discover a single doctrine or philosophy in them."
- Ariel Glucklich, The Strides of Vishnu: Hindu Culture in Historical Perspective. Oxford University Press US, 2008, page 70: "The Upanishadic age was also characterized by a pluralism of worldviews. While some Upanishads have been deemed 'monistic', others, including the Katha Upanishad, are dualistic."
- Gregory P. Fields, Religious Therapeutics: Body and Health in Yoga, Āyurveda, and Tantra. SUNY Press, 2001, page 26: "The Maitri is one of the Upanishads that inclines more toward dualism, thus grounding classical Samkhya and Yoga, in contrast to the non-dualistic Upanishads eventuating in Vedanta."
- For instances of Platonic pluralism in the early Upanishads see Randall Collins, The Sociology of Philosophies: A Global Theory of Intellectual Change. Harvard University Press, 2000, pages 197-198.
- S. Gajanan Shambhu Sadhale, Sri Garibdass Oriental Series, no. 44. (Delhi: Sri Satguru Publications, 1987).
- Cf. Arthur Anthony Macdonell. A Practical Sanskrit Dictionary. p. 53.
- Stanislaw Schayer. Die Bedeutung des Wortes Upanisad. Rocznik Orientalistyczny 3,1925, 57-67)
- Monier-Williams. A Sanskrit-English Dictionary. p. 201.  Web version accessed 1 April 2007.
- Smith 10)
- Tat tvam asi in Context. Zeitschrift der Deutschen Morgenländischen Gesellschaft 136, 1986, 98-109
- Catherine Robinson, Interpretations of the Bhagavad-Gītā and Images of the Hindu Tradition: The Song of the Lord. Routledge Press, 1992, page 51.
- ".:SAKSIVC: Vedic Literature: Upanishads: 108 Upanishads:.". www.vedah.com. http://www.vedah.com/org/literature/upanishads/108Upanishads.asp. Retrieved 2008-04-26.
- Translated by Dr.A.G.Krishna Warrier. "Muktika Upanishad". TheTheosophicalPublishingHouse,Chennai. http://www.egr.msu.edu/~sundare2/mantra-sangraha/MuktikaUpanishad.pdf.. Retrieved 2008-04-26.
- Holdrege 1996, p. 7,426n
- Brooks, Douglas Renfrew, The Secret of the Three Cities: An Introduction to Hindu Shakta Tantrism, The University of Chicago Press (Chicago, 1990), pp. 13-14.
- Parts of this account are taken from the Introduction to Max Müller's The Upaniṣads, Part I.
- "…the prince was put to death by his brother Aurangzeb, in reality, no doubt, because he was the eldest son and legitimate successor of Shah Jehan, but under the pretext that he was an infidel, and dangerous to the established religion of the empire." Max Müller, The Upaniṣads, Part I, "Introduction," p. lvii.
- "How imbued is every line with firm, definite, and harmonious significance! From every page we come across profound, original, and sublime thoughts, whilst a lofty and sacred earnestness pervades the whole. … it is the most profitable and sublime reading that is possible in the world; it has been the consolation of my life and will be that of my death." Schopenhauer, Parerga and Paralipomena, Vol. II, § 182.
- In Chapter XVI, "Some Remarks on Sanskrit Literature."
- David Kalupahana, Causality: The Central Philosophy of Buddhism. The University Press of Hawaii, 1975, page 14.
- David Kalupahana, Causality: The Central Philosophy of Buddhism. The University Press of Hawaii, 1975, page 15.
- Paul Deussen, Philosophy of the Upanishads. tr. A.S. Geden (Edinburgh: T. & T. Clark, 1906, page 156, found in Kalupahana (1975).
- B.R. Ambedkar Philosophy of Hinduism, in "Dr Babasaheb Ambedkar Writings and Speeches, vol. 3", Government of Mahararasshtra, Bombay, 1987
- Edmonds, I.G. Hinduism. New York: Franklin Watts, 1979.
- Eknath Easwaran Upanishads, Nilgiri Press, 2007, ISBN 9781586380212
- Embree, Ainslie T., ed. The Hindu Tradition. New York: Random House, 1966.
- Holdrege, Barbara A. (1995), Veda and Torah, Albany: SUNY Press, ISBN 0791416399
- Merrett, Frances, ed. The Hindu World. London: MacDonald and Co, 1985.
- Pandit, Bansi. The Hindu Mind. Glen Ellyn, IL: B&V Enterprises, 1998.
- Radhakrishnan, S. (1994). The Principal Upanishads. New Delhi: HarperCollins Publishers India. ISBN 817223124-5 (original publication, 1953).
- Smith, Huston. The Illustrated World's Religions: A Guide to Our Wisdom Traditions. New York: Labyrinth Publishing, 1995.
- Wangu, Madhu Bazaz. Hinduism: World Religions. New York: Facts on File, 1991.
- Max Müller, translator, The Upaniṣads, Part I, New York: Dover Publications, Inc., 1962, ISBN 0-486-20992-X.
- Max Müller, translator, The Upaniṣads, Part II, New York: Dover Publications, Inc., 1962, ISBN 0-486-20993-8.
- Complete set of 108 Upanishads and other documents
- Upanishads at Sanskrit Documents Site
- Complete translation on-line into English of all 108 Upaniṣad-s
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