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*विशरणम् (नाशनम्) to destroy : They destroy the seeds of Avidya causing samsara in a Mumukshu (a sadhaka who wants to attain Moksha), hence this Vidya is called Upanishads.<blockquote>अविद्यादेः संसारबीजस्य विशरणाद् विनाशनादित्यनेन अर्थयोगेन विद्या उपनिषदुच्यते । avidyādeḥ saṁsārabījasya viśaraṇād vināśanādityanena arthayogena vidyā upaniṣaducyate ।</blockquote>

*विशरणम् (नाशनम्) to destroy : They destroy the seeds of Avidya causing samsara in a Mumukshu (a sadhaka who wants to attain Moksha), hence this Vidya is called Upanishads.<blockquote>अविद्यादेः संसारबीजस्य विशरणाद् विनाशनादित्यनेन अर्थयोगेन विद्या उपनिषदुच्यते । avidyādeḥ saṁsārabījasya viśaraṇād vināśanādityanena arthayogena vidyā upaniṣaducyate ।</blockquote>

*गतिः (प्रपणम् वा विद्यर्थकम्) to obtain or to know : That vidya which leads to  or make the sadhaka obtain Brahma, is called Upanishad.<blockquote>परं ब्रह्म वा गमयतोति ब्रह्म गमयितृत्वेन योगाद् विद्योपनिषद् । paraṁ brahma vā gamayatoti brahma gamayitr̥tvena yogād vidyopaniṣad ।</blockquote>

*गतिः (प्रपणम् वा विद्यर्थकम्) to obtain or to know : That vidya which leads to  or make the sadhaka obtain Brahma, is called Upanishad.<blockquote>परं ब्रह्म वा गमयतोति ब्रह्म गमयितृत्वेन योगाद् विद्योपनिषद् । paraṁ brahma vā gamayatoti brahma gamayitr̥tvena yogād vidyopaniṣad ।</blockquote>

*अवसादनम् (शिथिलर्थकम्) to loosen or to dissolve : Through which cycles of birth, aging etc painful process are loosened or dissolved (that is bondages of samsara are dissolved allowing the sadhaka to attain the Brahma).<blockquote>गर्भवासजन्मजराद्युपद्रववृन्दस्य लोकान्तरेपौनपुन्येन प्रवृत्तस्य अवसादपितृत्वेन उपनिषदित्युच्यते । garbhavāsajanmajarādyupadravavr̥ndasya lokāntarepaunapunyena pravr̥ttasya avasādapitr̥tvena upaniṣadityucyate ।</blockquote>His also defines the primary meaning of Upanishad as ब्रह्मविद्या (Brahmavidya। Knowledge of Brahma) and secondary meaning as ब्रह्मविद्याप्रतिपादकग्रन्थः (Brahmavidya pratipadaka granth । texts which  teach Brahmavidya). Shankaracharya's commentaries of the Kaṭha and Brihadaranyaka Upanishad also support this explanation.

*अवसादनम् (शिथिलर्थकम्) to loosen or to dissolve : Through which cycles of birth, aging etc painful process are loosened or dissolved (that is bondages of samsara are dissolved allowing the sadhaka to attain the Brahma).<blockquote>गर्भवासजन्मजराद्युपद्रववृन्दस्य लोकान्तरेपौनपुन्येन प्रवृत्तस्य अवसादपितृत्वेन उपनिषदित्युच्यते । garbhavāsajanmajarādyupadravavr̥ndasya lokāntarepaunapunyena pravr̥ttasya avasādapitr̥tvena upaniṣadityucyate ।</blockquote>His also defines the primary meaning of Upanishad as Brahmavidya (ब्रह्मविद्या । Knowledge of Brahma) and secondary meaning as ब्रह्मविद्याप्रतिपादकग्रन्थः (Brahmavidya pratipadaka granth । texts which  teach Brahmavidya). Shankaracharya's commentaries of the Kaṭha and Brihadaranyaka Upanishad also support this explanation.

An alternative explanation of the word Upanishad is "to sit near" derived as follows <ref name=":42222" /><ref name=":4" />

An alternative explanation of the word Upanishad is "to sit near" derived as follows <ref name=":42222" /><ref name=":4" />

Apart from these ten, कौषीतकि (Kaushitaki) श्वेताश्वतर (Shvetasvatara) and मैत्रायणीय (Maitrayaniya) Upanishads are regarded as ancient since the first two of these three found a mention by Shankaracharya in his Brahmasutra bhashyas along with dashopanishad bhashyas. However, there are no available commentaries on these given by him.

Apart from these ten, कौषीतकि (Kaushitaki) श्वेताश्वतर (Shvetasvatara) and मैत्रायणीय (Maitrayaniya) Upanishads are regarded as ancient since the first two of these three found a mention by Shankaracharya in his Brahmasutra bhashyas along with dashopanishad bhashyas. However, there are no available commentaries on these given by him.

===Upanishads as Part of Aranyakas===

===Upanishads as Part of Aranyakas===

Many Upanishads are the final or exclusive portions of the ''Aranyakas'' or the ''Brahmanas''. But these refer mainly to the dasha upanishads. It may be seen from the table below that some Upanishads not classified in dashopanishads are from Aranyakas. (Ex: Mahanarayaneeya Upanishad, Maitrayaniya Upanishad) while the Atharvana veda associated Upanishads do not have corresponding Brahmanas or Aranyakas as they are unavailable.

Many Upanishads are the final or exclusive portions of the Aranyakas or the Brahmanas. But these refer mainly to the dasha upanishads. It may be seen from the table below that some Upanishads not classified in dashopanishads are from Aranyakas. (Ex: Mahanarayaneeya Upanishad, Maitrayaniya Upanishad) while the Atharvana veda associated Upanishads do not have corresponding Brahmanas or Aranyakas as they are unavailable.

{| class="wikitable"

{| class="wikitable"

|+Upanishads as part of Aranyakas and Brahmanas

|+Upanishads as part of Aranyakas and Brahmanas

The authorship of most Upanishads is uncertain and unknown. The various philosophical theories in the early Upanishads have been attributed to famous seers such as Yajnavalkya, Uddalaka Aruni, Shvetaketu, Shandilya, Aitareya, Balaki, Pippalada and Sanatkumara.<ref name=":0">Mahadevan, T. M. P (1956), Sarvepalli Radhakrishnan, ed., History of Philosophy Eastern and Western, George Allen & Unwin Ltd</ref> Women, such as Maitreyi and Gargi participated in the dialogues and are also credited in the early Upanishads. Prasnopanishad is based on Prashna (questions) and Uttara (answer) format between gurus and shishyas, as such a number of rshis are mentioned in this Upanishad.  

The authorship of most Upanishads is uncertain and unknown. The various philosophical theories in the early Upanishads have been attributed to famous seers such as Yajnavalkya, Uddalaka Aruni, Shvetaketu, Shandilya, Aitareya, Balaki, Pippalada and Sanatkumara.<ref name=":0">Mahadevan, T. M. P (1956), Sarvepalli Radhakrishnan, ed., History of Philosophy Eastern and Western, George Allen & Unwin Ltd</ref> Women, such as Maitreyi and Gargi participated in the dialogues and are also credited in the early Upanishads. Prasnopanishad is based on Prashna (questions) and Uttara (answer) format between gurus and shishyas, as such a number of rshis are mentioned in this Upanishad.  

There are exceptions to the anonymous tradition of the Upanishads and other Vedic literature. The Shvetashvatara Upanishad, for example, includes closing credits to ''Shvetashvatara'', and he is considered the author of the Upanishad.

There are exceptions to the anonymous tradition of the Upanishads and other Vedic literature. The Shvetashvatara Upanishad, for example, includes credits to the seer Shvetashvatara in 6.21, and he is considered the author of the Upanishad.<ref name=":222">Swami Gambhirananda (2009 Fourth Edition) ''Svetasvara Upanishad With the Commentary of Sankaracharya.'' Kolkata: Advaita Ashrama (See Introduction)</ref>

 

Upanishads not only speak about evolution and manifestation of the world, as 'srsti', but also about its dissolution which make them a welcome support towards a better understanding of ancient discoveries. Inquiries into origin of the worldly things have been widely discussed. However, in such matters as above, one finds that  Upanishads abound in statements that are apparently contradictory in their nature.

 

Some describe the world to be real while others call it a illusion. One calls the Atman as essentially different from Brahman, while other texts describe the essential identity of the two. Some call Brahman the goal and the Atman the seeker, another draws an eternal verity of both. In between these extreme positions, there are varieties of other views. Yet all the divergent conceptions are based on the Upanishads. One must bear in mind that such views and perspectives have been traditionally existing from time immemorial in Bharatavarsha and the founders of these schools of thought are outstanding spokesmen of those systems. So is the case of the rshis and maharshis associated with the shad darshanas; they simply were their best expounders or codifiers.<ref name=":04">Swami Madhavananda author of A Bird's-Eye View of the Upanishads (1958) ''The Cultural Heritage of India, Volume 1 : The Early Phases (Prehistoric, Vedic and Upanishadic, Jaina and Buddhist).'' Calcutta : The Ramakrishna Mission Institute of Culture. (Pages 345-365)</ref>

 

Although everyone of these six systems of thought claims to derive its authority from the Upanishads, it is the Vedanta that bases itself wholly on them. In the Upanishads, the highest truths are given out as and when they were glimpsed by the rshis, hence may lack the systematic arrangement which can be expected of leisurely deliberation.<ref name=":04" />

 

The task of introducing order into Upanishad thoughts taken up by Badarayana, in the sutra format (Brahmasutras), failed to convey the exact meanings as intended by him. As a consequence the Brahmasutras also suffered the same fate as Upanishads with commentators interpreting them as per their predilections and training.

==विषयविभागम् ॥ Contents==

==विषयविभागम् ॥ Contents==

The main subject of Upanishads is the discussion about Paramatmatattva. There are two kinds of Vidyas : Para (पराविद्या) and Apara (अपराविद्या). Of these Paravidya is supreme and is called Brahmavidya (ब्रह्मविद्या). Upanishads present the detailed discussion about Paravidya. Aparavidya is primarily related to Karmas, hence called Karmavidya (कर्मविद्या). The fruits of Karmavidya are perishable while the results of Brahmavidya are indestructable. Aparavidya may not lead one to Moksha (may lead to svarga and other worlds) but Paravidya always gives Moksha.<ref name=":42222" />  

The main subject of Upanishads is the discussion about Paramatmatattva. There are two kinds of Vidyas : Para (पराविद्या) and Apara (अपराविद्या). Of these Paravidya is supreme and is called Brahmavidya (ब्रह्मविद्या). Upanishads present the detailed discussion about Paravidya. Aparavidya is primarily related to Karmas, hence called Karmavidya (कर्मविद्या). The fruits of Karmavidya are perishable while the results of Brahmavidya are indestructable. Aparavidya may not lead one to Moksha (may lead to svarga and other worlds) but Paravidya always gives Moksha.<ref name=":42222" />