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Brahmatattva (Samskrit : ब्रह्मतत्वम्) deals with the nature of [[Brahman (ब्रह्मन्)|Brahman]], understanding which forms the central idea of Upanishad teachings. Some of the brilliant gems of human thought processes are found crystallized in the Upanishads and such texts. They treat not of secular knowledge, which any science can teach, but of Brahmavidya, the knowledge of Brahman, the ultimate Reality of the Universe.

In this article, a few important directly relevant parts of the various Upanishads are presented along with the context. Since the subject matter of Vedanta is vast, exhaustive discussions are not attempted.  

== परिचयः ॥ Introduction ==
Discussion of Brahman-Atman and Jnana develops in the Upanishads as the means to drawn the mind of a man inwards towards the mysteries of the Universe and ultimate goal of man - [[Moksha (मोक्षः)|Moksha]] or Mukti (loosely translated but not equal to liberation, freedom in this life or after-life). Worship which was primarily of the nature and natural elements (like fire, clouds and rains, air) in the Vedas was followed by worship of deities having a form and qualities (Saguna Brahma). Brahman in Vedanta and Upanishads is, however, both personal (Saguna) with form and name and impersonal (Nirguna) addressed as "Tat (तत्)" (That) which is a nameless, formless Supreme Entity without attributes and qualities. 
==एकं सत् ॥ The One Existence==
While the Vedic texts explicitly discuss about the worship of the nature and devatas such as the ''Agni'', ''Aditya'', ''Indra'', ''Rudra'', ''Visnu'', ''Brahma'' in the early yugas (starting with Krta yuga of different Kalpas) we may note that in the Upanishads there is a mention of meditation on the supreme, immortal and formless Brahman-Atman. The many names of devatas with forms and weapons gradually merged into defining a One Existence, a supreme being called  as Brahman etc.<blockquote>एकं सद्विप्रा बहुधा वदन्ति । ekaṁ sadviprā bahudhā vadanti । (Rig. Veda. 1.164.46)<ref>Rig Veda ([http://vedicheritage.gov.in/samhitas/rigveda/shakala-samhita/rigveda-shakala-samhitas-mandal-01-sukta-164/ Mandala 1 Sukta 164])</ref></blockquote>Devatas who held positions in the outer worlds are declared to be everywhere, even as the innermost being of each human being and within every other living creature.<blockquote>एकमेवाद्वितीयम्। ekamevādvitīyam। (Chand. Upan. 6.2.1)<ref>Chandogya Upanishad ([https://sa.wikisource.org/wiki/%E0%A4%9B%E0%A4%BE%E0%A4%A8%E0%A5%8D%E0%A4%A6%E0%A5%8B%E0%A4%97%E0%A5%8D%E0%A4%AF%E0%A5%8B%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A6%E0%A5%8D/%E0%A4%85%E0%A4%A7%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AF%E0%A4%83_%E0%A5%AC Adhyaya 6])</ref></blockquote>What was One reality or ''ekam'' sat of the Vedas now transformed to the ekam eva advitiyam brahma'' or "the one and'' ''only one, sans a second''" in the Upanishads.<ref name=":0222" /> 
== Two Aspects of Brahman ==
In the Vedantic literature the Brahman is often spoken of as Saguna Brahman and Nirguna Brahman. That is, the same Brahman is viewed from two different standpoints--the relative standpoint and the independent standpoint. Brahman of the Upanishads is both personal and impersonal (Saguna and Nirguna). Vedantasara defines Brahman as four types as given in Shabdakalpadruma.
: ब्रह्म चतुर्व्विधं यथा । विराट् १ हिरण्यगर्भः २ ईश्वरः ३ तुरीयः ४ । इति वेदान्तसारः ॥
Isvara is like a supreme devata in relation to the universe and viewed through human perspective, whereas Brahman is Supreme or Absolute, as He is in Himself, viewed independently.<ref name=":0">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>

Saguna Brahma having form and other attributes is termed as
*हिरण्यगर्भः ॥ Hiranyagarbha as in Rig Veda (10.82)
*विराट् पुरुषः ॥ Virat Purusha as in Aitareya Upanishad 1.1.4
*ईश्वरः ॥ Ishvara as in Isavasyopanishad
*सर्वेश्वरः ॥ Sarveshvara in Mandukya Upanishad 6
*तुरीयः ॥ Turiya as in Mandukya Upanishad 7
*नारायणः ॥ Narayana as in Bhagavata Purana
Nirguna Brahma devoid of all attributes is termed as
*त्तत् ॥ Tat as in Chandogya Upanishad (6.8.7) Katha (2.1.3)
*चैतन्यमात्रम् ॥ Chaitanyamatra and Prajnanaghana (प्रज्ञानघन) as in Shankara Bhashya for Brahma Sutras (3.2.16)
*पुरुषः ॥ Purusha as in Mundaka Upanishad (2.1.2)
*ब्रह्मन् ॥ Brahman (Atman) as in Brhdaranyaka (1.4.10) and Chandogya (3.14.1)
*अक्षरं ॥ Aksharam as in Brhdaranyaka (3.8.8) and Mundakopanishad (1.1.5)

=== सगुणब्रह्मा ॥ Saguna Brahma ===
Mandukya Upanishad is typically studied in the context of explaining the concept of a supreme personal aspect of Brahman. According to this concept, Brahman is the ruler of the universe. He projects it, maintains it and dissolves it at the end. He guides the destinies of the multitudinous beings that dwell in it. He monitors the award the good according to their merits (पुण्यम्), leading them to prosperity and ultimately in the path of ascent to higher lokas. He keeps a watch over the misdeeds (पापम्) of the beings and oversees their reformation; thus the "being" is lead into the karmic cycle of punarjanma. He is termed Ishvara, whose body is the sum-total of all bodies in the Universe (Virat), and whose mind is the aggregate of all minds (Hiranyagarbha). Through all hands He works, through all feet He walks, through all eyes He sees, through all ears He hears.<ref name=":0" /> Here it may be noted that Ishvara is addressed as He (with a capital H ), a personified form having attributes of a living being.  <blockquote>एष सर्वेश्वर एष सर्वज्ञ एषोऽन्तर्याम्येष योनिः सर्वस्य प्रभवाप्ययौ हि भूतानाम् ॥ ६ ॥ (Mand. Upan. 6)<ref name=":4">Mandukya Upanishad ([https://sa.wikisource.org/wiki/%E0%A4%AE%E0%A4%BE%E0%A4%A3%E0%A5%8D%E0%A4%A1%E0%A5%81%E0%A4%95%E0%A5%8D%E0%A4%AF%E0%A5%8B%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A6%E0%A5%8D Complete])</ref></blockquote><blockquote>eṣa sarveśvara eṣa sarvajña eṣo'ntaryāmyeṣa yoniḥ sarvasya prabhavāpyayau hi bhūtānām ॥ 6 ॥</blockquote>Summary : This one is the Ishvara (Shasaka, Paripalaka, Ruler) of all (सर्वेश्वरः);  is all-knowing (सर्वज्ञः । omniscient); is inner director all (अन्तर्यामि । inner controller or director); is the Source of all  beings (योनिः सर्वस्य); and is verily the place of Origin and Dissolution of all beings (प्रभवाप्ययौ हि भूतानाम्).


In this Upanishad a start was made with the premise that the Self (Ishvara) is possessed of four quarters. After the description of the three quarters (or states namely Visva, Taijasa and Prajna), the following lines point to that fourth quarter (Turiya) which is significantly different from the other three states<blockquote>नान्तःप्रज्ञं न बहिष्प्रज्ञं नोभयतःप्रज्ञं न प्रज्ञानघनं न प्रज्ञं नाप्रज्ञम् । अदृष्टमव्यवहार्यमग्राह्यमलक्षणं अचिन्त्यमव्यपदेश्यमेकात्मप्रत्ययासारं प्रपञ्चोपशमं शान्तं शिवमद्वैतं चतुर्थं मन्यन्ते स आत्मा स विज्ञेयः ॥ ७ ॥ (Mand. Upan. 7)<ref name=":4" /></blockquote><blockquote>nāntaḥprajñaṁ na bahiṣprajñaṁ nobhayataḥprajñaṁ na prajñānaghanaṁ na prajñaṁ nāprajñam । adr̥ṣṭamavyavahāryamagrāhyamalakṣaṇaṁ acintyamavyapadeśyamekātmapratyayāsāraṁ prapañcopaśamaṁ śāntaṁ śivamadvaitaṁ caturthaṁ manyante sa ātmā sa vijñeyaḥ ॥ 7 ॥ (Mand. Upan. 7)</blockquote>Summary : They consider the Fourth to be that which is not conscious of the internal world (न अन्तःप्रज्ञं), nor conscious of the external world (न बहिष्प्रज्ञं) nor conscious of both the worlds (न उभयतःप्रज्ञं), nor a mass of consciousness (प्रज्ञानघनं), nor simple consciousness (न प्रज्ञं), nor unconsciousness (न अप्रज्ञम्); it is unseen or unperceived (अदृष्टम् । not an object of any sense of knowledge) therefore Avyavaharyam (अव्यवहार्यम्) beyond empirical dealings; Agrahyam (अग्राह्यम्) beyond the grasp, of organs of action; Alakshanam (अलक्षणं) without any logical ground of inference, thus uninferrable. Therefore, It is Achintyam (अचिन्त्यम्) unthinkable hence It is Avyapadesyam (अव्यपदेश्यम्) indescribable by words. Its (Turiya state's) Sara (सारं) or valid proof is ekatmapratyaya (एकात्मप्रत्यया), the unchanging sole belief in the Self; Prapanchopasamam (प्रपञ्चोपशमं) the one in whom all phenomena have ceased, hence Shantam (शान्तं), unchanging (free from emotions) and Shivam (शिवम्) auspicious. Chaturtham (the fourth state called Turiya) is thus considered (to be distinct from the other three states) as that Atma (स आत्मा), that is to be known (स विज्ञेयः).<ref name=":32">Swami Gambhirananda (1937) ''Eight Upanishads, Volume 2 (Aitareya, Mundaka, Mandukya and Karika, and  Prasna) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama. (Pages 205-211)</ref> That Atman (Self) (referring to the Absolute Brahman) is denoted by the syllable Om<blockquote>सोऽयमात्माध्यक्षरमोङ्करोऽधिमात्रं... so'yamātmādhyakṣaramoṅkaro'dhimātraṁ... (Mand. Upan. 8)<ref name=":4" /></blockquote>

===निर्गुणब्रह्मा ॥ Nirguna Brahma===
As explained above, beyond the name and form Brahman, there exists the concept of impersonal Brahman, devoid of all attributes but is the material, efficient, formal and final cause of all that exists. The eternal witness, 'the ear of the ear, the mind of the mind, eye of the eye etc' as explained by the Kenopanishad.

The Unmanifest nature of Brahman is expressed in two ways
* Brahman is Sat-Chit-Ananda which means the Existence Absolute, Knowledge Absolute and Bliss Absolute.
* Brahman is Satyam - Jnanam - Anantam
It is the pervasive, genderless, infinite, eternal truth and bliss which does not change, yet is the cause of all changes. Brahman is "the infinite source, fabric, core and destiny of all existence, both manifested and unmanifested, the formless infinite substratum and from which the universe has manifested. Brahmasutras assert the unmanifest nature of Brahman.<blockquote>तदव्यक्तमाह हि । tadavyaktamāha hi । (Brah. Sutra. 3.2.23)</blockquote>That Brahman is unmanifest, for the Upanishad says so.<ref>Swami Gambhirananda. (1956) ''Brahma-Sutra-Bhashya of Sri Sankaracarya.'' Almora : Advaita Ashrama (Pages 628)</ref>

Attributeless, formless and nameless be the description of Nirguna Brahma, however, his nature is Infiniteness, Absoluteness, Eternity, and Changelessness finally it constitutes All That Is (अस्तीति). That which is beyond number and name is denoted by one sound called [[Pranava (प्रणवः)]].<ref name=":0222">''Sanatana Dharma : An Advanced Textbook of Hindu Religion and Ethics''. (1903) Benares : The Board of Trustees, Central Hindu College</ref>

== What is Brahman? ==
According to various Vedic sources, Brahman has been defined with different perspectives.

====Brhdaranyaka Upanishad====
Brhdaranyaka Upanishad, a treasure trove for the sadhakas engaged in understanding Brahman, is a voluminous text. A few selected parts of it are presented here for summarizing the Brahmatattva.<blockquote>तदेतद्ब्रह्मापूर्वमनपरमनन्तरमबाह्यम् । अयमात्मा ब्रह्म सर्वानुभूः । इत्यनुशासनम् ॥ बृह. २,५.१९ ॥ (Brha. Upan. 2.5.19)<ref>Brhadaranyaka Upanishad ([https://sa.wikisource.org/wiki/%E0%A4%AC%E0%A5%83%E0%A4%B9%E0%A4%A6%E0%A4%BE%E0%A4%B0%E0%A4%A3%E0%A5%8D%E0%A4%AF%E0%A4%95_%E0%A4%89%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A6%E0%A5%8D_2p Adhyaya 2 Brahmana 5])</ref></blockquote><blockquote>tadetadbrahmāpūrvamanaparamanantaramabāhyam । ayamātmā brahma sarvānubhūḥ । ityanuśāsanam ॥ br̥ha. 2,5.19 ॥</blockquote>That Brahman is without prior or posterior, without interior or exterior. This Self, the perceiver of everything is the Brahman. This is the teaching.<ref>Swami Madhavananda (1950 Third Edition) ''The Brhadaranyaka Upanishad with the commentary of Sankaracharya.'' Almora: Advaita Ashram. (Pages 402 and 403)</ref> 

This Self is Brahman' is one of the most important characteristic in the above mantra. 


In the Yajnavalkya Gargi Samvada, one finds a very comprehensive synopsis about Brahmatattva being attributeless<blockquote>स होवाच एतद्वै तदक्षरं गार्गि ब्राह्मणा अभिवदन्ति, अस्थूलमनण्व-ह्रस्वमदीर्घ-मलोहितमस्नेह-मच्छायमतमोऽवाय्वनाकाश-मसङ्गमरस-मगन्ध-मचक्षुष्क-मश्रोत्र-मवागमनोऽतेजस्क-मप्राण-ममुख-मगात्रमनन्तरमबाह्यम् न तदश्नाति किंचन । न तदश्नाति कश्चन ॥ बृह. ३,८.८ ॥ (Brha. Upan. 3.8.8)<ref name=":8">Brhdaranyaka Upanishad ([https://sa.wikisource.org/wiki/%E0%A4%AC%E0%A5%83%E0%A4%B9%E0%A4%A6%E0%A4%BE%E0%A4%B0%E0%A4%A3%E0%A5%8D%E0%A4%AF%E0%A4%95_%E0%A4%89%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A6%E0%A5%8D_3p Adhyaya 3 Brahmana 8])</ref></blockquote><blockquote>sa hovāca etadvai tadakṣaraṁ gārgi brāhmaṇā abhivadanti, asthūlamanaṇva-hrasvamadīrgha-malohitamasneha-macchāyamatamo'vāyvanākāśa-masaṅgamarasa-magandha-macakṣuṣka-maśrotra-mavāgamano'tejaska-maprāṇa-mamukha-magātramanantaramabāhyam na tadaśnāti kiṁcana । na tadaśnāti kaścana ॥ br̥ha. 3,8.8 ॥ (Brha. Upan. 3.8.8)</blockquote>Meaning : O Gargi!, the knowers of Brahman say, this Immutable Aksharam (Brahman) is that - it is neither gross (अस्थूलम्) nor minute (अनण्वः), neither short (अह्रस्वः) nor long (अदीर्घः), neither red in color (अलोहितः) nor viscous/oily (अस्नेहः), neither shadow (अच्छायः) nor darkness (अतमः), neither air (अवायुः) nor ether (अनाकाशः), unattached (असङ्गम्), neither of any taste (अरसम्) or odour (अगन्धः), without eyes (अचक्षुष्कः) or ears (अश्रोत्रः), without the speech organ (अवाक्) or the mind (अमनः), non effulgent (अतेजस्कः), without the vital force (अप्राणः) or the mouth (अमुखम् or face), without a carnal body (अगात्रम्), and without interior (अनन्तरम्) or exterior (अबाह्यम्). It does not eat anything, nor is IT eaten by anybody.<ref name=":9">Swami Madhavananda (1950 Third Edition) ''The Brhadaranyaka Upanishad with the commentary of Sankaracharya.'' Almora: Advaita Ashram. (Page 517)</ref>

By the fourfold negation of size (gross, minute, short, and long) all the characteristics of a substance are denied of IT, thus Brahman is not a substance (द्रव्यम्). Owing to lack of qualities such as red color, viscosity, oiliness etc Brahman does not have any qualities (गुणाः). Without any sense organs or the mind, it lacks any lustre, is immeasurable, devoid of Prana or the vital force.

That Brahman is indeed unconditioned and described as Pure Intelligence is seen in the [[Yajnavalkya Maitreyi samvada (याज्ञवल्क्यमैत्रेय्योः संवादः)|Yajnavalkya Maitreyi Samvada]] of this text in the following lines<blockquote>स यथा सैन्धवघनोऽनन्तरोऽबाह्यः कृत्स्नो रसघन एव । एवं वा अरेऽयमात्मानन्तरोऽबाह्यः कृत्स्नः प्रज्ञानघन एव । एतेभ्यो भूतेभ्यः समुत्थाय तान्येवानुविनयति । न प्रेत्य संज्ञास्तीत्यरे ब्रवीमि । इति होवाच याज्ञवल्क्यः ॥ बृह. ४,५.१३ ॥ (Brha. Upan. 4.5.13)<ref>Brhdaranyaka Upanishad ([https://sa.wikisource.org/wiki/%E0%A4%AC%E0%A5%83%E0%A4%B9%E0%A4%A6%E0%A4%BE%E0%A4%B0%E0%A4%A3%E0%A5%8D%E0%A4%AF%E0%A4%95_%E0%A4%89%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A6%E0%A5%8D_4p Adhyaya 4 Brahmana 5])</ref></blockquote>Summary : As a lump of salt is without interior or exterior, entire and purely saline in taste, so also the Self is without interior or exterior, entire and pure Intelligence alone. Formerly it possessed particular consciousness owing to the particular combinations with the elements. When that particular consciousness and its cause, have been dissolved (just like the lump of salt in water) it attains oneness destroying all the separateness. This is what Yajnavalkya says.<ref>Swami Madhavananda (1950 Third Edition) ''The Brhadaranyaka Upanishad with the commentary of Sankaracharya.'' Almora: Advaita Ashram. (Pages 780-781)</ref>
====Mundakopanishad====
Mundaka Upanishad describes the Brahman as [[Purusha (पुरुषः)|Purusha]], the Immutable apart from the other (Saguna Brahma) immutable which is the seed of name and form. This absolute Immutable that is devoid of all limiting adjuncts, which is the very essence of the (other) immutable, is comparable to space, free of all forms and is describable by expressions such as "Neti Neti (नेति नेति । Not this, Not this).<ref name=":5">Swami Gambhirananda (1937) ''Eight Upanishads, Volume 2 (Aitareya, Mundaka, Mandukya and Karika, and  Prasna) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama. (Pages 115-117)</ref><blockquote>दिव्यो ह्यमूर्तः पुरुषः स बाह्याभ्यन्तरो ह्यजः । अप्राणो ह्यमनाः शुभ्रो ह्यक्षरात् परतः परः ॥ २ ॥ (Mund. Upan. 2.1.2)<ref name=":6">Mundaka Upanishad ([https://sa.wikisource.org/wiki/%E0%A4%AE%E0%A5%81%E0%A4%A3%E0%A5%8D%E0%A4%A1%E0%A4%95%E0%A5%8B%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A6%E0%A5%8D See Mundaka 2 Khanda 1])</ref></blockquote><blockquote>divyo hyamūrtaḥ puruṣaḥ sa bāhyābhyantaro hyajaḥ । aprāṇo hyamanāḥ śubhro hyakṣarāt parataḥ paraḥ ॥ 2 ॥ (Mund. Upan. 2.1.2)</blockquote>Summary : Purusha is transcendental because of effulgence due to Self (दिव्यः), since He is devoid of any form (अमूर्तः). That Purusha is all-pervasive or coextensive in all that is both external and internal (sa bahyabhyantara । स बाह्याभ्यन्तरः); birthless (अजः), therefore without vital force (अप्राणः) and without mind (अमनाः). (with these two limiting adjuncts absent) It is pure (शुभ्रः), and higher than the other immutable called the Akshara (here it pertains to Maya). This means that the unconditioned, all-pervasive entity is Parah (परः), higher; अक्षरात् परतः - than that immutable (Maya) that is superior (in relation to all other modifications).<ref name=":5" />
====Kathopanishad====
Yama Nachiketa Samvada reveals the secrets of death and to avoid the jaws of death Yama describes Brahmatattva as follows<blockquote>अशब्दमस्पर्शमरूपमव्ययं तथाऽरसं नित्यमगन्धवच्च यत् । अनाद्यनन्तं महतः परं ध्रुवं निचाय्य तन्मृत्युमुखात् प्रमुच्यते ॥ १५ ॥ (Kath. Upan. 1.3.15)<ref name=":2">Kathopanishad ([https://sa.wikisource.org/wiki/%E0%A4%95%E0%A4%A0%E0%A5%8B%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A6%E0%A4%A4%E0%A5%8D/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%A5%E0%A4%AE%E0%A5%8B%E0%A4%A7%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AF%E0%A4%83/%E0%A4%A4%E0%A5%83%E0%A4 Adhyaya 1 Valli 3])</ref></blockquote><blockquote>aśabdamasparśamarūpamavyayaṁ tathā'rasaṁ nityamagandhavacca yat । anādyanantaṁ mahataḥ paraṁ dhruvaṁ nicāyya tanmr̥tyumukhāt pramucyate ॥ 15 ॥ (Kath. Upan. 1.3.15)</blockquote>Summary : One becomes freed from the jaws of death by knowing That which is soundless (अशब्दम्), touchless (अस्पर्शम्), formless (अरूपम्), undiminishing (अव्ययम्), and also tasteless (अरसम्), eternal (नित्यम्), odourless (अगन्धवत्), without beginning or end (अनाद्यनन्तं), distinct from Mahat (महतः परं), and ever constant (ध्रुवं).<ref name=":3">Swami Gambhirananda (1989 Second Edition) ''Eight Upanishads, Volume 1 (Isa, Kena, Katha,and Taittriya) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama</ref>

Here again the characteristics of a substance are denied and the eternity of Brahman is proved (Avyayam, Anadi, Anantam etc). It is distinct in nature from the principle Mahat, called buddhi or intelligence for it is the witness of all, being eternal Consciousness and It is Brahman, being the Self of all beings. It has been mentioned that<blockquote>एष सर्वेषु भूतेषु गूढोऽऽत्मा न प्रकाशते । eṣa sarveṣu bhūteṣu gūḍho<nowiki>''</nowiki>tmā na prakāśate । (Kath. Upan. 1.3.12)<ref name=":2" /></blockquote>He is hidden in all beings, and hence does not appear as the Atman (of all).
====Chandogya Upanishad====
Chandogya mentions that the nature Brahman is that of a bearer, a container (adhistata). Akasha is the manifestor of name and form and That inside which these two lie is Brahman ; which is Immortal.<ref name=":7">Mm. Ganganatha Jha, (1942) ''The Chandogyopanishad with the commentary of Sankara. Poona'' : Oriental Book Agency (Page No 486)</ref><blockquote>आकाशो वै नाम नामरूपयोर्निर्वहिता ते यदन्तरा तद्ब्रह्म तदमृतँ । ākāśo vai nāma nāmarūpayornirvahitā te yadantarā tadbrahma tadamr̥tam̐ ।(Chan. Upan. 8.14.1)<ref>Chandogya Upanishad ([https://sa.wikisource.org/wiki/%E0%A4%9B%E0%A4%BE%E0%A4%A8%E0%A5%8D%E0%A4%A6%E0%A5%8B%E0%A4%97%E0%A5%8D%E0%A4%AF%E0%A5%8B%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A6%E0%A5%8D/%E0%A4%85%E0%A4%A7%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AF%E0%A4%83_%E0%A5%AE Adhyaya 8] See Khanda 14)</ref></blockquote>That the Brahman is the basis of the whole universe (Adhishtata) is emphasized in the Taittriya Upanishad also.
====Brahma Sutras====
While it is well known that Brahman is Pure Consciousness, Shankaracharya uses the term Prajnana-ghana । प्रज्ञानघन for explaining It as seen in his bhashya.

Brahma sutra : आह च तन्मात्रम् । ( ब्रसू-३,२.१६) āha ca tanmātram ।(Brah. Sutr. 3.2.16)

Shankara Bhasyam:<blockquote>आह च श्रुतिः चैतन्यमात्रं विलक्षणरूपान्तररहितं निर्विशेषं ब्रह्म स यथा सैन्धवघनोऽनन्तरोऽबाह्यः कृत्स्नो रसघन एवैवं वा अरेऽयमात्मानन्तरोऽबाह्यः कृत्स्नः प्रज्ञानघन एव इति।</blockquote><blockquote>āha ca śrutiḥ caitanyamātraṁ vilakṣaṇarūpāntararahitaṁ nirviśeṣaṁ brahma sa yathā saindhavaghano'nantaro'bāhyaḥ kr̥tsno rasaghana evaivaṁ vā are'yamātmānantaro'bāhyaḥ kr̥tsnaḥ prajñānaghana eva iti।</blockquote>The Upanishad also declares that Brahman is pure consciousness  (चैतन्यमात्रं) devoid of other aspects contrary to this (विलक्षणरूपान्तररहितं), and without any distinguishing feature (निर्विशेषं). This means that the Self has no internal or external aspect apart from Pure Consciousness. Its nature is mere impartible consciousness without intervening intervals.<ref>Swami Gambhirananda. (1956) ''Brahma-Sutra-Bhashya of Sri Sankaracarya.'' Almora : Advaita Ashrama (Pages 613-614)</ref> The Upanishad referred to here is the Brhdaranyaka Upanishad (4.5.13).

== Three Aspects of Brahman ==
Shvetashvatara Upanishad describes three aspects of Brahman<blockquote>ज्ञाज्ञौ द्वावजावीशनीशावजा ह्येका भोक्तृभोग्यार्थयुक्ता ।अनन्तश्चात्मा विश्वरूपो ह्यकर्ता त्रयं यदा विन्दते ब्रह्ममेतत् ॥ ९ ॥ (Shve. Upan. 1.9)</blockquote><blockquote>jñājñau dvāvajāvīśanīśāvajā hyekā bhoktr̥bhogyārthayuktā ।anantaścātmā viśvarūpo hyakartā trayaṁ yadā vindate brahmametat ॥ 9 ॥</blockquote>They two, (Isha, the internal ruler and Anisha, the ruled) are both birthless and are all-knowing (jna) and ignorant (ajna), almighty and powerless respectively. The birthless one,भोक्तृभोग्यार्थयुक्ता (Maya) is employed for bringing into being the enjoyer, the enjoyable and the enjoyment. The Self is infinite since It has the universe as Its appearance; It is not an agent (Akarta). One who realizes the three (Isha, Anisha and Bhoktrubhogyarthayukta) as Brahman becomes free.<ref name=":22">Swami Gambhirananda (2009 Fourth Edition) ''Svetasvara Upanishad With the Commentary of Sankaracharya.'' Kolkata: Advaita Ashrama (Pages 80-94)</ref><blockquote>भोक्ता भोग्यं प्रेरितारं च मत्वा सर्वं प्रोक्तं त्रिविधं ब्रह्ममेतत् ॥ १२ ॥ bhoktā bhogyaṁ preritāraṁ ca matvā sarvaṁ proktaṁ trividhaṁ brahmametat ॥ 12 ॥ (Shve. Upan. 1.12)<ref name=":10">Shvetashvatara Upanishad ([https://sa.wikisource.org/wiki/%E0%A4%B6%E0%A5%8D%E0%A4%B5%E0%A5%87%E0%A4%A4%E0%A4%BE%E0%A4%B6%E0%A5%8D%E0%A4%B5%E0%A4%A4%E0%A4%B0%E0%A5%8B%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A4%E0%A5%8D/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%A5%E0%A4%AE%E0%A4%83_%E0%A4 Adhyaya 1])</ref></blockquote>Bhokta (भोक्ता । the enjoyer) the individual Atma, Bhogyam (भोग्यं । the things of enjoyment) and Preritaram (प्रेरितारं । the Supreme force) - are said to be the three aspects of Brahman.

In the commentary of the above lines, jna, ajna and Bhoktrubhogyarthayukta are equated to Iswara, jiva and prakriti (i.e. Maya).<ref name=":22" />

== Causal Nature of Brahman ==
Creation involves four aspects: 
# visualization of, thinking of, deliberation on things involved in creation (intelligent or efficient cause)
# material that undergoes change during creation (example is clay is the material used to make a pot) (material cause)
# execution of action of creation (act of creating a pot from mud) (Is it Maya, Ishvara, or Brahman who control creation?)
# process of actual transformation of material into a thing (examples : pot is made from mud involves change in form, forming of curds from milk involves change in composition)
The question of how Brahman is related to the visible world and whether he is the intelligent or efficient cause (nimitta karana), material cause (upadana karana) or acts as the substratum (Adhishtana) leads one to explore the [[Upanishads (उपनिषदः)|Upanishads]]. Here we put together a few perspectives for exploring the role of Brahman in relation to the Universe as follows
#Is Brahman, the nimitta (निमित्तम् । efficient) cause for the Universe?
#Is Brahman, the upadana (उपादानम् । material) cause for the Universe? 
#Is the transformation process real by Parinama (परिणामम् । transformation just like milk becoming curd as described by Samkhya siddhanta) or Vivarta (विवर्त । unreal or apparent change)?
#Is Brahman, the adhistanam (अधिष्ठानम् । substratum) for the Universe?
In this section, we touch upon the different texts that advocate each or combinations of the above mentioned perspectives. Different Sampradayas have postulated their versions about this aspect based on their interpretations of the texts and hence we find various associated karana-vadas (arguments about cause).

=== उपादान-कारणत्वम् ॥ Upadana Karana ===
The following texts discuss the arguments as to why Brahman is not actual creator of the Universe. A cause has to undergo change to become the effect, after which It  (material that was the cause) ceases to exist, therefore texts saying Brahman is Aksharam (immutable) and Amrtam (eternal) portrays that Brahman does not undergo any material change.
#Shvetasvatara Upanishad (1.7 and many other references) proclaims Brahman to be distinct and that it is an excellent immutable support for the creation.<ref>Swami Gambhirananda (2009 Fourth Edition) ''Svetasvara Upanishad With the Commentary of Sankaracharya.'' Kolkata: Advaita Ashrama (Page 70)</ref>
#Brhdaranyaka Upanishad (2.5.19) states Brahman is without prior or posterior, without interior or exterior. This Self, the perceiver of everything, is Brahman.<ref name=":1">Swami Gambhirananda (2009 Fourth Edition) ''Svetasvara Upanishad With the Commentary of Sankaracharya.'' Kolkata: Advaita Ashrama (Page 37)</ref>
#Brhdaranyaka Upanishad (3.8.8) state that Brahman is neither gross nor minute, neither short nor long.<ref name=":1" />
#Chandogya Upanishad (8.14.1) clarify that Brahman is the substratum. That which is indeed Akasha is the manifestor of Name and Form. That in which they are contained is Brahman and it is Immortal.<ref name=":7" />
#Kathopanishad (1.2.18) states that Brahman which has Om as its medium, is neither born nor does it die. It did not originate from anything nor did anything originate from it. It is birthless, eternal, undecaying and ancient. It is not affected even when the body is killed.<ref name=":11">Swami Gambhirananda (1989 Second Edition) ''Eight Upanishads, Volume 1 (Isa, Kena, Katha,and Taittriya) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama (Page 143)</ref>
#Kathopanishad (1.3.15) further elaborates the nature of Brahman that It is soundless, touchless, colourless and undiminishing, tasteless, eternal, odourless, without a beginning or an end.<ref>Swami Gambhirananda (1989 Second Edition) ''Eight Upanishads, Volume 1 (Isa, Kena, Katha,and Taittriya) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama (Pages 166-167)</ref>
#Mundakopanishad (1.1.5-7, 2.1.2<ref name=":6" /> and other references) talk about Brahman being all-pervasive, anadi (without beginning), It is Ajah (birthless), nityam (eternal), extremely subtle and indestructible (aksharam).<ref>Swami Gambhirananda (1937) ''Eight Upanishads, Volume 2 (Aitareya, Mundaka, Mandukya and Karika, and  Prasna) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama. (Page 89-90)</ref>
#Ishavasyopanishad (7-8) emphasizes on the unity (of Brahman and Atman) describing the nature of Brahman as all-pervasive (paryagaat), pure, bodiless (akayam) thus negating the causal body.<ref>Swami Gambhirananda (1989 Second Edition) ''Eight Upanishads, Volume 1 (Isa, Kena, Katha,and Taittriya) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama (Pages 13-14)</ref>
#Prashnopanishad (4.10) refers to the indestructible entity (aksaram) as shadowless, bodiless (ashariram), colourless and pure.<ref>Swami Gambhirananda (1937) ''Eight Upanishads, Volume 2 (Aitareya, Mundaka, Mandukya and Karika, and Prasna) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama. (Page 466-467)</ref>
One can narrow down to the following three points from the above texts as Advaita vedantins argue that Brahman cannot be the upadana karana for Jagat 
* Brahman is all-pervasive, so there cannot be any effect in which It is not present
* Brahman is One, thus as there can be no second entity the question of effect does not come into place
* Brahman is Immutable, changeless, thus it does not undergo any change
Perspectives given by other sampradayas are discussed separately.

=== निमित्त-कारणत्वम् ॥ Nimitta Karana ===
As explained in the beginning of this section about the factors involved in creation, here we deal with Brahman being or not being the nimitta karana or intelligent cause for Universe. The concept of creation involves another perspective of thinking and deliberation behind the material transformation of the universe. Upanishad mantras portraying the qualities of inaction, without mind (amanah) and bodilessness are referred to show that Brahman cannot be the nimitta karana (intelligent cause) for the origin of universe.
# Brhadaranyaka Upanishad (3.8.8)<ref name=":8" /> is an important reference which describes Brahman (Aksharam) as neither gross nor minute, neither short nor long, without bodily attributes, without the mind (amana) or the vital force (aprana) depicts the incapability of Brahman to be the intelligent cause of universe.<ref name=":9" />
# Shvetashvatara Upanishad (1.9)<ref name=":10" /> mentions the lack of bodily attributes in Brahman yet mentions that Brahman is all-knowing.
# Shvetashvatara Upanishad (6.8) again mentions that Brahman has neither body (karyam) nor the organs (karanam)<ref>Swami Gambhirananda (2009 Fourth Edition) ''Svetasvara Upanishad With the Commentary of Sankaracharya.'' Kolkata: Advaita Ashrama (Page 188)</ref>
# Mundakopanishad (2.1.2)<ref name=":6" /> is referred here again as it reiterates that Brahman has neither a mind nor the vital force to exercise its intelligence.
# Kathopanishad (1.2.18) is referred here again as it states that Brahman is not affected even when the body is killed, while Kathopanishad (1.2.19)<ref name=":11" /> mentions that It does not kill nor is it killed. Thus here the bodily attributes are negated again.
However, there are other textual references which point out that Brahman is endowed with intelligent faculties, He visualized, thought and deliberated on the process of Srshti and thus arose the concept of Manyness from One entity.
# Chandogya Upanishad (6.2.3) mentions that It (the Being) conceived - May I become Many; May I grow forth and It created Fire. The Bhashya explains that the Being is sentient and only a sentient Being can conceive as against the Pradhana, of Samkhya siddhanta, which is regarded as insentient.<ref>Mm. Ganganatha Jha, (1942) ''The Chandogyopanishad with the commentary of Sankara. Poona'' : Oriental Book Agency (Page No 304-305)</ref>
# Aitareya Upanishad (1.1.1-4) in the first few mantras mentions that the Atman thought (ईक्षते । Ikshata) "Let me create the worlds". Having deliberated, as an intelligent architect, He created these worlds, Ambhas (अम्भस्), marici (मरीतयः), prthvi (पृथिवी), apa (आपः). He further deliberated "Let me create the protectors (लोकपालान्) of the worlds". Further He shaped a human form from the water itself by endowing it with limbs, thus came forth the Virat. With His Tapas (austerity, in the sense of further deliberation) on Virat, there emerged the sense and all other organs.<ref>Swami Gambhirananda (1937) ''Eight Upanishads, Volume 2 (Aitareya, Mundaka, Mandukya and Karika, and  Prasna) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama. (Pages 20-27)</ref>
# Taittriya Upanishad (2.6.1)<ref>Swami Gambhirananda (1989 Second Edition) ''Eight Upanishads, Volume 1 (Isa, Kena, Katha,and Taittriya) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama (Pages 325-327)</ref> mentions He (the Self) wished  (सोऽकामयत । बहु स्यां प्रजायेतेति।) "Let me be many, let me be born". Having so deliberated, he created all this that exists. That Brahman, having created (that) entered into that very thing. This shows that Brahman has entered into the body as the individual Atman. Thus the cognizer, in his essential nature, is none other than the Brahman. Continuing this further the Upanishad in 2.7.1<ref>Swami Gambhirananda (1989 Second Edition) ''Eight Upanishads, Volume 1 (Isa, Kena, Katha,and Taittriya) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama (Pages 341-342)</ref> talks about the conditioned and unconditioned Brahman - In the beginning all this was but the unmanifested (brahman). From that emerged the manifested. That Brahman created Itself by Itself. Therefore It is called the Self-creator.

=== अधिष्ठानम् ॥ Adhisthanam ===
Although Brahman is untouched by the phenomenal world and is independent, still the Jagat is not independent of It. On the very Brahman remain established the three, viz., the enjoyer (the individual Atma), the enjoyable things and the enjoyment.

Many Upanishads support the concept that Brahman (unconditioned) is the substratum/excellent stable establishment for the universe (Kathopanishad 1.2.1, 2.2.8, Brhadaranyaka Upanishad 2.5.15, 4.4.17, Mundaka 2.2.2, Taittriya 3.10.3 and others).

== Brahman in Sampradayas ==
Many siddhantas discuss Brahman, Jiva, Jagat and the means of reconciling identity or duality between them; three following doctrines have large followings and are widely respected.

=== Dvaita Siddhanta ===
Madhavacharya, the propounder of Dvaita system of Vedanta, holds Brahman as a personality called Vishnu, having innumerable auspicious qualities and free from all impurities. Since Vishnu is a personality with attributes, this siddhanta advocates Saguna Brahma as against Advaita siddhanta which believes in Nirguna Brahma which is attributeless. 

Nirguna Brahma according to Madhavacharya is not associated with the attributes of Prakrti, i.e., sattva, rajas, and tamas. Knowledge of Brahman obtained by Jiva through study and rituals results in devotion (bhakti) towards Vishnu.<ref name=":12">Katti, Raghavendra ''Brahman, The Supreme Being in Brahmasutras.'' Bangalore: Sri Vyasa Madhva Samshodhana Pratishana (Pages 7-12)</ref>

=== Vishishtadvaita Siddhanta ===
Ramanujacharya, the propunder of Vishishtadvaita system of Vedanta, holds Brahman to be possessing all the auspicious qualities and is free from all impurities. Brahman is all-knowing, all-pervading, all-powerful, all-merciful, all-blissful, and free from all-limitations of time, space, and causality. He is the cause of the Universe, both sentient and insentient. The individual Atma has the power to act and in its pristine purity, possesses the auspicious qualities resembling those of Brahman, but to a limited extent. Hence the Jiva, in this philosophy, is often described as being identical with Brahman. Right knowledge of Brahman, as in Dvaita philosophy, results in devotion.<ref name=":12" />

=== Advaita Siddhanta ===
Brahman is all-pervading and is pure consciousness, devoid of all qualities and forms. Atman and Brahman are essentially identical and the world of plurality is unreal and illusory. Brahman is the cause of origination, subsistence and dissolution of the world. Jiva is a phenomenon, abounding with avidya, believes in his finiteness and identifies himself with the body and sense organs. As soon as he acquires the knowledge of identity of Jiva and Brahman, he can attain mukti.<ref name=":12" />

== References ==
<references />
[[Category:Vedanta]]
[[Category:Upanishads]]