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तत्र को मोहः कः शोक एकत्वमनुपश्यतः ॥ ७ ॥ (Isav. Upan. 7)<ref>Isopanishad ([https://sa.wikisource.org/wiki/%E0%A4%88%E0%A4%B6%E0%A5%8B%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A4%E0%A5%8D Complete])</ref></blockquote>When to the man of realization all beings become the very Self, then what delusion and sorrow can be there for that seer of Oneness.<ref>Swami Gambhirananda (1989 Second Edition) ''Eight Upanishads, Volume 1 (Isa, Kena, Katha,and Taittriya) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama (Page 13)</ref>

तत्र को मोहः कः शोक एकत्वमनुपश्यतः ॥ ७ ॥ (Isav. Upan. 7)<ref>Isopanishad ([https://sa.wikisource.org/wiki/%E0%A4%88%E0%A4%B6%E0%A5%8B%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A4%E0%A5%8D Complete])</ref></blockquote>When to the man of realization all beings become the very Self, then what delusion and sorrow can be there for that seer of Oneness.<ref>Swami Gambhirananda (1989 Second Edition) ''Eight Upanishads, Volume 1 (Isa, Kena, Katha,and Taittriya) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama (Page 13)</ref>

Their apparent difference (Brahman and Atman), but essential unity is admirably presented in the following oft-quoted mantras from '''Mundakopanishad''' <blockquote>द्वा सुपर्णा सयुजा सखाया समानं वृक्षं परिषस्वजाते । तयोरन्यः पिप्पलं स्वाद्वत्त्यनश्नन्नन्यो अभिचाकशीति ॥ १ ॥ </blockquote><blockquote>समाने वृक्षे पुरुषो निमग्नोऽनीशया शोचति मुह्यमानः । जुष्टं यदा पश्यत्यन्यमीशमस्य महिमानमिति वीतशोकः ॥ २ ॥ (Mund. Upan. 3.1.1-2)<ref name=":4" /></blockquote>Summary : Two birds of beautiful plumage (Atman and Brahman) who are friends and always joined together, cling to the same tree (the body). One of them (the Atman) eats sweet (and bitter) fruits (experiences the results of its past work), but the other only looks on without eating. On the same tree (wholly identified with the body), the individual Atman (Purusha) remains drowned (stuck); is overwhelmed by his impotence and suffers. When is sees the other, the Infinite Being (Isham) and His glory, then it becomes liberated from sorrow <ref name=":2" /><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 145-147)</ref>.

Their apparent difference (Brahman and Atman), but essential unity is admirably presented in the following oft-quoted mantras from '''Mundakopanishad''' <blockquote>द्वा सुपर्णा सयुजा सखाया समानं वृक्षं परिषस्वजाते । तयोरन्यः पिप्पलं स्वाद्वत्त्यनश्नन्नन्यो अभिचाकशीति ॥ १ ॥ </blockquote><blockquote>समाने वृक्षे पुरुषो निमग्नोऽनीशया शोचति मुह्यमानः । जुष्टं यदा पश्यत्यन्यमीशमस्य महिमानमिति वीतशोकः ॥ २ ॥ (Mund. Upan. 3.1.1-2)<ref name=":4" /></blockquote>Summary : Two birds of beautiful plumage (Atman and Brahman) who are friends and always joined together, cling to the same tree (the body). One of them (the Atman) eats sweet (and bitter) fruits (experiences the results of its past work), but the other only looks on without eating. On the same tree (wholly identified with the body), the individual Atman (Purusha) remains drowned (stuck); is overwhelmed by his impotence and suffers. When is sees the other, the Infinite Being (Isham) and His glory, then it becomes liberated from sorrow<ref name=":2" /><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 145-147)</ref>.

'''Mandukya Upanishad's''' Mahavakya reinforces the concept of unity of Atma and Paramatma.<blockquote>सर्वं ह्येतद् ब्रह्मा अयमात्मा ब्रह्म। This Atma is Brahman (Mand. Upan. 2)</blockquote>When Nachiketa presses Yama to reveal to him the supreme secret, Yama says <ref name=":1">Sharma, Ram Murthy. (1987 2nd edition) ''Vaidik Sahitya ka Itihas'' Delhi : Eastern Book Linkers (Page 143)</ref><blockquote>यदेवेह तदमुत्र यदमुत्र तदन्विह । मृत्योः स मृत्युमाप्नोति य इह नानेव पश्यति ॥ १० ॥</blockquote><blockquote>yadeveha tadamutra yadamutra tadanviha । mr̥tyoḥ sa mr̥tyumāpnoti ya iha nāneva paśyati ॥ 10 ॥</blockquote><blockquote>मनसैवेदमाप्तव्यं नेह नानाऽस्ति किंचन । मृत्योः स मृत्युं गच्छति य इह नानेव पश्यति ॥ ११ ॥ (Kath. Upan. 2.1.10-11)<ref>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%A6%E0%A5%8D%E0%A4%B5%E0%A4%BF%E0%A4%A4%E0%A5%80%E0%A4%AF%E0%A5%8B%E0%A4%A7%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AF%E0%A4%83/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%A5%E0%A4%AE%E0%A4%B5%E0%A4%B2%E0%A5%8D%E0%A4%B2%E0%A5%80 Adhyaya 2, Valli 1])</ref></blockquote><blockquote>manasaivedamāptavyaṁ neha nānā'sti kiṁcana । mr̥tyoḥ sa mr̥tyuṁ gacchati ya iha nāneva paśyati ॥ 11 ॥ (Kath. Upan. 2.1.10-11)</blockquote>Summary : The entity that exists in all beings from Brahma down to immovable and appears as non-Brahman owing to limiting factors (Jiva) is different from Supreme Brahman is subject to birth and death. What indeed is here, is there and what is there is here. He who sees as though there is difference between the two, goes from death to death. This is to be attained through the Manas only. There is no diversity between the Self and Supreme Brahman.'''<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>'''

'''Mandukya Upanishad's''' Mahavakya reinforces the concept of unity of Atma and Paramatma.<blockquote>सर्वं ह्येतद् ब्रह्मा अयमात्मा ब्रह्म सोऽयमात्मा चतुष्पात् ॥ २ ॥(Mand. Upan. 2)<ref>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>All this is surely Brahman. The Self os Brahman. The Self, such as It is, is possessed of four quarters.<ref>Swami Gambhirananda (1937) ''Eight Upanishads, Volume 2 (Aitareya, Mundaka, Mandukya and Karika, and  Prasna) With the Commentary of Sankaracarya.'' Calcutta: Advaita Ashrama. (Page 181)</ref>

 

In '''Kathopanishad''', the concept is revealed when Nachiketa presses Yama to reveal to him the supreme secret, Yama says <ref name=":1">Sharma, Ram Murthy. (1987 2nd edition) ''Vaidik Sahitya ka Itihas'' Delhi : Eastern Book Linkers (Page 143)</ref><blockquote>यदेवेह तदमुत्र यदमुत्र तदन्विह । मृत्योः स मृत्युमाप्नोति य इह नानेव पश्यति ॥ १० ॥</blockquote><blockquote>yadeveha tadamutra yadamutra tadanviha । mr̥tyoḥ sa mr̥tyumāpnoti ya iha nāneva paśyati ॥ 10 ॥</blockquote><blockquote>मनसैवेदमाप्तव्यं नेह नानाऽस्ति किंचन । मृत्योः स मृत्युं गच्छति य इह नानेव पश्यति ॥ ११ ॥ (Kath. Upan. 2.1.10-11)<ref>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%A6%E0%A5%8D%E0%A4%B5%E0%A4%BF%E0%A4%A4%E0%A5%80%E0%A4%AF%E0%A5%8B%E0%A4%A7%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AF%E0%A4%83/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%A5%E0%A4%AE%E0%A4%B5%E0%A4%B2%E0%A5%8D%E0%A4%B2%E0%A5%80 Adhyaya 2, Valli 1])</ref></blockquote><blockquote>manasaivedamāptavyaṁ neha nānā'sti kiṁcana । mr̥tyoḥ sa mr̥tyuṁ gacchati ya iha nāneva paśyati ॥ 11 ॥ (Kath. Upan. 2.1.10-11)</blockquote>Summary : The entity that exists in all beings from Brahma down to immovable and appears as non-Brahman owing to limiting factors (Jiva) is different from Supreme Brahman, is subject to birth and death. What indeed is here, is there and what is there is here. He who sees as though there is difference between the two, goes from death to death. This is to be attained through the Manas only. There is no diversity between the Self and Supreme Brahman.'''<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>'''

'''Brhdaranyaka Upanishad''' also lays emphasis of the Unity of Jiva and Brahman (2.4.6-9)<ref name=":12">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])</ref>. In the [[Yajnavalkya Maitreyi samvada (याज्ञवल्क्यमैत्रेय्योः संवादः)|Yajnavalkya and Maitreyi Samvada]] the very nature of Atman is defined. All the brahmanas, kshatriyas, the whole world, the countless devatas and all beings are the form of Atman only.<ref name=":1" />

'''Brhdaranyaka Upanishad''' also lays emphasis of the Unity of Jiva and Brahman (2.4.6-9)<ref name=":12">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])</ref>. In the [[Yajnavalkya Maitreyi samvada (याज्ञवल्क्यमैत्रेय्योः संवादः)|Yajnavalkya and Maitreyi Samvada]] the very nature of Atman is defined. All the brahmanas, kshatriyas, the whole world, the countless devatas and all beings are the form of Atman only.<ref name=":1" />