yat prāṇaḥ na vriyate prāṇāt yat sarvam idam tvaham

ahaṁ (I) tvam (you) idam (this) sarvam (everything) prāṇāt (from life) yat (which) prāṇaḥ (life) na (not) vriyate (is obtained)

Advaita Vedānta (Ādi Śaṅkarācārya): This verse from the Praśnopaniṣad underscores the non-dual nature of reality, emphasizing that the ultimate reality, Brahman, is the source from which life and everything else originates. Ādi Śaṅkarācārya, in his commentary on the Upaniṣads, interprets the phrase 'yatprāṇo na vriyate prāṇād' as indicating that Brahman is the essence of life, and life is not separate from Brahman. The phrase 'yatsarvamidaṃ tvaham' further reinforces this idea, suggesting that everything in the universe is a manifestation of this ultimate reality. Therefore, the statement 'I am' (tvaham) refers to the identification of the individual self (ātman) with Brahman, the absolute. This non-dual reading is central to Advaita Vedānta, where the distinction between the individual self and the ultimate reality is seen as an illusion. Shankara's reasoning on this verse aligns with his broader philosophical stance, where the ultimate goal of human existence is to realize this unity of the self with Brahman. The emphasis here is on the understanding and realization of the true nature of the self, beyond the ephemeral and illusory distinctions of the worldly realm.

Vaiṣṇava tradition (Rāmānujācārya / Madhvācārya): The Vaiṣṇava tradition offers a somewhat different interpretation of this verse, focusing on the devotional aspect and the relationship between the individual soul (jīva) and the Supreme Lord (Īśvara). Rāmānujācārya, a key figure in the Vaiṣṇava tradition, would likely view this verse as an expression of the dependence of all things on the divine will. The phrase 'yatprāṇo na vriyate prāṇād' suggests that life itself is a gift from the Lord, and 'yatsarvamidaṃ tvaham' could be seen as an affirmation of the Lord's presence in all things. The statement 'I am' here might be interpreted as the jīva's recognition of its own dependence on and connection to Īśvara, leading to a deep sense of devotion and surrender. Madhvācārya, representing a more dualistic strand of Vaiṣṇavism, might emphasize the real distinction between the jīva and Īśvara, while still highlighting the jīva's complete dependence on the Lord for its existence and understanding. In both interpretations, the verse is seen as a call to recognize and embrace one's relationship with the divine, albeit with differing degrees of emphasis on the nature of that relationship.

Neo-Vedānta (Swami Vivekānanda / S. Rādhākrishnan): Swami Vivekānanda and S. Rādhākrishnan, key figures in the Neo-Vedānta movement, would interpret this verse in a manner that emphasizes its universal and practical application. Vivekānanda, known for his emphasis on the potential of the human spirit, might view 'yatprāṇo na vriyate prāṇād' as a call to recognize the divine spark within every being. The phrase 'yatsarvamidaṃ tvaham' could be seen as an affirmation of the interconnectedness of all things, leading to a sense of unity and solidarity among all human beings. The statement 'I am' here is not just a philosophical affirmation but a practical call to action, encouraging individuals to embody their highest potential and work towards the betterment of humanity. Rādhākrishnan, with his focus on the synthesis of Eastern and Western philosophical traditions, might interpret this verse as an expression of the universal human quest for meaning and connection. He would likely emphasize how this verse, and the Upaniṣads in general, offer insights into the human condition that transcend temporal and cultural boundaries, providing a foundation for a global ethic of compassion, understanding, and cooperation.

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