satyam brahmā nityam brahm sarvam brahm na hi nāsti brahmaṇaḥ satyam

brahmā satyam (Brahman is truth) brahm nityam (Brahman is eternal) brahm sarvam (Brahman is all) brahmaṇaḥ (of Brahman) na hi (not indeed) nāsti (there is not) satyam (truth)

Advaita Vedānta (Ādi Śaṅkarācārya): This verse from the Praśnopaniṣad underscores the central tenets of Advaita Vedānta, emphasizing the non-dual nature of reality. Shankara interprets 'satyam brahmā' as affirming that Brahman is the ultimate truth, unchanging and eternal. The phrase 'nityam brahm' reinforces this, indicating that Brahman is not just a static truth but an enduring, dynamic reality. The identity of Brahman and Ātman is crucial here; when the verse states 'sarvam brahm,' it points to the all-encompassing nature of Brahman, suggesting that everything, including the individual self (Ātman), is ultimately Brahman. This interpretation aligns with Shankara's commentary on the Taittiriya Upanishad, where he argues that the realization of the identity of Brahman and Ātman is the key to liberation. Thus, this verse supports the non-dualistic view that the ultimate reality is singular, and the distinctions between the individual self and the universal self are illusory.

Vaiṣṇava tradition (Rāmānujācārya / Madhvācārya): The Vaiṣṇava tradition, particularly through the lens of Rāmānujācārya, views this verse as emphasizing the dependence of all reality on the divine, Īśvara. Rāmānuja would interpret 'satyam brahmā' as affirming the truth and reality of the personal God, emphasizing the loving and gracious nature of the divine. The phrase 'nityam brahm' highlights the eternal nature of this relationship between the jīva (individual soul) and Īśvara. For Rāmānuja, 'sarvam brahm' suggests that everything is connected to and dependent on Brahman, but with a distinction between the soul and God, emphasizing a qualified non-dualism (Viśiṣṭādvaita). This relationship is built on devotion and the recognition of God's grace. Madhvācārya, on the other hand, might stress the real difference between the individual souls and God, interpreting this verse in the context of his Dvaita (dualistic) philosophy, where the dependence of all on Brahman is a fundamental aspect of reality.

Neo-Vedānta (Swami Vivekānanda / S. Rādhākrishnan): Swami Vivekānanda and S. Radhakrishnan, key figures in Neo-Vedānta, would interpret this verse as a call to realize the universal and eternal principles that govern human existence. For Vivekānanda, 'satyam brahmā' symbolizes the pursuit of truth as the highest human endeavor, reflecting his emphasis on the practical application of Vedāntic principles in everyday life. The phrase 'nityam brahm' resonates with his belief in the eternal and unchanging nature of the soul, which is reflected in his lectures on the 'Real Nature of the Soul.' Vivekānanda might see 'sarvam brahm' as an affirmation of the unity and interconnectedness of all existence, encouraging individuals to recognize and respect this unity in their daily lives. Similarly, Radhakrishnan, with his philosophical inclination towards both the spiritual and the rational, would likely interpret this verse as a testament to the profound insight of Indian philosophy into the nature of reality and our place within it, emphasizing the universal relevance of such ancient wisdom in contemporary life.

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