tat + nau + mayi + brahma - dṛṣṭyā + dṛṣṭam + yat + brahma + tvam

tat (that) brahma (Brahman) tvam (you) eva (indeed) mayi (in me) nau (in you) brahma - dṛṣṭyā (by the vision of Brahman) dṛṣṭam (seen) yat (which) brahma (is Brahman)

Advaita Vedānta (Ādi Śaṅkarācārya): This verse underscores the fundamental non-duality of Brahman and Ātman, a cornerstone of Advaita philosophy. Shankara, in his commentary on the Īśopaniṣad, emphasizes that the seer and the seen are ultimately one. The phrase 'tannau mayi brahmadṛṣṭyā dṛṣṭam' suggests that through the vision of Brahman, one realizes the identity of the individual self (jīva) with the ultimate reality (Brahman). This understanding negates the duality between the individual and the divine, pointing to the ultimate truth of non-duality. Shankara's reasoning here aligns with his broader exposition in the Brahmasūtrabhāṣya, where he argues for the ultimate identity of Brahman and Ātman, accessible through the removal of ignorance (avidyā) and the cultivation of true knowledge (vidyā). This verse, therefore, serves as a pivotal moment in the text, guiding the seeker towards the realization of this profound non-dual truth.

Vaiṣṇava tradition (Rāmānujācārya): The Vaiṣṇava interpretation of this verse focuses on the loving relationship between the jīva (individual soul) and Īśvara (the Lord). Rāmānujācārya, in his commentary, highlights the importance of bhakti (devotion) in realizing this relationship. The phrase 'yad brahma tvam' is seen as an affirmation of the personal nature of the ultimate reality, who is not just an impersonal Brahman but a loving God with whom the jīva can have a personal relationship. This verse, according to Rāmānuja, suggests that through devotion and the cultivation of a vision that sees the divine in all (brahmadṛṣṭyā), one can realize the presence of the Lord within oneself and in all beings. This realization is not merely a matter of intellectual understanding but a transformative experience that fills the heart with love and devotion. Thus, this verse is seen as a call to devotion and a promise of the intimate presence of the divine in the life of the devotee.

Neo-Vedānta (Swami Vivekānanda / S. Rādhākrishnan): This verse is understood in the context of universal spirituality and practical application in contemporary life. Swami Vivekānanda, in his lectures and writings, often emphasized the importance of realizing the divine within. He saw this verse as a powerful reminder of the human potential for self-realization and the importance of cultivating a universal vision that recognizes the divine in all beings. According to Vivekānanda, the phrase 'tannau mayi brahmadṛṣṭyā dṛṣṭam' suggests that through the practice of Yoga and the development of a higher consciousness, one can experience the unity of all existence and recognize the presence of the divine within oneself and in the world. S. Radhakrishnan further elaborates this idea, suggesting that the realization of the identity of the individual self with the ultimate reality is not just a philosophical concept but a living experience that transforms one's life and relations with others. This verse, therefore, is seen as a call to spiritual practice and self-realization, offering a vision of human unity and divine presence that is both deeply personal and universally applicable.

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