oṃ vāṇī tasya vāṇī tasya vāṇī tāṃ vāṇīṃ vad vad tāṃ vāṇīṃ

oṃ (OM) vāṇī (Speech) tasya (of That) vāṇī (is the Speech) tasya (of That) vāṇī (is the Speech) tāṃ (that) vāṇīṃ (Speech) vad (speak) vad (speak) tāṃ (that) vāṇīṃ (Speech)

Advaita Vedānta (Ādi Śaṅkarācārya): This verse from the Taittirīyopaniṣad underscores the non-dual nature of reality, pointing towards the ultimate identity of Brahman and Ātman. Shankara's commentary emphasizes that 'vāṇī' or speech, is not just a faculty of human expression but an aspect of the divine, highlighting the intrinsic connection between the individual self and the universal Brahman. By saying 'tasya vāṇī', the Upaniṣad suggests that speech, or the power of expression, is of 'Him', referring to Brahman. This implies that all forms of knowledge and expression are rooted in the ultimate reality. Thus, the verse 'tāṃ vāṇīṃ vad' - speak that speech, is an exhortation to understand and express the truth of this non-dual reality, aligning one's words and thoughts with the ultimate truth of Brahman. Shankara's reasoning here emphasizes the importance of understanding the true nature of self and reality, guiding the seeker towards the realization of the identity of Ātman and Brahman.

Vaiṣṇava tradition (Rāmānujācārya / Madhvācārya): In the Vaiṣṇava tradition, this verse is seen as an expression of devotion and surrender to the divine. Rāmānujācārya, for instance, would interpret 'tasya vāṇī' as the speech or the word of the Lord, emphasizing the personal relationship between the jīva (individual soul) and Īśvara (the Supreme Lord). The repetition of 'vāṇī' throughout the verse is a call to focus on the divine word, which is seen as a means to attain closeness to God. Speaking 'that' speech means expressing devotion, gratitude, and surrender to the divine will. The Vaiṣṇava emphasis is on the loving relationship between the soul and God, with this verse encouraging the devotee to align their thoughts and words with the divine, fostering a deeper sense of dependence and love for the Supreme. This interpretation highlights the path of devotion and self-surrender as the primary means to achieve spiritual liberation.

Neo-Vedānta (Swami Vivekānanda / S. Rādhākrishnan): Swami Vivekananda and S. Radhakrishnan, key figures of Neo-Vedānta, would likely interpret this verse in the context of its universal and practical applications. They might see 'vāṇī' or speech as symbolizing the power of thought and expression that lies within every individual. The exhortation to 'speak that speech' can be understood as a call to express one's inner truth, to speak from the depth of one's being, unencumbered by external influences. This verse can be seen as encouraging authenticity and honesty in one's words and thoughts, as a path to personal freedom and self-realization. Vivekananda, known for his emphasis on the potential of the human being, would likely view this verse as a reminder of the individual's capacity to express the divine through their thoughts, words, and actions, thereby actualizing their true nature. Radhakrishnan, with his philosophical bent, might further elaborate on how this verse reflects the integral humanism of Vedānta, where the individual's growth is inextricably linked with the realization of the ultimate reality.

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