tat nau danti na ca danti iti na tat vācaḥ vācyam

tat (that) na u (not) danti (bite) na ca (not) danti (bite) iti (thus) na tat (not that) vācaḥ (of speech) vācyam (should be spoken)

Advaita Vedānta (Ādi Śaṅkarācārya): This verse from the Kenopaniṣad underscores the non-dual nature of reality, pointing to the brahman-ātman identity. Shankara, in his commentary on the Kenopaniṣad, emphasizes that the ultimate reality, Brahman, cannot be grasped by the senses or described through speech because it transcends all dualities. The phrase 'tannau-danti na ca dantīti' highlights that Brahman is neither the one that acts nor the one that is acted upon, thereby transcending the duality of subject and object. This understanding leads to the realization that the individual self (ātman) is, in essence, not different from Brahman. Shankara's reasoning on this verse aligns with his overall non-dualistic (Advaita) interpretation of the Upaniṣads, where he posits that the distinctions between the individual and the ultimate reality are ultimately illusory.

Vaiṣṇava tradition (Rāmānujācārya / Madhvācārya): The Vaiṣṇava tradition, particularly through the lens of Rāmānujācārya, views this verse as emphasizing the dependence of the jīva (individual soul) on Īśvara (God). Rāmānuja's visiṣṭādvaita (qualified non-dualism) perspective suggests that while the jīva and Īśvara are distinct, they are also inseparably connected. The verse 'tannau-danti na ca dantīti' is seen as underscoring the passive nature of the jīva in relation to Īśvara's active engagement. The jīva does not act independently but is acted upon by Īśvara, highlighting the concept of divine grace and the necessity of surrender to the divine will. This interpretation underlines the devotional aspect of the Vaiṣṇava tradition, emphasizing the loving relationship between the jīva and Īśvara.

Neo-Vedānta (Swami Vivekānanda / S. Rādhākrishnan): Swami Vivekānanda, a key figure in Neo-Vedānta, interprets this verse in the context of universal applicability and practical spirituality. He emphasizes that the verse points to the transcendent nature of the self, which is beyond the limitations of action and reaction, symbolized by 'biting' and 'being bitten.' Vivekānanda, in his lectures on the Upaniṣads, notes that this transcendent self is the core of every individual and is untouched by the dualities of the material world. This understanding, he argues, is essential for achieving inner peace and freedom. Radhakrishnan, building on this, suggests that the verse invites one to move beyond the confines of ego and the external world, towards a realization of the ultimate reality that underlies all existence. This view stresses the importance of spiritual realization for individual and societal well-being in contemporary life.

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