Aindraṁ cakṣuḥ prāṇaḥ śrutir vāyuḥ

Cakṣuḥ (eye) indraḥ (presides over), prāṇaḥ (life force) vāyuḥ (air), śrutir (hearing) indraḥ (presides over)

Advaita Vedānta (Ādi Śaṅkarācārya): This verse from the Taittirīyopaniṣad is pivotal in establishing the non-dual nature of reality. Shankara's commentary on this Upaniṣad underscores the idea that the ultimate reality, Brahman, is the essence of all existence. By stating 'Aindraṁ cakṣuḥ', the eye is likened to Indra, symbolizing the divine within the individual. Similarly, 'prāṇaḥ śrutir vāyuḥ' points to the breath and ear being akin to life and heaven, respectively, suggesting an intrinsic connection between the human faculties and the cosmic forces. This equivalence highlights the Brahman-ātman identity, where the individual self (ātman) is ultimately one with the universal self (Brahman). Shankara's reasoning, as seen in his Brahmasutra Bhashya, emphasizes the need to look beyond the literal meaning to the deeper, spiritual significance, thereby revealing the unity that underlies all existence. Through such analogies, the Upaniṣads guide the seeker towards realizing this fundamental non-duality, leading to liberation from the bounds of ignorance and suffering.

Vaiṣṇava tradition (Rāmānujācārya / Madhvācārya): The Vaiṣṇava interpretation of this verse focuses on the relational aspect between the jīva (individual soul) and Īśvara (the Supreme Lord). Rāmānujācārya, in his Sri Bhashya, while commenting on the Brahmasutras, often highlights the inseparable relationship between the individual and the divine. The identification of human senses with divine entities (e.g., the eye with Indra) signifies the dependency of the jīva on Īśvara for its very existence and functionality. This relationship is one of loving devotion and surrender, where the recognition of the divine in every aspect of life leads to a deeper, personal connection with the Lord. Madhvācārya, from a Dvaita perspective, would further emphasize the real distinction between the Lord and the individual souls, yet both traditions converge on the idea that understanding and honoring this relationship is key to spiritual progress and ultimate liberation. The verse, therefore, invites the devotee to see the divine hand in every facet of life, fostering a sense of reverence and worship.

Neo-Vedānta (Swami Vivekānanda / S. Rādhākrishnan): Swami Vivekananda, in his lectures and writings, often drew upon verses like 'Aindraṁ cakṣuḥ' to illustrate the universal principles that underlie human existence. He saw in this Upaniṣadic statement a call to recognize the divine potential within each individual, a potential that can be realized through the cultivation of spiritual practices and the broadening of one's perspective. The equation of the eye with Indra, of breath with life, and the ear with heaven, speaks to the interconnectedness of all things and the intrinsic divinity of the human being. Vivekananda's emphasis was on the practical application of such knowledge, encouraging individuals to strive for self-realization and service to humanity. Similarly, Sarvepalli Radhakrishnan, in his philosophical works, highlighted the relevance of the Upaniṣads to contemporary life, pointing out that verses like these offer a profound basis for ethics, morality, and spiritual growth. They remind us of our place within the larger cosmic scheme and our responsibility to live in harmony with nature and our fellow beings, thereby achieving a balanced and fulfilling life.

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