tataḥ śataguṇa vardhamānaḥ abhavat tena vai pitṛ́n

tataḥ (then) vardhamānaḥ (increasing) śataguṇaḥ (a hundredfold) abhavat (became) tena (by him) pitṛ́n (the ancestors) vai (indeed)

Advaita Vedānta (Ādi Śaṅkarācārya): This verse is often seen as an illustration of the non-dual nature of reality, as the growth of the fire is not an external addition but an unfolding of its inherent potency. Shankara, in his commentary on the Brihadaranyaka Upanishad, highlights the concept of 'vivéka' or discernment, which allows the individual to distinguish between the transient and the eternal. In the context of this verse, such discernment leads to the recognition that the ancestors, symbolizing the past and the lineage, are ultimately aspects of the universal Self, or Brahman. The hundredfold growth signifies the expansive nature of this Self, which encompasses all existence. By realizing this non-dual identity, one transcends the limitations of worldly relationships and achieves liberation. Shankara's emphasis on the absolute reality of Brahman underscores that all growth, including the hundredfold expansion, is merely a manifestation of this singular, unchanging essence. This understanding aligns with his commentary on the Taittiriya Upanishad, where he explicates the concept of 'satyam' or truth as the core of all existence, pointing towards the ultimate reality that underlies all phenomena, including the growth described in this verse.

Vaiṣṇava tradition (Rāmānujācārya / Madhvācārya): The Vaiṣṇava interpretation of this verse focuses on the devotional aspect, seeing the growth of the fire as a metaphor for the grace of Īśvara (the Supreme Lord) that nurtures and expands the devotion of the jīva (the individual soul). Rāmānujācārya, in his Sri Bhashya, discusses the concept of 'prapatti' or self-surrender, where the jīva, recognizing its dependence on Īśvara, seeks refuge in Him. This surrender is likened to the fuel that feeds the fire, causing it to grow. The hundredfold expansion symbolizes the boundless grace of Īśvara in response to the devotee's surrender. The mention of 'pitṛ́n' (ancestors) suggests the lineage of devotion and the continuity of spiritual heritage, emphasizing that true growth is rooted in a deepening relationship with the divine. Madhvācārya's Dvaita philosophy also underscores the distinction between the jīva and Īśvara, yet highlights the jīva's potential for spiritual growth through devotion, illustrated by the image of the fire's expansion, which represents the jīva's increasing capacity for love and service to Īśvara.

Neo-Vedānta (Swami Vivekānanda / S. Rādhākrishnan): Swami Vivekānanda, in his lectures on the Upanishads, often drew upon verses like this to illustrate the universal principles of growth and self-realization. He saw the hundredfold expansion of the fire as a powerful symbol of human potential, suggesting that each individual has the capacity to grow and expand far beyond their current limitations. This growth is not merely quantitative but qualitative, reflecting an increase in wisdom, compassion, and spiritual awareness. The mention of 'pitṛ́n' reminds us of our debt to the past and our responsibility to the future, emphasizing the importance of preserving and enhancing our spiritual and cultural heritage. Vivekānanda's emphasis on practical Vedānta—applying spiritual principles to everyday life—finds resonance in this verse, as it encourages individuals to seek growth and self-realization not in isolation, but in a way that contributes positively to the world around them. Similarly, S. Rādhākrishnan, in his philosophical works, discussed the significance of integrating spiritual growth with social responsibility, echoing the sentiment of this verse in advocating for a holistic approach to personal and societal development.

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