tat dvayam brahma puṇyaṃ nā akṣaraṃ yat jyotsnayā nikhilāni bhūtāni

tat (that) dvayam (dual or twofold) brahma (reality) puṇyaṃ (pure) nā (not) akṣaraṃ (imperishable) yat (which) jyotsnayā (by the light) nikhilāni (all) bhūtāni (beings)

Advaita Vedānta (Ādi Śaṅkarācārya): This verse is pivotal in establishing the non-dual nature of Brahman. Shankara interprets 'tad-dvayam' as referring to the two aspects of Brahman: the higher, unmanifest Brahman and the lower, manifest Brahman. However, he argues that this duality is only from the standpoint of the ignorance-bound individual. In reality, Brahman is one, indivisible, and imperishable. Shankara's commentary on this verse emphasizes that the 'jyotsnayā' or effulgence of Brahman is not something separate from Brahman itself but is Brahman's inherent nature. This effulgence, which enlightens all beings, points to the ultimate identity of Brahman and Ātman, underscoring that the individual self (jīva) is not distinct from the universal Self (Brahman). The essence of this verse, therefore, is the affirmation of the non-dual reality that underlies all existence.

Vaiṣṇava tradition (Rāmānujācārya / Madhvācārya): The Vaiṣṇava tradition approaches this verse with a focus on the relationship between the individual soul (jīva) and the Supreme Lord (Īśvara). Rāmānujācārya, for example, would interpret 'tad-dvayam brahma' as indicating the transcendent and immanent aspects of God, where the transcendent aspect is the ultimate, unchanging reality, and the immanent aspect is God's presence within the world and in the hearts of all beings. This interpretation emphasizes the dependency of all beings on God for their existence and well-being, highlighting the devotional path as the means to realize one's true relationship with the Divine. The 'jyotsnayā' in this context symbolizes God's grace that sustains and illuminates all creation, beckoning the devotee towards a deeper understanding and love for the Supreme.

Neo-Vedānta (Swami Vivekānanda / S. Rādhākrishnan): This verse offers profound insights into the nature of reality and our place within it. Swami Vivekānanda, inspired by the Upaniṣads, would see the 'tad-dvayam brahma' as symbolizing the potential for human evolution from a lower to a higher state of consciousness. The 'jyotsnayā' or effulgence represents the divine spark within every individual, which, when recognized and nurtured, can lead to self-realization and enlightenment. This understanding is not merely philosophical but has practical applications in contemporary life, guiding us towards a path of self-discovery, universal compassion, and service. In the words of Vivekānanda, 'Each soul is potentially divine. The goal is to manifest this divinity within.' This verse, thus, serves as a reminder of our innate potential and the universal interconnectedness, inspiring a life of purpose, harmony, and spiritual growth.

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