satyaṃ vada dharmaṃ cara na hiṃsyān mā ātma-vat

tvam (you) satyaṃ (truth) vada (speak) dharmaṃ (righteousness) cara (follow) mā (not) ātma-vat (towards yourself) hiṃsyān (you should harm) na (no)

Advaita Vedānta (Ādi Śaṅkarācārya): This verse from the Taittirīyopaniṣad underscores the importance of living a life based on truth and non-violence, which are fundamental principles for realizing the ultimate reality, Brahman. According to Shankara, the emphasis on 'satyaṃ vada' and 'na hiṃsyān' points to the cultivation of a pure mind, unadulterated by falsehood and harm towards others. This purity of mind is essential for understanding the identity of the individual self (ātman) with the universal self (Brahman). Shankara's commentary on the Brahmasutra (1.1.1) highlights the need for self-inquiry and the rejection of harmful actions as a means to realize this non-dual identity. The directive to treat others as oneself ('mā ātma-vat') suggests that the distinctions between the self and the other are ultimately illusory, reinforcing the Advaita perspective that all beings are interconnected and essentially one with Brahman.

Vaiṣṇava tradition (Rāmānujācārya / Madhvācārya): The Vaiṣṇava tradition interprets this verse in light of the relationship between the individual soul (jīva) and the Supreme Lord (Īśvara). Rāmānujācārya, in his commentary on the Brahmasutra, emphasizes the importance of living a life devoted to the Lord, characterized by truthfulness ('satyaṃ vada') and non-violence ('na hiṃsyān'), as a means of achieving spiritual growth and eventual liberation. The directive to treat others with the same care as one would oneself ('mā ātma-vat') reflects the Vaiṣṇava emphasis on compassion and love for all beings, seen as parts of the Lord. Madhvācārya, in his works, further elucidates that the practice of dharma, as mentioned in the verse, involves recognizing the inherent dependence of all beings on the Supreme, thereby fostering a sense of devotion and responsibility towards the divine and towards all living entities.

Neo-Vedānta (Swami Vivekānanda / S. Rādhākrishnan): Swami Vivekānanda and S. Rādhākrishnan, key figures of Neo-Vedānta, interpret this verse as a call to universal ethics and spiritual awakening. According to Vivekānanda, the emphasis on truth and non-violence is not merely a moral prescription but a spiritual practice that leads to the realization of the inherent unity of all existence. In his lecture 'The Essence of Vedanta', Vivekānanda highlights the importance of living a life based on the principles of truth, non-violence, and self-control as a means to achieve the highest goal of human life—self-realization. Rādhākrishnan, in his writings, further emphasizes the universal applicability of these principles, suggesting that they form the basis of a global ethic that transcends cultural and religious boundaries, facilitating a more harmonious and enlightened world. The directive to treat others as oneself underscores the Neo-Vedāntic vision of a world community based on mutual respect, understanding, and the recognition of the shared human spirit.

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