satyam vada dharmaṃ cara svādhyāyān mā akṣam icchā nityam eva trivargāya

satyam (truth) vada (speak) dharmaṃ (righteousness) cara (follow) svādhyāyān (from self-study) akṣam (indolence) mā icchā (do not desire) nityam (always) eva (indeed) trivargāya (for the three aims)

Advaita Vedānta (Ādi Śaṅkarācārya): This verse from the Taittirīyopaniṣad underscores the importance of adhering to truth, dharma, and self-study as a means to realize the ultimate reality, Brahman. Shankara's commentary on this verse would likely emphasize that speaking the truth and following dharma are outward manifestations of an inward pursuit of self-knowledge. The injunction to never be lazy in self-study (svādhyāyān mā akṣam icchā) points to the necessity of constant introspection and study of sacred texts to understand the non-dual nature of reality. This pursuit is essential for realizing the identity of the individual self (ātman) with the universal self (Brahman), which is the ultimate goal of Advaita Vedanta. Shankara's reasoning, as seen in his commentaries on the Upanishads, stresses the importance of understanding the ultimate reality beyond the mundane duties and moral codes, thus hinting at the transcendent nature of truth and self.

Vaiṣṇava tradition (Rāmānujācārya / Madhvācārya): In the Vaiṣṇava tradition, this verse is seen as a guideline for the devotee's conduct. Rāmānujācārya would interpret 'satyam vada' and 'dharmaṃ cara' as the foundation of a life dedicated to the service of Īśvara (the Supreme Lord), emphasizing the importance of truthfulness and righteous living as a means to please the Lord. 'Svādhyāyān mā akṣam icchā' would be understood as the necessity for constant engagement with sacred scriptures and the teachings of the guru, not merely for intellectual grasp but for deepening devotion and understanding of the Lord's nature. The relationship between the jīva (individual soul) and Īśvara is central, with these practices fostering a deeper dependence on and love for the Lord, ultimately leading to liberation (mokṣa) through devotion (bhakti) rather than just knowledge. Madhvācārya, with his emphasis on the difference between the soul and God, would highlight the importance of these practices in recognizing and worshiping the supremacy of Īśvara.

Neo-Vedānta (Swami Vivekānanda / S. Rādhākrishnan): Swami Vivekānanda would interpret this verse as a call to practical action, emphasizing that speaking the truth, following dharma, and engaging in self-study are not just moral or religious duties but essential for the development of the individual and society. He would see 'satyam vada' as the foundation of all relationships, 'dharmaṃ cara' as the adherence to universal principles of righteousness that transcend sectarian boundaries, and 'svādhyāyān mā akṣam icchā' as the continuous pursuit of knowledge and self-improvement. Vivekānanda's emphasis on service to humanity as a means of realizing the divine would lead him to stress the social implications of these injunctions, seeing them as a path to both individual liberation and social uplift. S. Radhakrishnan, focusing on the philosophical aspects, would highlight the universal applicability of these principles, arguing that they represent a common ethical and spiritual ground that can unite humanity beyond religious and cultural differences, pointing towards a global ethic rooted in ancient Indian wisdom.

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