satyaṃ vada dharmaṃ cara

tvam (you) satyaṃ (truth) vada (speak) dharmaṃ (righteousness) cara (follow)

Advaita Vedānta (Ādi Śaṅkarācārya): In his commentary on the Chāndogyopaniṣad, Shankara interprets 'satyaṃ vada, dharmaṃ cara' as a call to realize the ultimate truth, which is the non-dual essence of Brahman. According to Shankara, speaking the truth (satyaṃ vada) is not just about verbal honesty but about realizing the true nature of the self, which is identical with Brahman. Following the dharma (dharmaṃ cara) means living a life that is in harmony with this ultimate reality, free from the distortions of ignorance and ego. This verse, for Shankara, points to the path of self-inquiry and the realization of the brahman-ātman identity, where the individual self (ātman) is understood to be one with the universal Brahman. This understanding is central to Shankara's non-dual (Advaita) philosophy, emphasizing the oneness of all existence.

Vaiṣṇava tradition (Rāmānujācārya / Madhvācārya): Within the Vaiṣṇava tradition, 'satyaṃ vada, dharmaṃ cara' is seen as a fundamental principle guiding the devotional life of a devotee. Rāmānujācārya, a key figure in the Viśiṣṭādvaita (qualified non-dualism) school, interprets this verse as emphasizing the importance of truthful living and adherence to one's duty (dharma) as a means of cultivating love and devotion for God (Īśvara). For Rāmānuja, following one's dharma is not merely a moral or social obligation but a way of expressing love and loyalty to God, recognizing that all actions should be dedicated to Him. This approach underlines the personal relationship between the jīva (individual soul) and Īśvara (the Lord), with truthfulness and dharmic living being essential virtues in this relationship.

Neo-Vedānta (Swami Vivekānanda / S. Rādhākrishnan): Swami Vivekānanda and Sarvepalli Rādhākrishnan, among other modern interpreters, see 'satyaṃ vada, dharmaṃ cara' as a universally applicable principle that transcends sectarian boundaries. Vivekānanda, in his lectures and writings, often emphasized the practical aspects of Vedāntic teachings, including the importance of honesty and living a life of righteousness. He saw these principles as essential for individual and societal progress, promoting a sense of unity and cooperation among people. Rādhākrishnan, with his background in philosophy and statesmanship, further underscored the relevance of such ancient principles in contemporary life, arguing that they provide a foundation for ethical living and global understanding. In this view, the verse encourages a path of personal integrity and service, contributing to the betterment of the world.

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