satyaṃ vada dharmaṃ cara na vidyāt svādhyāyāt

satyaṃ (truth) vada (speak) dharmaṃ (righteousness) cara (follow) svādhyāyāt (from self-study) na vidyāt (do not deviate)

Advaita Vedānta (Ādi Śaṅkarācārya): In his commentary on the Chāndogyopaniṣad, Ādi Śaṅkarācārya interprets this verse as emphasizing the importance of self-inquiry (svādhyāya) in realizing the non-dual nature of reality. Shankara reasons that speaking the truth (satyaṃ vada) and following dharma are necessary for purifying the mind, which is a prerequisite for self-inquiry. By stating 'na vidyāt svādhyāyāt', the Upaniṣad underscores the centrality of self-study in understanding the brahman-ātman identity. This verse, according to Shankara, encourages the seeker to delve into the nature of the Self, ultimately leading to the realization of the oneness of brahman and ātman. Through this process, one transcends the limitations of the individual self and realizes the ultimate reality. Shankara's interpretation thus highlights the verse's significance in the pursuit of spiritual liberation.

Vaiṣṇava tradition (Rāmānujācārya): Rāmānujācārya, in his commentary on the Chāndogyopaniṣad, views this verse as emphasizing the importance of devotion (bhakti) and self-surrender (prapatti) in the pursuit of spiritual growth. According to Rāmānuja, speaking the truth (satyaṃ vada) and following dharma are essential for cultivating a pure heart, which is receptive to the divine grace of Īśvara. The phrase 'na vidyāt svādhyāyāt' is seen as encouraging the devotee to engage in constant self-reflection and study of scriptures, which facilitates a deeper understanding of the relationship between the individual self (jīva) and the Supreme Lord (Īśvara). Rāmānuja's interpretation thus underscores the significance of this verse in the Vaiṣṇava tradition, where devotion and self-surrender are seen as the primary means of achieving spiritual liberation and realizing the ultimate goal of loving service to the Lord.

Neo-Vedānta (Swami Vivekānanda / S. Rādhākrishnan): Swami Vivekānanda, in his lectures and writings, often emphasized the practical applications of this verse in contemporary life. He viewed 'satyaṃ vada' as a call to honest and truthful living, which is essential for personal integrity and social harmony. 'Dharmaṃ cara' is seen as a directive to follow a path of righteous living, which is guided by universal principles of morality and ethics. The phrase 'na vidyāt svādhyāyāt' is interpreted as an encouragement to engage in continuous self-education and self-reflection, which enables individuals to adapt to changing circumstances and grow in wisdom. According to Vivekānanda, this verse offers a universal message that transcends cultural and religious boundaries, promoting a way of life that is grounded in truth, morality, and self-awareness. Similarly, S. Rādhākrishnan, in his writings, highlighted the relevance of this verse in modern times, citing its importance in fostering a culture of honesty, integrity, and intellectual curiosity.

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