satyam vada dharmaṃ cara na kasyāpi gļhe na kuṭilaṃ vada

tvam (you) satyam (truth) vada (speak)tvam (you) dharmaṃ (righteousness) cara (follow)na (not) kasyāpi (to anyone) gļhe (lie)na (not) kuṭilaṃ (crooked) vada (speak)

Advaita Vedānta (Ādi Śaṅkarācārya): This verse from the Chāndogyopaniṣad is pivotal in understanding the non-dual nature of reality as it underscores the importance of truth and dharma. Śaṅkarācārya, in his commentary on the Upaniṣads, often emphasizes the role of satya (truth) and dharma in realizing the ultimate reality, Brahman. The instruction to 'speak the truth' and 'follow dharma' is not merely a moral dictum but a means to realize the identity of the individual self (ātman) with the universal self (Brahman). By adhering to truth and righteousness, the individual transcends the limitations of the ego and worldly attachments, moving closer to the understanding of non-duality. This verse, in essence, points to the path of self-realization, where the distinctions between the individual and the universal dissolve, revealing the ultimate truth of Brahman-ātman identity. As Śaṅkarācārya would argue, the cultivation of virtues like truthfulness is a preliminary step in the quest for the knowledge of the Self, which is the ultimate goal of the Upaniṣadic teachings.

Vaiṣṇava tradition (Rāmānujācārya / Madhvācārya): The Vaiṣṇava tradition, particularly through the lens of Rāmānujācārya, interprets this verse as emphasizing the importance of living a life dedicated to Bhagavān (the personal deity) and following the path of bhakti (devotion). The injunction to speak the truth and follow dharma is seen as a fundamental aspect of one's surrender to the divine will. Rāmānujācārya, in his Bhagavad Gītā bhāṣya, highlights the significance of truthfulness and righteousness as means to attain proximity to the Lord. The relationship between the jīva (individual soul) and Īśvara (the Lord) is one of dependence and surrender, where the individual's actions, including speaking the truth and following dharma, are offerings to the divine. This verse, in the Vaiṣṇava context, is a call to a life of devotion and service, where the pursuit of truth and righteousness is a form of worship, facilitating the union of the jīva with Īśvara.

Neo-Vedānta (Swami Vivekānanda / S. Rādhākrishnan): Swami Vivekānanda, in his lectures and writings, often highlighted the practical and universal application of the Upaniṣadic teachings, including the verse from the Chāndogyopaniṣad. He saw the instructions to speak the truth, follow dharma, and cause no harm as principles that could guide human conduct in everyday life, leading to individual and societal upliftment. Vivekānanda emphasized the importance of living a life of integrity, where one's words and actions are in harmony, reflecting the truth of one's being. This adherence to truth and righteousness, he argued, is not only a personal virtue but also a foundation for social harmony and progress. In contemporary life, this verse serves as a reminder of the importance of ethical living, where the pursuit of truth, non-violence, and service to others can lead to personal fulfillment and contribute to the betterment of society. As Vivekānanda would advocate, the practice of these virtues is a path to realizing one's potential and contributing to the welfare of humanity, echoing the universal principles found in the Upaniṣads.

More from this source