The 'Tat Tvam Asi Dhyana Mantra (Final)' is a contemplative mantra based on the Mahavakya (great saying) 'Tat Tvam Asi' (That Thou Art), which originates from the Chandogya Upanishad (6.8.7). This Upanishadic statement, taught by the sage Uddalaka Aruni to his son Shvetaketu, encapsulates the core non-dual (Advaita) teaching that the individual self (Atman) is identical with the ultimate reality (Brahman). The mantra is used in dhyana (meditation) to internalize this identity, leading to direct realization and liberation (moksha).
The three words 'Tat' (That), 'Tvam' (Thou), and 'Asi' (Art) are analyzed in Advaita Vedanta as indicating the pure consciousness that is the substrate of all existence. According to the Laghu Yoga Vasistha, the repetition of this Mahavakya with contemplation destroys ignorance and reveals the self-luminous Atman. The mantra is traditionally chanted during meditation, often in conjunction with other Mahavakyas such as 'Aham Brahmasmi' (I am Brahman) from the Brihadaranyaka Upanishad and 'So Hum' (I am That).
The recommended practice includes japa (repetition) 108 times daily, preferably at dawn or dusk, in a quiet setting. The practitioner should focus on the meaning rather than mere sound, as the Mantra-Yoga-Samhita emphasizes that the fruit of the mantra arises from understanding its import. No specific cautions are noted, but it is advised to receive initiation (diksha) from a qualified guru to avoid misinterpretation.
The mantra is revered in all schools of Vedanta, especially in the Advaita tradition, and is chanted during spiritual retreats and Vedantic study groups. Its purpose is the dissolution of the ego and the realization of non-duality, leading to liberation while living (jivanmukti).
That thou art.