About Tat Tvam Asi

Tat Tvam Asi, a Sanskrit phrase, translated variously as "Thou art that," is one of the Mahāvākyas in Vedantic Sanatana Dharma. It originally occurs in the Chandogya Upanishad 6.8.7, in the dialogue between Uddalaka and his son Śvetaketu; it appears at the end of a section, and is repeated at the end of the subsequent sections as a refrain. The meaning of this saying is that the Self - in its original, pure, primordial state - is wholly or partially identifiable or identical with the Ultimate Reality that is the ground and origin of all phenomena.