High Quality Content by WIKIPEDIA articles! Tat Tvam Asi a Sanskrit sentence, translating variously to "Thou art that," "That thou art," "You are that," or "That you are," is one of the Mah?v?kyas (Grand Pronouncements) in Vedantic Hinduism. It originally occurs in the Chandogya Upanishad 6.8.7, in the dialogue between Uddalaka and his son ?vetaketu; 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. The knowledge that this is so characterises the experience of liberation or salvation that accompanies the Unio Mystica.