Tat Tvam Asi (Sanskrit: तत् त्वम् असि or तत्त्वमसि), a Sanskrit sentence, translating variously to "Thou art that," "That thou art," or "You are that," is one of the Mahāvākyas (Grand Pronouncements) in Vedantic Hinduism. It originally occurs in the Chandogya Upanishad 6.8.7, in the dialogue between Uddālaka 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 - 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.