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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 Mahavakyas
(Grand Pronouncements) in Vedantic Hinduism. It originally occurs
in the Chandogya Upanishad 6.8.7, in the dialogue between Uddalaka
and his son Svetaketu; 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.