Word

Tat_tvam_asi

Sanskrit

तत् त्वम् असि

IAST

tat tvam asi

In General

The Vedic idiom, Tat_tvam_asi is translated as, "Thou art That". Every speaker on Vedanta quote this Upadesha Vakya very frequently as it bestows the vedic secret that what you seek is you yourself. This upadesavaklya given to most ardent seeker of spirituality who crave for Brahmajnana. Guru instructs the disciple that the Self in its original, pure, primordial state is identical with the Ultimate Reality that is the ground and origin of all phenomena. Mirror is worshiped in many temples as deity the idea behind is same, “tat tvam asi”

Veda

V: 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. Chandogya Upanishad is taken as Sama Veda Upanishad