Om Tat Sat/ Chapters 17:23-27 of the Bhagavad Gita (Song of God) From the beginning of creation, the three syllables "OM" "TAT "SAT" have been used to indicate the Supreme Absolute Truth (Brahman). They were uttered by brahmanas while chanting vedic hymns and during sacrifices, for the satisfaction of the supreme. Thus the transcendentalists undertake sacrifices, charities and penances, beginning always with "OM", to attain the Supreme. One should perform sacrifice, penance and charity with the word "TAT". The purpose of such transcendental activities is to get free from the material entanglement. The Absolute Truth is the objective of devotional sacrifice, and it is indicated by the word "SAT". These words of sacrifice, of penance and of charity, true to the absolute nature, are performed to please the Supreme, O son of Prtha. "