The formula Om, Tat, Sat, is, it says, the triple definition of the Brahman, by whom the Brahmanas, the Vedas and sacrifices were created of old and in it resides all their significance. Tat, That, indicates the Absolute. Sat indicates the supreme and universal existence in its principle. OM is the symbol of the triple Brahman, the outward-looking, the inward or subtle and the superconscient causal Purusha. Each letter A,U,M indicates one of these three in ascending order and the syllable as a whole brings out the fourth state, Turiya, which rises to the Absolute. OM is the initiating syllable pronounced at the outset as a benedictory prelude and sanction to all act of sacrifice, all act of giving and all act of askesis; it is a reminder that our work should be made an expression of the triple Divine in our inner being and turned towards him in the idea and motive.
ESSAYS ON THE GITA
THE COMPLETE WORKS OF SRI AUROBINDO – VOLUME 19 – THE GUNAS, FAITH AND WORKS
Published by Sri Aurobindo Ashram Publication Department – Pondicherry – India