T H E UPANISHADS TEXTS, TRANSLATIONS AND COMMENTARIES by Sri Aurobido

 The rooted and fundamental conception of Vedanta is that there exists somewhere, could we but find it, available to experience or self-revelation, if denied to intellectual research, a single truth comprehenshie and universal in the light of which the whole of existence would stand revealed and explained both in its nature and its end. This universal existence, for all its multitude of objects and its diversity of forces, is one in substance and origin; and there is an unknown quantity, X or Brahman to which it can be reduced, for from that it started and in and by that it still exists. This unknown quantity is called Brahman.