The Self, who is to be realized by the purified mind and the illuminated consciousness, whose form is light, whose thoughts are true; who like the ether, remains pure and unattached; from whom proceed all works, all desires, all odors, all tastes; who pervades all, who is beyond the senses, and in whom there is fullness of joy forever - he is my very Self, dwelling within the lotus of my heart. - Chandogya Upanishad