The Mukhya Upanishads: Books of Hidden Wisdom

"The Upanishads ... are among the noblest and most inspired books in the world; in them, the whole of the Indian wisdom is already contained; later teachers could but expand and comment on them, but in no way departed from this original treasure of wisdom." ... "The Upanishads teach the wisdom of Atma, the Supreme Self of all beings; the same divine Life which Philo of Alexandria later called the Logos, the Divine Mind, the collective spiritual consciousness of our universe. They tell us th...