The term Upanishad has been translated in many ways, "sitting near devotedly", "secret teachings", and the more elaborate, "knowledge of God." It is the knowledge of God that truly captures the essence of the Upanishads.
The 7th century scholar, Shankara, describes the Upanishads as "the knowledge of Brahman, the knowledge that destroys the bond of ignorance and leads to the supreme goal of freedom." Each Upanishad illustrates the path towards discovering this inner knowledge, thus achieving escape from samsara, or this world of suffering.
This translation contains the twelve standard Upanishads, including one of the most famous, the Brihad-aranyaka, which is the oldest and largest of these ancient scriptures.
This work embodies the mystical and esoteric aspects of ancient Hindu philosophy, and serves as an interesting and enlightening guide to knowledge of Self.