The Principal Upanishads Author:Swami Sivananda There is no book in the whole world that is so thrilling,soul stirring and inspiring as the Upanishads. The philosophy taught by the Upanishads has been the source of solace for many both in east and the west. The Upanishads teach the philosophy of absolute unity.They contain the sublime truth of vedanta and practical hints and clues whic... more »h throw much light on the pathway of self realisation.« less