There in no book in the whole world that is so thrilling, soul-stirring, and inspiring as the Upanishad. The philosophy taught by the Upanishads has been the source of solace for many both in the East and the West. The human intellect has not been able to conceive of anything more noble and sublime in the history of the world than the teachings of the Upanishads. They are rich in profound philosophical thought. They are regarded as the very acme of philosophical thought. Their intrinsic value is very great. There is dept of meaning in the verses. The language is beautiful. The Upanishads have undoubtedly exercised and will continue to exercise a considerable influence on the religions and philosophies of the world. They present a view of reality which could certainly satisfy the scientific, the philosophic, as well as the religious aspirations of man. This book contains the discourses given by Sri Swami Krishnanandaji Maharaj on Isavasya, Kena and Katha Upanishads.