These are the collection of the weekly lectures given by the Swami in the Institute of Culture, Calcutta. The introduction to the book is on the power of the Upanishads. Upanishads are intelligible body of verified and verifiable spiritual insights mixed with myths and legends. The book discusses the spiritual heritage of Hindus and various aspects of the Upanishads and Bhagwad Gita. Isa Upanishad and Katha Upanishad have been discussed in great detail, making the book interesting and readable. Stories, quotations , Sanskrit verses , interpretations of the Upanishads are included in t his volume.