Synopsis This volume contains its author’s lectures at the Ramakrishna Mission Institute of Culture in his capacity as the Institute’s Vivekananda professor of Indology and Idological Research. The author deals with swami Vivekanada’s approach to four of our six systems of philosophy and his observations are based on Swamiji’s references to them available in the eight volumes of his Completed Works. As a supplement to this material the author deals with Swami Vivekananda’s approach to the Upanishads and the Bhagavad-Gita. Swami Vivekananda’s ideas of comparative religion, his response to Western Indology, Western philosophy and his view of history are here discussed perhaps for the first time in some detail. The tenth chapter deals with swami Vivekananda and his Master Sri Ramakrishna to show that Swamiji interpreted Vedanta in terms of the teachings of Sri Ramakrishna who was to him Vedanta’s in terms of the teachings of Sri Ramakrishna who was to him Vedanta’s greatest human examplar. The twelfth chapter deals with a theme on which a great deal has been written. The author has tried to define Swami Vivekananda’s idea of universal religion with reference to his observations on it as available in his Complete Works.