Swami Vivekananda's illuminative ideas on religion are spread over nearly 4200 pages of his Complete Works. This book containing eight lectures is a compilation from the same and serves as a small introduction to his voluminous writings, talks, and lectures on the subject.
Are you unselfish? That is the question. If you are, you will be perfect without reading a single religious book, without going into a single church or temple.
-Swami Vivekananda