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.
All is the Self or Brahman. The saint, the sinner, the lamb, the tiger, even the murderer, as far as they have any reality, can be nothing else, because there is nothing else.
-Swami Vivekananda