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.
Be strong! Don't talk of ghosts and devils. We are the living devils. The sign of life is strength and growth. The sign of death is weakness. Whatever is weak, avoid! It is death. If it is strength, go down into hell and get hold of it! There is salvation only for the brave.
-Swami Vivekananda