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.
The animal has its happiness in the senses, the human beings in their intellect, and the gods in spiritual contemplation. It is only to the soul that has attained to this contemplative state that the world really becomes beautiful.
-Swami Vivekananda