This book consists of spiritual teachings and practices based on Vedanta. Equally useful for beginners as well as advanced aspirants, the book does shed shafts of light, dispelling the darkness of ignorance from the reader's heart. For a beginner, the book is a path-breaker; for an advanced aspirant, reassuring and strengthening; and for one already established in the goal, well, it should be a sheer delight. The book will benefit aspirants at any level, since it deals with Self-knowledge and the means to attain it.
Change is always subjective. All through evolution you find that the conquest of nature comes by change in the subject. Apply this to religion and morality, and you will find that the conquest of evil comes by the change in the subjective alone. That is how the Advaitic system gets its whole force, on the subjective side of man.
-Swami Vivekananda