This book is full of useful information, penetrating insights, and profound counsels for all spiritual aspirants. It is something more than an ordinary book. It is a personal contact with a great man, a teacher who has actually experienced what he teaches. An invaluable work indeed for all the seekers of the Supreme Truth.
Anything that is secret and mysterious in these systems of yoga should be at once rejected. The best guide in life is strength. In religion, as in all other matters, discard everything that weakens you, have nothing to do with it.
-Swami Vivekananda