2014 Reprint of 1924 Edition. Full facsimile of the original edition. Not reproduced with Optical Recognition Software. Yogananda provides a scientific explanation of the use and power of prayer affirmations for health, success and happiness. The book contributes to conscious understanding and application of the laws governing the super-consciousness. Paramhansa Yogananda was an Indian yogi and guru who introduced millions of westerners to the teachings of meditation and Kriya Yoga through his book, "Autobiography of a Yogi."