"Except ye see signs and wonders, ye will not believe."-John 4:48. The value of Yogananda's Autobiography is greatly enhanced by the fact that it is one of the few books in English about the wise men of India which has been written, not by a journalist or foreigner, but by one of their own race and training-in short, a book about yogis by a yogi. As an eyewitness recountal of the extraordinary lives and powers of modern Hindu saints, the book has importance both timely and timeless. To its illustrious author, whom I have had the pleasure of knowing both in India and America, may every reader render due appreciation and gratitude. His unusual life-document is certainly one of the most revealing of the depths of the Hindu mind and heart, and of the spiritual wealth of India, ever to be published in the West. It has been my privilege to have met one of the sages whose life- history is herein narrated-Sri Yukteswar Giri. A likeness of the venerable saint appeared as part of the frontispiece of my Tibetan Yoga and Secret Doctrines.