"No system of thought or body control is more widely known today than Yoga. When a religious method recommends itself as ’scientific’, it can be certain of its public in the West. Yoga fulfills this expectation. Quite apart from the charm of the new and the fascination of the half-understood, there is good cause for Yoga to have many adherents. It offers the possibility of controllable experience and thus satisfies the scientific need for ’facts’; and, besides this, by reason of its breadth and depth, its venerable age, its doctrine and method which include every phase of life, it promises undreamed-of possibilities."