This is Yogananda's original 1930 version, which is in the public domain."By the correct practice of Kriya fourteen times, Maha Mudra twice, and Yoti Mudra twice, twelve years of evolution of body, mind and soul will be gained in a few minutes. Yoga is the super-method by which the evolution of body, mind, and soul can be quickened. That is how the attainment of wisdom and realization, which usually takes a million years and numerous incarnations of natural evolution, is possible in one lifetime." - Swami Yogananda, Kriya Yoga.