If you are new to SRF, you can learn more about Kriya Yoga in Chapter 26 of Autobiography of a Yogi, in which Paramahansa Yogananda describes the history & purpose of Kriya Yoga. You can also read about the Kriya Yoga Path of Meditation on the SRF website. If you have further questions, please call Self-Realization Fellowship at 323-225-2471, and a monastic will be happy to discuss them with you.