Kriya Yoga is a meditation technique that quickly accelerates one’s spiritual growth.
Kriya Yoga (क्रिया योग) is described by its practitioners as the ancient Yoga system revived in modern times by Mahavatar Babaji through his disciple Lahiri Mahasaya, followed by Sri Yukteswar and Paramahansa Yogananda, who also brought Kriya to the west and started teaching it after his arrival in the United States in 1920. Yogananda's book "Autobiography of a Yogi" widely increased the awareness and interest in the true teachings of yoga and brought to the large public an art and a science previously reserved to small groups of carefully selected initiates.
Yogananda said that Kriya is the most effective technique available for helping one to reach the goal of Yoga, which means “union with the Divine.” According to him, the ancient Yogic text the Yoga Sutras of Patanjali, contains a description of Kriya Yoga in the second chapter II.49:
"Liberation can be attained by that pranayama which is accomplished by disjoining the course of inspiration and expiration."
The Kriya Yoga system consists of a number of levels of pranayama, mantra, and mudra based on techniques intended to rapidly accelerate spiritual development and engender a profound state of tranquility and God-communion.