Kriya Yoga is the union or Yoga with the Infinite through a certain action or rite. The Yogi who faithfully follows the technique is free from Karma and universal chain of causation. Paramhansa Yogananda describes the science of Kriya yoga in his 'Autobiography of a Yogi'.
Kriya Yoga procedure cannot be fully explained theoretically but the science beyond Kriya yoga can be explained. Kriya yoga is a simple, psychophysical method by which the human blood is decarbonized and recharged with oxygen. The atoms of this extra oxygen are transmuted into life current to rejuvenate the brain and the spinal centers. The Yogi is able to lessen or prevent the decay of the tissues by stopping the accumulation of the venous blood. The advanced Yogis have the ability to transmute their cells into pure energy.
Kriya Yoga is an ancient science. Lahiri Mahasaya received the technique from his guru, Babaji, who rediscovered and clarified the techniques of Kriya Yoga. In this technique Yogi is able to neutralize both inhaling breath and outgoing breath. He thus releases the life force from his heart and brings it under his control. The yogi arrests the decay of body by addition of this life force and arrests the mutations or changes of body by 'Apan' or eliminating current. Thus by neutralizing decay and growth and by tranquilizing the heart, the Yogi learns the way of controlling the life.
Patanjali refers a second time to the life-control or Kriya technique thus: "Liberation can be accomplished by that pranayama which is attained by disjoining the course of inspiration and expiration."In the initial state of God- contact or the Saibakalpa Samadhi, the devotee's consciousness merges with the cosmic spirit, his life force is withdrawn from the body and thus the body appears dead or motionless and rigid. The Yogi is full aware of his bodily condition and suspended movement. Then he progresses to the higher spiritual state or the Nirbikalpa Samadhi. However he communes with God without material body and in his ordinary awakening consciousness. The Yogi can achieve this state even in the midst of worldly duties.
Kriya Yoga is an instrument through which human evolution can be quickened. "The ancient yogis discovered that the secret of cosmic consciousness is intimately linked with breath mastery. This is India's unique and deathless contribution to the world's treasury of knowledge. The life force, which is ordinarily absorbed in maintaining the heart-pump, must be freed for higher activities by a method of calming and stilling the ceaseless demands of the breath."
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