According to Yogananda, Kriya Yoga is the most effective technique available to mankind today for reaching the goal of Yoga: union with the Divine. Kriya Yoga is so effective because it works directly with the source of growth — the spiritual energy deep in our spines.
All yoga techniques work with this energy, usually indirectly. Yoga postures, for example, can help open up the spinal channels, and balance the energy in the spine. Yoga breathing exercises or pranayama, can help to awaken that energy.
However, Kriya Yoga is more direct. It helps the practitioner to control the life force by mentally drawing that life force up and down the spine, with awareness and will. According to Yogananda, one Kriya, which takes about a half a minute, is equivalent to one year of natural spiritual growth.
Kriya is also very practical in its effectiveness. Kriya Yogis find that it enhances their ability to concentrate, to become more effective in business and in family life, and to become better people in every way.
How Kriya Yoga Affects the Brain
with Dr. Peter Van Houten, M.D.
The Science of Kriya Yoga
from Autobiography of a Yogi by Paramhansa Yogananda
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. 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.
“One thousand Kriya practiced in eight hours gives the yogi, in one day, the equivalent of one thousand years of natural evolution: 365,000 years of evolution in one year.”Autobiography of a Yogi by Paramhansa Yogananda