Kriya
"Course the breath in ways appropriate Through nadis, Idakala and Pingala Seat yourself in asanas comely, And agreeably direct the breath within; Through muladhara that is triangle shaped Upward ascend; verily may you see the feet of the Lord That is timeless eternity."
Thirumandiram V 2173
The advanced forms of Kriya Kundalini Pranayam, make use of the chakras and primary lateral meridians, ida and pingala nadis. Yogananda, in his autobiography, narrates a similar process in the practice of kundalini Yoga..."The Kriya yogi mentally directs his life energy to revolve upward and downward, around the six spinal centers which (bifurcated by the central nadi) correspond to the twelve signs of the zodiac, the symbolic cosmic man. One-half minute of revolution of energy around the sensitive spinal cord of man affects subtle progress in his evolution; that half minute of Kriya equals one year of natural spiritual growth."
Sir John Woodroffe refers to the technique in his Introduction to Tantra Shasta; "Details of the practice can only be learned from a guru, but generally it may be said that jivatma...is united with the kulakundalini by giving a left-ward revolution (beginning with ida nadi) and the fire which is around kundalini is kindled."
The Shandilyo Upanishad states that when the nadis are purified the prana enters shushumna with a force and the mind becomes still.
"Uprooting the gunas three; He who controls breath in muladhara And courses it alternately Through nadi left and right in time measure prescribed Will be immortal made by Him that is king of beings Heavenly."
Thirumandiram V 615
