Sri Aurobindo
Letters of Sri Aurobindo
Volume II - Part 3
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In the Tantra the centres are opened and Kundalini is awakened 
by a special process, its action of ascent is felt through the spine. Here it is the
pressure of the Force from above that awakens it and opens the centres. There is an ascension of the consciousness going up till it joins the higher consciousness above. This repeats itself (sometimes a descent also is felt) until all the centres are open and the consciousness rises above the body. At a later stage it remains above and widens out into the cosmic consciousness and the universal Self. This is a usual course, but sometimes the process is more rapid and there is a sudden and definite opening above.
Current publication:
Sri Aurobindo. Letters on Yoga. II // CWSA.- Volume 29. (≈ 22-24 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2013.- 522 p.
Other publications:
Sri Aurobindo. Letters on Yoga // SABCL.- Volume 22. (≈ 28 vol. of CWSA).- Pondicherry: Sri Aurobindo Ashram, 1971.- 502 p.