Sri Aurobindo
Letters of Sri Aurobindo
Volume II - Part 3
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It happens that people may get the descent without noticing that it is a descent because they feel the result only. The ordinary Yoga does not go beyond the spiritual mind – people feel at the top of the head the joining with the Brahman, but they are not aware of a consciousness above the head. In the same way in the ordinary Yoga one feels the ascent of the awakened inner
consciousness (Kundalini) to the brahmarandhra where the Prakriti joins the Brahman-consciousness, but they do not feel the descent. Some may have had these things, but I don’t know that they understood their nature, principle or place in a complete sadhana. At least I never heard of these things from others before I found them out in my own experience. The reason is that the old Yogins when they went above the spiritual mind passed into samadhi, which means that they did not
attempt to be conscious in these higher planes – their aim being to pass away into the 
Superconscient and not to bring the Superconscient into the waking consciousness, which is that of my Yoga.
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.
Sri Aurobindo. On Himself // SABCL.- Volume 26. (≈ 35 vol. of CWSA)
[Largest or earliest found passage: ] Sri Aurobindo. Letters on Himself and the Ashram // CWSA.- Volume 35. (≈ 26 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2011.- 658 p.