Sri Aurobindo
Letters on Yoga
2. Integral Yoga and Other Paths
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I never heard of silence descending in other yogas – the mind goes into silence. Since however I have been writing of ascent and descent, I have been told from several quarters that there is nothing new in this yoga – so I am wondering whether people were not getting ascents and descents without knowing it! or at least without noticing the process. It is like the rising above the head and taking the station there – which I and others have experienced in this yoga. When I spoke of it first, people stared 
and thought I was talking nonsense. Wideness must have been felt in the old yogas because otherwise one could not feel the universe in oneself or be free from the body consciousness or unite with the Anantam Brahman. But generally as in Tantric yoga one speaks
of the consciousness rising to the Brahmarandhra, top of the head, as the summit. Rajayoga of course lays stress on Samadhi as the means of the highest experience. But obviously if one has not the Brāhmīsthiti in the waking state, there is no completeness in the realisation. The Gita distinctly speaks of being samāhita (which is equivalent to being in Samadhi) and the Brāhmīsthiti as a waking state in which one lives and does all actions.
Current publication:
Sri Aurobindo. Letters on Yoga // SABCL.- Volume 22. (≈ 28 vol. of CWSA).- Pondicherry: Sri Aurobindo Ashram, 1971.- 502 p.
Other publications:
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.
Sri Aurobindo. Letters on Yoga. II // CWSA.- Volume 29. (≈ 22-24 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2013.- 522 p.
Sri Aurobindo. On Himself and on the Mother // Sri Aurobindo International University Centre Collection.– Volume 1.– First Edition.– Pondicherry: Sri Aurobindo Ashram, 1953.– 782 p.