Sri Aurobindo
Letters of Sri Aurobindo
Volume II - Part 3
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The feeling of the Self as a vast peaceful Void, a liberation from 
existence as we know it, is one that one can always have, Buddhist or no Buddhist. It is the negative aspect of Nirvana – it is quite natural for the mind, if it follows the negative movement of withdrawal, to get that first, and if you lay hold on that and refuse to go farther, being satisfied with this liberated Non-Existence, then you will naturally philosophise like the Buddhists that Sunya is the eternal truth. Lao Tse was
more perspicacious when he spoke of it as the Nothing that is All. Many of course have the positive experience of the Atman first, not as a void but as pure unrelated Existence like the Adwaitins (Shankara) or as the one Existent.
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.