Sri Aurobindo
Letters of Sri Aurobindo
Volume II - Part 3
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The impressions in the approach to Infinity or the entry into it are not always quite the same; much depends on the way in which the mind approaches it. It is felt first by some as an infinity above, by others as an infinity around into which the mind disappears (as an energy) by losing its limits. Some feel 
not the absorption of the mind energy into the infinite, but a falling entirely inactive; others feel it as a lapse or disappearance of energy into pure Existence. Some first feel the infinity as a vast existence into which all sinks or disappears, others, as you describe it, as an infinite ocean of Light above, others as an infinite ocean of Power above. A
certain school
of Buddhists felt it in their experience as a limitless Sunya, the Vedantists on the contrary see it as a positive Self-Existence featureless and absolute. No doubt the various experiences were erected into various philosophies, each putting its conception as definitive; but behind each conception there was such an experience. What you describe as a completely emptied mind substance devoid of energy or light, completely inert, is the condition of neutral peace and empty stillness which is or can be a stage of the liberation. But it can afterwards feel itself filled with infinite existence, consciousness (carrying energy in it) and finally Ananda.
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.
[Largest or earliest found passage: ] Sri Aurobindo. Letters of Sri Aurobindo: In 4 Series.- First Series [On Yoga].- Bombay: Sri Aurobindo Sircle, 1947.- 416 p.