Sri Aurobindo
Letters of Sri Aurobindo
Volume II - Part 3
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I don’t think I have written, but I said once that souls which have passed into Nirvana may (not “must”) return to complete the larger upward curve. I have written somewhere, I think, that for this Yoga (it might also be added, in the natural complete order of the manifestation) the experience of Nirvana can only be a stage or passage to the complete realisation. I have said also that there are many doors by which one can pass into the 
realisation of the Absolute (Parabrahman) and Nirvana is one of them, but by no means the only one. You may remember Ramakrishna’s saying that the Jivakoti can ascend the stairs, but not return, while the Ishwarakoti can ascend and descend at will. If that is so, the Jivakoti might be those who describe only the curve from Matter through Mind into the silent Brahman and the Ishwarakoti those who get to the
integral Reality and can therefore combine the Ascent with the Descent and contain the “two ends” of existence in their single being.
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.
[A letter: ] Sri Aurobindo. Sri Aurobindo to Dilip.- 1st ed.- In 4 Volumes.- Volume 4. 1938 – 1950 / edited by Shankar Bandopadhyay.- Pune: Heri Krishna Mandir Trust; Mysore: Mira Aditi, 2003.- 269 p.
Sri Aurobindo. Letters of Sri Aurobindo: In 4 Series.- Second Series [On Yoga].- Bombay: Sri Aurobindo Sircle, 1949.- 599 p.