Sri Aurobindo
Letters on Yoga
3. Religion, Morality, Idealism and Yoga
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As for your question – Tagore1, of course, belonged to an age which had faith in its ideas and whose very denials were creative affirmations. That makes an immense difference. Your strictures on his later development may or may not be correct, but this mixture even was the note
of the day and it expressed a tangible hope of a fusion
into something new and true – therefore it could create. Now all that idealism4 has been smashed to pieces by the immense adverse event and everybody is busy exposing its weaknesses
– but nobody knows what to put in its place. A mixture of scepticism and slogans, “Heil-Hitler” and the Fascist salute and the Five-Year-Plan
and the beating of everybody into one amorphous shape, a disabused denial of all ideals on one side and on the other a blind “shut-my-eyes and shut-everybody’s-eyes” plunge into the bog in the hope of finding some firm foundation there
, will not carry us very far. And what else is there? 
Until new spiritual values are discovered, no great enduring
creation is possible.
Current publication:
Sri Aurobindo. Letters on Yoga // SABCL.- Volume 22. (≈ 28 vol. of CWSA).- Pondicherry: Sri Aurobindo Ashram, 1971.- 502 p.
Other publications:
[A letter: ] Sri Aurobindo. Sri Aurobindo to Dilip / edited by Sujata Nahar, Shankar Bandyopadhyay.- 1st ed.- In 4 Volumes.- Volume 2. 1934 – 1935.- Pune: Heri Krishna Mandir Trust; Mysore: Mira Aditi, 2003.- 405 p.
Sri Aurobindo. Letters on Poetry and Art // CWSA.- Volume 27.- Pondicherry: Sri Aurobindo Ashram, 2004.- 769 p.
Sri Aurobindo. On Himself // SABCL.- Volume 26. (≈ 35 vol. of CWSA)
Sri Aurobindo. Letters on Yoga. I // CWSA.- Volume 28. (≈ 22 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2012.- 590 p.
Sri Aurobindo. Letters of Sri Aurobindo: In 4 Series.- Second Series [On Yoga].- Bombay: Sri Aurobindo Sircle, 1949.- 599 p.
Sri Aurobindo. Sri Aurobindo and Mother to Prithwi Singh: Correspondence (1933-1967).- Mysore: Mira Aditi, 1998.- 183 p.