Sri Aurobindo
Letters on Yoga
3. Religion, Morality, Idealism and Yoga
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No, I didn’t say that you chose the rajasic or tamasic Vairagya. I only explained how it came, of itself, as a result of the
movement of the vital in place of the sattwic Vairagya which is supposed to precede and cause or accompany or result from a turning away from the world to seek the Divine. The tamasic Vairagya comes from the recoil of the vital when it feels that it 
has to give up the joy of life and becomes listless and joyless; the rajasic Vairagya comes
when the vital begins to lose the joy of life but complains that it is getting nothing in its place. Nobody chooses such movements; they come independently of the mind as habitual reactions of the human nature. To refuse
these things by detachment, an increasing quiet aspiration, a pure bhakti, an ardent surrender to the Divine, was what I suggested as the true forwarding
movement.
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.- 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 on Yoga. II // CWSA.- Volume 29. (≈ 22-24 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2013.- 522 p.