Sri Aurobindo
Letters on Yoga
2. Integral Yoga and Other Paths
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I think Ramatirtha’s realisations were more mental than anything else. He had opening of the higher mind and a realisation there of the cosmic Self, but I find no evidence of a transformed mind and vital; that transformation is not a result or
object of the Yoga of Knowledge. The realisation of the Yoga of Knowledge is when one feels that one lives in the wideness of something silent, featureless and universal (called the Self) and all else is seen as only forms and names; the Self is real, nothing else. The realisation of “my self in other forms” is a part of this or a step towards it, but in the full realisation the “my” should drop so that there is only the one Self or rather only the Brahman. For the Self is merely a subjective aspect of the Brahman, just as the Ishwara is its objective aspect. That is the Vedantic “Knowledge”. Its result is peace, silence, liberation. As for the active Prakriti, (mind, vital, body,) that
Yoga of Knowledge does not make it its aim to transform them – that would be no use as the idea is that if the liberation has come, it will all drop off at death. 
The only change wanted is to get rid of the idea of ego and realise as true only the supreme Self, the Brahman.
Current publication:
Sri Aurobindo. Letters on Yoga // SABCL.- Volume 22. (≈ 28 vol. of CWSA).- Pondicherry: Sri Aurobindo Ashram, 1971.- 502 p.
Other publications:
[Largest or earliest found passage: ] Sri Aurobindo. Letters on Himself and the Ashram // CWSA.- Volume 35. (≈ 26 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2011.- 658 p.
Sri Aurobindo. Letters on Yoga. II // CWSA.- Volume 29. (≈ 22-24 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2013.- 522 p.