Sri Aurobindo
Letters of Sri Aurobindo
Volume II - Part 3
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Chittashuddhi belongs to Rajayoga. In the pure Adwaita the method is rather to detach oneself by vichara and viveka and 
realise “I am not the mind, not the life, etc. etc.” In that case, no shuddhi would be necessary – the self would separate from the nature good or bad and regard it as a machinery which having no more the support of the egoless man
would fall away of itself along with the body. Of course chittashuddhi can be resorted to also, but for cessation of the chittavrittis, not for their better dynamism as an instrument of the Divine. Shankara insists that all karma must fall off before one can be liberated – the soul must realise itself as akartā, there is no salvation
in or by works in the pure Yoga of knowledge. So how could Shankara recognise dynamism? Even if he recognises chittashuddhi as necessary, it must be as a preparation for getting rid of karma, not for anything else.
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.