Sri Aurobindo
Letters of Sri Aurobindo
Volume III - Part 4
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The essential “I” sense disappears when there is the stable realisation of the one universal Self in all and that remains at all moments in all conditions under any circumstances. Usually this comes first in the Purusha consciousness and the extension to the Prakriti movements is not immediate. But even if there are “I” movements in the Prakriti reactions, the Purusha within observes them as the continued running of an old mechanism and does not feel them as his own. Most Vedantists stop there, because they think
that those reactions will fall away from one at death and all will disappear into the One. But for a change of the nature it is necessary that the experience and seeing of the Purusha should spread to all the parts, mind, vital, physical, subconscient. Then the ego movements of Prakriti can also disappear gradually from one field after another till none is left. For this a perfect samata even in the cells of the body and in every vibration of the being is necessary – samaṃ hi brahma. One is then quite free from it in works also. The individual remains but that is not the small separative ego, but a form and power of the Universal which feels itself one with all beings, an acting centre and instrument of the Universal Transcendent, full of the Ananda of the presence and the action but not thinking or moving independently or acting for its own sake. That cannot be called egoism. The Divine can 
be called an ego only if he is a separate Person limited as in the Christian idea of God by his separateness (though even there esoteric Christianity abolishes the limitation). An I which is not separate in that way is no I at all.
Current publication:
Sri Aurobindo. Letters on Yoga. III // CWSA.- Volume 30. (≈ 22-24 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2014.- 508 p.
Other publications:
Sri Aurobindo. Letters on Yoga // SABCL.- Volume 22. (≈ 28 vol. of CWSA).- Pondicherry: Sri Aurobindo Ashram, 1971.- 502 p.