Sri Aurobindo
Letters on Yoga
5. Planes and Parts of the Being
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It all depends upon where the consciousness places itself and concentrates
itself. If the consciousness places or concentrates
itself within the ego, you are identified with the ego – if in the mind, it is identified with the mind and its activities and so on. If the consciousness puts its stress outside, it is said to live in the external being and becomes oblivious of its inner mind and vital 
and inmost psychic; if it goes inside, puts its centralising stress there, then it knows itself as the inner being or, still deeper, as the psychic being; if it ascends out of the body to the planes where self is naturally conscious of its wideness and freedom it knows itself as the Self and not the mind, life or body. It is this stress of consciousness that makes all the difference. That is why one has to concentrate the consciousness in heart or mind in order to go within or go above. It is the disposition of the consciousness that determines everything, makes one predominantly mental, vital, physical or psychic, bound or free, separate in the Purusha or involved in the Prakriti.
Current publication:
Sri Aurobindo. Letters on Yoga // SABCL.- Volume 22. (≈ 28 vol. of CWSA).- Pondicherry: Sri Aurobindo Ashram, 1971.- 502 p.
Other publications:
1. 9729.
Sri Aurobindo. Letters on Yoga. I // CWSA.- Volume 28. (≈ 22 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2012.- 590 p.