Sri Aurobindo
Letters on Yoga
5. Planes and Parts of the Being
What you experience is the first condition of the yogic consciousness and self-knowledge. The ordinary mind knows itself only as an ego with all the movements of the nature in a jumble and, identifying itself with these movements, thinks “I am doing this, feeling that, thinking, in joy or in sorrow etc.” The first beginning of real self-knowledge is when you feel yourself separate from the nature in you and its movements and then you see that there are many parts of your being, many personalities each acting on its own behalf and in its own way. The two different beings you feel are – one, the psychic being which draws you 
towards the Mother, the other the external being mostly vital which draws you outward and downwards towards the play of the lower nature. There is also in you behind the mind the being who observes, the witness Purusha, who can stand detached from the play of the nature, observing it and able to choose. It has to put itself always on the side of the psychic being and assent to and support its movement and to reject the downward and outward movement of the lower nature, which has to be subjected to the psychic and changed by its influence.
Current publication:
Sri Aurobindo. Letters on Yoga // SABCL.- Volume 22. (≈ 28 vol. of CWSA).- Pondicherry: Sri Aurobindo Ashram, 1971.- 502 p.
Other publications:
1. 9958.
Sri Aurobindo. Letters on Yoga. I // CWSA.- Volume 28. (≈ 22 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2012.- 590 p.