Sri Aurobindo
Letters on Yoga
2. Integral Yoga and Other Paths
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The realisation
of the Spirit comes long before the development of overmind or supermind; hundreds of sadhaks in all times have had the realisation of the Atman in
the higher mental planes
, buddheḥ parataḥ, but the supramental realisation was not theirs. One can get partial realisations of the Self or Spirit or the Divine on any plane, mental, vital, physical even, and when one rises above the ordinary mental plane of man into a higher and larger mind, the Self begins to appear in all its conscious wideness.
It is by full entry into this wideness of the Self that cessation of mental activity becomes possible; one gets the inner Silence. After that this inner Silence can remain even when there is activity of any kind; the being remains silent within, the action goes on in the instruments, and one receives all the necessary initiations
and execution of action whether mental, vital or 
physical from a higher source without the fundamental peace and calm of the Spirit being troubled.
The overmind and supermind states are something yet higher than this; but before one can understand them, one must first have the self-realisation, the full action of the spiritualised mind and heart, the psychic awakening, the liberation of the imprisoned consciousness, the purification and entire opening of the Adhar. Do not think now of those ultimate things (overmind, supermind), but get first these foundations in the liberated nature.
Current publication:
Sri Aurobindo. Letters on Yoga // SABCL.- Volume 22. (≈ 28 vol. of CWSA).- Pondicherry: Sri Aurobindo Ashram, 1971.- 502 p.
Other publications:
Sri Aurobindo. Letters on Yoga. II // CWSA.- Volume 29. (≈ 22-24 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2013.- 522 p.
Sri Aurobindo. More Lights on Yoga [: Extracts from letters].– First Edition.– Pondicherry: Sri Aurobindo Ashram, 1948.– 141p.