Sri Aurobindo
Letters on Yoga
5. Planes and Parts of the Being
If we regard the gradation of worlds or planes as a whole, we see them as a great connected complex movement; the higher precipitate their influences on the lower, the lower react to the higher and develop or manifest in themselves within their own formula something that corresponds to the superior power and its action. The material world has evolved life in obedience to a pressure from the vital plane, mind in obedience to a pressure 
from the mental plane. It is now trying to evolve supermind in obedience to a pressure from the supramental plane. In more detail, particular forces, movements, powers, beings of a higher world can throw themselves on the lower to establish appropriate and corresponding forms which will connect them with the material domain and, as it were, reproduce or project their action here. And each thing created here has, supporting it, subtler envelopes or forms of itself which make it subsist and connect it with forces acting from above. Man, for instance, has, besides his gross physical body, subtler sheaths or bodies by which he lives behind the veil in direct connection with supraphysical planes of consciousness and can be influenced by their powers, movements and beings. What takes place in life has always behind it pre-existent movements and forms in the occult vital planes; what takes place in mind presupposes pre-existent movements and forms in the occult mental planes. That is an aspect of things which becomes more and more evident, insistent and important, the more we progress in a dynamic yoga.
But all this must not be taken in too rigid and mechanical a sense. It is an immense plastic movement full of the play of possibilities and must be seized by a flexible and subtle tact or sense in the seeing consciousness. It cannot be reduced to a too rigorous logical or mathematical formula. Two or three points must be pressed in order that this plasticity may not be lost to our view.
First, each plane, in spite of its connection with others above and below it, is yet a world in itself, with its own movements, forces, beings, types, forms existing as if for its and their own sake, under its own laws, for its own manifestation without apparent regard for the other members of the great series. Thus, if we regard the vital or the subtle physical plane, we see great ranges of it, (most of it), existing in themselves, without any relation with the material world and with no movement to affect or influence it, still less to precipitate a corresponding manifestation in the physical formula. At most we can say that the existence of anything in the vital, subtle physical or any other plane creates a possibility for a corresponding movement of manifestation in the physical world. But something more is needed to turn that 
static or latent possibility into a dynamic potentiality or an actual urge towards a material creation. That something may be a call from the material plane, e.g., some force or someone on the physical existence entering into touch with a supraphysical power or world or part of it and moved to bring it down into the earth-life. Or it may be an impulse in the vital or other plane itself, e.g., a vital being moved to extend his action towards the earth and establish there a kingdom for himself or the play of the forces for which he stands in his own domain. Or it may be a pressure from above; let us say, some supramental or mental power precipitating its formation from above and developing forms and movements on the vital level as a means of transit to its self-creation in the material world. Or it may be all these things acting together, in which case there is the greatest possibility of an effective creation.
Next, as a consequence, it follows that only a limited part of the action of the vital or other higher plane is concerned with the earth-existence. But even this creates a mass of possibilities which is far greater than the earth can at one time manifest or contain in its own less plastic formulas. All these possibilities do not realise themselves; some fail altogether and leave at the most an idea that comes to nothing; some try seriously and are repelled and defeated and, even if in action for a time, come to nothing. Others effectuate a half manifestation, and this is the most usual result, the more so as these vital or other supraphysical forces come into conflict and have not only to overcome the resistance of the physical consciousness and of matter, but their own internecine resistance to each other. A certain number succeed in precipitating their results in a more complete and successful creation, so that if you compare this creation with its original in the higher plane, there is something like a close resemblance or even an apparently exact reproduction or translation from the supraphysical to the physical formula. And yet even there the exactness is only apparent; the very fact of translation into another substance and another rhythm of manifestation makes a difference. It is something new that has manifested and it is that that makes the creation worth while. What for instance would be the utility of a supramental creation on earth if it were just the same thing as a supramental creation on the supramental plane? It is that, in principle, but yet something else, a triumphant new self-discovery of the Divine in conditions that are not elsewhere.
No doubt, the subtle physical is closest to the physical, and most like it. But yet the conditions are different and the thing too different. For instance, the subtle physical has a freedom, plasticity, intensity, power, colour, wide and manifold play (there are thousands of things there that are not here) of which, as yet, we have no possibility on earth. And yet there is something here, a potentiality of the Divine which the other, in spite of its greater liberties, has not, something which makes creation more difficult, but in the last result justifies the labour.
Current publication:
Sri Aurobindo. Letters on Yoga // SABCL.- Volume 22. (≈ 28 vol. of CWSA).- Pondicherry: Sri Aurobindo Ashram, 1971.- 502 p.
Other publications:
1. 9978.
Sri Aurobindo. Letters on Yoga. I // CWSA.- Volume 28. (≈ 22 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2012.- 590 p.
2. 20361.
[Largest or earliest found passage: ]Sri Aurobindo. The Riddle of this World: Letters.- Pondicherry: Sri Aurobindo Ashram, 1973.- 72 p.