Sri Aurobindo
Letters on Yoga
6. The Divine and the Hostile Powers
1. Falsehood and Ignorance
Ignorance1 means Avidya, the separative consciousness and the egoistic mind and life that flow from it and all that is natural to the separative consciousness and the egoistic mind and life. This Ignorance is the result of a movement by which the cosmic Intelligence separated itself from the light of the supermind (the divine Gnosis) and lost the Truth,– truth of being, truth of divine consciousness, truth of force and action, truth of Ananda. As a result, instead of a world of integral truth and divine harmony created in the light of the divine Gnosis, we have a world founded on the part truths of an inferior cosmic Intelligence in which all is half-truth, half-error. It is this that some of the ancient thinkers like Shankara, not perceiving the greater Truth-Force behind, stigmatised as Maya and thought to be the highest creative power of the Divine. All in the consciousness of this creation is either limited or else perverted by separation from the integral Light; even the Truth it perceives is only a half-knowledge. Therefore it is called the Ignorance.
Falsehood, on the other hand, is not this Avidya, but an extreme result of it. It is created by an Asuric power which intervenes in this creation and is not only separated from the Truth and therefore limited in knowledge and open to error, but in revolt against the Truth or in the habit of seizing the Truth only to pervert it. This Power, the dark Asuric Shakti or Rakshasic Maya, puts forward its own perverted consciousness as true knowledge and its wilful distortions or reversals of the Truth as the verity of things. It is the powers and personalities of this perverted and perverting consciousness that we call hostile beings, hostile forces. Whenever these perversions created by them out of the stuff of the Ignorance are put forward as the 
Truth of things, that is the Falsehood, in the yogic sense, mithyā, moha.
2. Powers and Appearances
These are the forces and beings that are interested in maintaining the falsehoods they have created in the world of the Ignorance and in putting them forward as the Truth which men must follow. In India they are termed Asuras, Rakshasas, Pishachas (beings respectively of the mentalised vital, middle vital and lower vital planes) who are in opposition to the Gods, the Powers of Light. These too are Powers, for they too have their cosmic field in which they exercise their function and authority and some of them were once divine Powers (the former gods, pūrve devāḥ, as they are called somewhere in the Mahabharata) who have fallen towards the darkness by revolt against the divine Will behind the cosmos. The word “appearances” refers to the forms they take in order to rule the world, forms often false and always incarnating falsehood, sometimes pseudo-divine.
3. Powers and Personalities
The use of the word Power has already been explained – it can be applied to whatever or whoever exercises a conscious power in the cosmic field and has authority over the world-movement or some movement in it. But the Four2 of whom you speak are also Shaktis, manifestations of different powers of the Supreme Consciousness and Force, the Divine Mother, by which she rules or acts in the universe. And they are at the same time divine personalities; for each is a being who manifests different qualities and personal consciousness-forms of the Godhead. All the greater Gods are in this way personalities of the Divine – one Consciousness playing in many personalities, ekam sat bahudhā. Even in the human being there are many personalities and not only one, as used formerly to be imagined; for all consciousness can be at once one and multiple. “Powers and Personalities” simply describe different aspects of the same being; a Power is not necessarily impersonal and certainly it is not avyaktam, as you suggest,– on the contrary, it is a manifestation acting in the worlds of the divine Manifestation.
4. Emanations
Emanations correspond to your description of the Matrikas of whom you speak in your letters. An emanation of the Mother is something of her consciousness and power put forth from her which, so long as it is in play, is held in close connection with her and, when its play is no longer required, is withdrawn back into its source, but can always be put out and brought into play once more. But also the detaining thread of connection can be severed or loosened and that which came forth as an emanation can proceed on its way as an independent divine being with its own play in the world. All the Gods can put forth such emanations from their being, identical with them in essence of consciousness and power though not commensurate. In a certain sense the universe itself can be said to be an emanation from the Supreme. In the consciousness of the sadhak an emanation of the Mother will ordinarily wear the appearance, form and characteristics with which he is familiar.
In a sense the four Powers of the Mother may be called, because of their origin, her Emanations, just as the Gods may be called Emanations of the Divine, but they have a more permanent and fixed character; they are at once independent beings allowed their play by the Adya Shakti and yet portions of the Mother, the Mahashakti, and she can always either manifest through them as separate beings or draw them together as her own various Personalities and hold them in herself, sometimes kept back, sometimes at play, according to her will. In the supramental plane they are always in her and do not act independently but as intimate portions of the supramental Mahashakti and in close union and harmony with each other.
5. Gods
These four Powers are the Mother’s cosmic Godheads, permanent in the world-play; they stand among the greater cosmic Godheads to whom allusion is made when it is said that the Mother as the Mahashakti of this triple world “stands there (in the overmind plane) above the Gods”. The Gods, as has already 
been said, are in origin and essence permanent Emanations of the Divine put forth from the Supreme by the Transcendent Mother, the Adya Shakti; in their cosmic action they are Powers and Personalities of the Divine each with his independent cosmic standing, function and work in the universe. They are not impersonal entities but cosmic Personalities, although they can and do ordinarily veil themselves behind the movement of impersonal forces. But while in the overmind and the triple world they appear as independent beings, they return in the supermind into the One and stand there united in a single harmonious action as multiple personalities of the One Person, the Divine Purushottama.
6. Presence
It is intended by the word Presence to indicate the sense and perception of the Divine as a Being, felt as present in one’s existence and consciousness or in relation with it, without the necessity of any further qualification or description. Thus, of the “ineffable Presence” it can only be said that it is there and nothing more can or need be said about it, although at the same time one knows that all is there, personality and impersonality, Power and Light and Ananda and everything else, and that all these flow from that indescribable Presence. The word may be used sometimes in a less absolute sense, but that is always the fundamental significance,– the essential perception of the essential Presence supporting everything else.
7. The Transcendent Mother
This is what is termed the Adya Shakti; she is the Supreme Consciousness and Power above the universe and it is by her that all the Gods are manifested, and even the supramental Ishwara comes into manifestation through her – the supramental Purushottama of whom the Gods are Powers and Personalities.
Current publication:
Sri Aurobindo. Letters on Yoga // SABCL.- Volume 22. (≈ 28 vol. of CWSA).- Pondicherry: Sri Aurobindo Ashram, 1971.- 502 p.
Other publications:
1. 8386.
Sri Aurobindo. Letters on Himself and the Ashram // CWSA.- Volume 35. (≈ 26 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2011.- 658 p.
2. 10560.
Sri Aurobindo. Letters on Yoga. I // CWSA.- Volume 28. (≈ 22 vol. of SABCL).- Pondicherry: Sri Aurobindo Ashram, 2012.- 590 p.
3. 20682.
Sri Aurobindo. Letters of Sri Aurobindo: In 4 Series.- Second Series [On Yoga].- Bombay: Sri Aurobindo Circle, 1949.- 599 p.
4. 23411.
Sri Aurobindo. On Himself and on the Mother // Sri Aurobindo International University Centre Collection.– Volume 1.– First Edition.– Pondicherry: Sri Aurobindo Ashram, 1953.– 782 p.
5. 23412.
Sri Aurobindo. On Himself and on the Mother // Sri Aurobindo International University Centre Collection.– Volume 1.– First Edition.– Pondicherry: Sri Aurobindo Ashram, 1953.– 782 p.
6. 23413.
Sri Aurobindo. On Himself and on the Mother // Sri Aurobindo International University Centre Collection.– Volume 1.– First Edition.– Pondicherry: Sri Aurobindo Ashram, 1953.– 782 p.
7. 23956.
Sri Aurobindo. The Mother // SABCL.- Volume 25. (≈ 32 vol. of CWSA) The Mother with Letters on the Mother and Translations of Prayers and Meditations.– Popular Edition.– Pondicherry: Sri Aurobindo Ashram, 1972.– 496 p.