Sri Aurobindo
Letters of Sri Aurobindo
Volume III - Part 3
The piercing of the veil between the outer consciousness and the inner being is one of the crucial movements in Yoga. For Yoga means union with the Divine, but it also means awaking first to your inner self and then to your higher self,– a movement inward and a movement upward. It is, in fact, only through the awakening and coming to the front of the inner being that you can get into union with the Divine. The outer physical man is only an instrumental personality and by himself he cannot arrive at this union,– he can only get occasional touches, religious feelings, imperfect intimations. And even these come not from the outer consciousness but from what is within us.
There are two mutually complementary movements; in one the inner being comes to the front and impresses its own normal motions on the outer consciousness to which they are unusual and abnormal; the other is to draw back from the outer consciousness, to go inside into the inner planes, enter the world of your inner self and wake in the hidden parts of your being. When that plunge has once been taken, you are marked for the Yogic, the spiritual life and nothing can efface the seal that has been put upon you.
This inward movement takes place in many different ways and there is sometimes a complex experience combining all the signs of the complete plunge. There is a sense of going in or deep down, a feeling of the movement towards inner depths; there is often a stillness, a pleasant numbness, a stiffness of the limbs. This is the sign of the consciousness retiring from the body inwards under the pressure of a force from above,– that 
pressure stabilising the body into an immobile support of the inner life, in a kind of strong and still spontaneous āsana. There is a feeling of waves surging up, mounting to the head, which brings an outer unconsciousness and an inner waking. It is the ascending of the lower consciousness in the Adhara to meet the greater consciousness above. It is a movement analogous to that on which so much stress is laid in the Tantrik process, the awakening of the Kundalini, the Energy coiled up and latent in the body and its mounting through the spinal cord and the centres (cakras) and the Brahmarandhra to meet the Divine above. In our Yoga it is not a specialised process, but a spontaneous uprush of the whole lower consciousness sometimes in currents or waves, sometimes in a less concrete motion, and on the other side a descent of the Divine Consciousness and its Force into the body. This descent is felt as a pouring in of calm and peace, of force and power, of light, of joy and ecstasy, of wideness and freedom and knowledge, of a Divine Being or a Presence – sometimes one of these, sometimes several of them or all together. The movement of ascension has different results: it may liberate the consciousness so that one feels no longer in the body, but above it or else spread in wideness with the body either almost non-existent or only a point in one’s free expanse. It may enable the being or some part of the being to go out from the body and move elsewhere, and this action is usually accompanied by some kind of partial samādhi or else a complete trance. Or it may result in empowering the consciousness, no longer limited by the body and the habits of the external nature, to go within, to enter the inner mental depths, the inner vital, the inner (subtle) physical, the psychic, to become aware of its inmost psychic self or its inner mental, vital and subtle physical being and, it may be, to move and live in the domains, the planes, the worlds that correspond to these parts of the nature. It is the repeated and constant ascent of the lower consciousness that enables the mind, the vital, the physical to come into touch with the higher planes up to the supramental and get impregnated with their light and power and influence. And it is the repeated and constant descent of the Divine Consciousness and its Force 
that is the means for the transformation of the whole being and the whole nature. Once this descent becomes habitual, the Divine Force, the Power of the Mother begins to work, no longer from above only or from behind the veil, but consciously in the Adhara itself, and deals with its difficulties and possibilities and carries on the Yoga.
Last comes the crossing of the border. It is not a falling asleep or a loss of consciousness, for the consciousness is there all the time; only, it shifts from the outer and physical, becomes closed to external things and recedes into the inner psychic and vital part of the being. There it passes through many experiences and of these some can and should be felt in the waking state also; for both movements are necessary, the coming out of the inner being to the front as well as the going in of the consciousness to become aware of the inner self and nature. But for many purposes the ingoing movement is indispensable. Its effect is to break or at least to open and pass the barrier between this outer instrumental consciousness and that inner being which it very partially strives to express, and to make possible in future a conscious awareness of all the endless riches of possibility and experience and new being and new life that lie untapped behind the veil of this small and very blind and limited material personality which men erroneously think to be the whole of themselves. It is the beginning and constant enlarging of this deeper and fuller and richer awareness that is accomplished between the inward plunge and the return from this inner world to the waking state.
The sadhak must understand that these experiences are not mere imaginations or dreams but actual happenings, for even when, as often occurs, they are formations only, of a wrong or misleading or adverse kind, they have still their power as formations and must be understood before they can be rejected and abolished. Each inner experience is perfectly real in its own way, although the values of different experiences differ greatly, but it is real with the reality of the inner self and the inner planes. It is a mistake to think that we live physically only or only with the outer mind and life. We are all the time living and acting on other planes of consciousness, meeting others there and acting upon 
them, and what we do and feel and think there, the forces we gather, the results we prepare have an incalculable importance and effect, unknown to us, upon our outer life. Not all of it comes through, and what comes through takes another form in the physical – though sometimes there is an exact correspondence; but this little is at the basis of our outward existence. All that we become and do and bear in the physical life is prepared behind the veil within us. It is therefore of immense importance for a Yoga which aims at the transformation of life to grow conscious of what goes on within these domains, to be master there and be able to feel, know and deal with the secret forces that determine our destiny and our internal and external growth or decline.
It is equally important for those who want that union with the Divine without which the transformation is impossible. The aspiration could not be realised if you remained bound by your external self, tied to the physical mind and its petty movements. It is not the outer being which is the source of the spiritual urge; the outer being only undergoes the inner drive from behind the veil. It is the inner psychic being in you that is the bhakta, the seeker after the union and the Ananda, and what is impossible for the outer nature left to itself becomes perfectly possible when the barrier is down and the inner self in the front. For the moment this comes strongly to the front or draws the consciousness powerfully into itself, peace, ecstasy, freedom, wideness, the opening to light and a higher knowledge begin to become natural, spontaneous, often immediate in their emergence.
Once the barrier breaks by the one movement or the other, you begin to find that all the processes and movements necessary to the Yoga are within your reach and not as it seems in the outer mind difficult or impossible. The inmost psychic self in you has already in it the Yogin and the bhakta and if it can fully emerge and take the lead, the spiritual turn of your outer life is predestined and inevitable. In the initially successful sadhak it has already built a deep inner life, Yogic and spiritual, which is veiled only because of some strong outward turn the education and past activities have given to the thinking mind and lower 
vital parts. It is precisely to correct this outward orientation and take away the veil that he has to practise more strenuously the Yoga. Once the inner being has manifested strongly whether by the inward-going or the outward-coming movement, it is bound to renew its pressure, to clear the passage and finally come by its kingdom. A beginning of this kind is the indication of what is to happen on a greater scale hereafter.