The following is from a talk by the Mother of the Sri Aurobindo Ashram, Mirra Alfassa, dated 22 June 1955 ( complete talk here). Here she makes some very interesting comments regarding the appearance of the chakras in meditation and so on. This is also related to the concept of the "mental fortress", the idea that we create a subjective mental image of Reality, which we mistake for Reality itself.
How can one awaken his Yogashakti?It depends on this: when one thinks that it is the most important thing in his life. That's all.
Some people sit in meditation, concentrate on the base of the vertebral column and want it very much to awake, but that's not enough. It is when truly it becomes the most important thing in one's life, when all the rest seems to have lost all taste, all interest, all importance, when one feels within that one is born for this, that one is here upon earth for this, and that it is the only thing that truly counts, then that's enough.
One can concentrate on the different centres; but sometimes one concentrates for so long, with so much effort, and has no result. And then one day something shakes you, you feel that you are going to lose your footing, you have to cling on to something; then you cling within yourself to the idea of union with the Divine, the idea of the divine Presence, the idea of the transformation of the consciousness, and you aspire, you want, you try to organise your feelings, movements, impulses around this. And it comes.
Some people have recommended all kinds of methods; probably these were methods which had succeeded in their case; but to tell the truth, one must find one's own method, it is only after having done the thing that one knows how it should be done, not before.
If one knows it beforehand, one makes a mental construction and risks greatly living in his mental construction, which is an illusion; because when the mind builds certain conditions and then they are realised, there are many chances of there being mostly pure mental construction which is not the experience itself but its image. So for all these truly spiritual experiences I think it is wiser to have them before knowing them. If one knows them, one imitates them, one doesn't have them, one imagines oneself having them; whereas if one knows nothing - how things are and how they ought to happen, what should happen and how it will come about - if one knows nothing about all this, then by keeping very still and making a kind of inner sorting out within one's being, one can suddenly have the experience, and then later knows what one has had. It is over, and one knows how it has to be done when one has done it - afterwards. Like that it is sure.
One may obviously make use of his imagination, imagine the Kundalini and try to pull it upwards. But one can also tell himself tales like this. I have had so many instances of people who described their experiences to me exactly as they are described in books, knowing all the words and putting down all the details, and then I asked them just a little question like that, casually: that if they had had the experience they should have known or felt a certain thing, and as this was not in the books, they could not answer.
Sweet Mother, what is the significance of the thousand-petalled lotus?That is how they describe it. It is because there's a centre there, very, very complicated. I think it means the countless powers of thought, it is the multiplicity of knowledge in all its forms. It must be that. Why, this is still another instance: people who have read, studied, and have the experience afterwards, well, they always describe it like that, with names they have picked up in books and with descriptions of the lotuses as they are given in books; but those who have the spontaneous experience without having read or learnt anything before having it, they describe it altogether vividly, with an individual reality, so to say. Each one approaches the experience in his own way. When these centres awake... it is a fact that there are centres, and it's a fact that they awake, and it's a fact that this changes vastly the whole working of the consciousness and energy, but the description, if it is spontaneous and sincere, is different for everyone. One can have the feeling of a similarity with something, but giving a fixed and precise description of what happens is always an intervention of the mind.
This phenomenon is very real, concrete, it is felt with all the reality and intensity of even a physical phenomenon. But each person describes it with a form particular to himself, except as I say, when he has read and studied, and his brain is full of all that is written in books; then automatically what he has read gives a form to his experience, and this takes away from it something of the spontaneity which gives such an impression of being sincere and truthful; it becomes a mental construction. If you have read and read much that it is like a serpent which is coiled up, well, quite naturally when you concentrate and try to awaken it, you see a serpent which is coiled, because you think about it like that. If you are told about a thousand-petalled lotus, you see a thousand-petalled lotus. But it is a mental superimposition upon the fact of the experience itself. But the feeling of something that's innumerable, that's one and innumerable at the same time, and that kind of impression of something opening, awakening, beginning to vibrate, responding to the forces and giving you an intensity of light, of understanding, of opening to higher regions, this is... the substance of the experience. Yet when you begin to describe it with images which you have found in books, it is as though suddenly you were making it either superficial - fossilised, so to say - or artificial or even insincere.
Always the most interesting cases for me have been those of people who had read nothing but had a very ardent aspiration and came to me saying, "Something funny has happened to me, I had this extraordinary experience, what can it mean truly?" And then they describe a movement, a vibration, a force, a light, whatever it might be, it depends on each one, and they describe this, that it happened like that and came like that, and then this happened and then that, and what does it all mean, all this? Then here one is on the right side. One knows that it is not an imagined experience, that it is a sincere, spontaneous one, and this always has a power of transformation much greater than the experience that was brought about by a mental knowledge.
Collected Works Of The Mother - Centenary Edition, Volume 7, Questions And Answers 1955, pp.211-214