Sri Aurobindo
Letters of Sri Aurobindo
10. Experiences and Realisations
To change the nature is not easy and always takes time, but if there is no inner experience, no gradual emergence of the other purer consciousness that is concealed by all these things you now see, it would be almost impossible even for the strongest will. You 
say that first you must get rid of all these things, then have the inner experiences. But how is that to be done? These things, anger, jealousy, desire are the very stuff of the ordinary human vital consciousness. They could not be changed if there were not a deeper consciousness within which is of quite another character. There is within you a psychic being which is divine, directly a part of the Mother, pure of all these defects. It is covered and concealed by the ordinary consciousness and nature, but when it is unveiled and able to come forward and govern the being, then it changes the ordinary consciousness, throws all these undivine things out and changes the outer nature altogether. That is why we want the sadhaks to concentrate, to open this concealed consciousness – it is by concentration of whatever kind and the experiences it brings that one opens and becomes aware within and the new consciousness and nature begin to grow and come out. Of course we want them also to use their will and reject the desires and wrong movements of the vital, for by doing that the emergence of the true consciousness becomes possible. But rejection alone cannot succeed; it is by rejection and by inner experience and growth that it is done.
You say that all these things were hidden within you. No, they were not deep within, they were in the outer or surface nature, only you were not sufficiently conscious of them because the other true consciousness had not opened and grown within you. Now by the experiences you have had the psychic has been growing and it is because of this new psychic consciousness that you are able to see clearly all that has to go. It does not go at once because the vital had so much the habit of them in the past, but they will now have to go because your soul wants to get rid of them and your soul is growing stronger in you. So you must both use your will aided by the Mother’s force to get rid of these things, and go on with your inner psychic experiences – it is by the two together that all will be done.