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.
Ref: Letters on Yoga – III