Prayer begins in us the restoration of the divine image, in all its hiddenness and wonder. It brings us closer to the "region of likeness" and every prayer is an act of letting the old self go. It involves "dying". The grain of wheat falls into the ground and dies. Dead, it is destined to bear much fruit.
We have to be on our guard against wanting to judge for ourselves what point we have reached in the way of pure love. Only God knows this. What we recognize of ourselves, also of our faults and failings, is only the illuminated part of the surface. The deep roots are also hidden from us. God, who knows these, can purify them.