Q: What inner work is done through prayer?
A: A prayer is the request of the lower one for correction, and ascent of the desire to be corrected from the lower to the Upper Partzuf (raising MAN). If the lower one knows what to ask for, knows exactly what it wants, what it wants to be (meaning that inside there is already a sufficiently tormented desire, and only that desire), at that point the Upper One responds and the lower one rises.
This process involves all the worlds, Partzufim and Sefirot from our world (the situation we are in right now) through the world of Ein Sof (infinity; the situation you cannot feel), although you are just as much in it as in our world. This is the total completeness, attainment and satisfaction.