"In short, no prayer of any human being ever uttered in history ever changed the mind of God in the slightest, because His mind doesn't ever need to be changed.
. . . prayer does change things, all kinds of things. But the most important thing it changes is us. As we engage in this communion with God more deeply and come to know the One with whom we are speaking more intimately, that growing knowledge of God reveals to us all the more brilliantly who we are and our need to change in conformity to Him. Prayer changes us profoundly."(R.C. Sproul, The Prayer of the Lord, 14)