There’s a movie called “Shadowlands” about the life of C.S. Lewis. At one point, Lewis is told by a friend, "I know how hard you’ve been praying .... Now, God is answering your prayer."
"That’s not why I pray, Harry," Lewis says. "I pray because I can’t help myself. I pray because I’m helpless. I pray because the need flows out of me all the time, waking and sleeping. It doesn’t change God; it changes me."