Soren Kierkegaard, the father of existentialism, said: "Prayer does not change God, but it changes (the one) who prays."
Some people pray with the idea that if they petition God sincerely and with faith that perhaps he will grant their wish. Others look at prayer as a way to change their own consciousness and awareness and to focus on God and not their problem.
What is prayer to you? Is it a way to change God's mind or yours?