It is stating the obvious to note that when we pray we hope that something happens. We pray, trusting that God will intervene in our lives, give us guidance, bring us healing, change things - we pray hoping that God will act. However, we need to remember that prayer also changes us. The time we spend in the presence of God refines our desires, motives and perspective. If we pray, without expecting something to change within us, then we pray with wrong motives.
"Prayer - secret, fervent, believing prayer - lies at the root of all personal godliness." - William Cary