I think that some of the greatest prayer is prayer where you don't say one single word or ask for anything. Now God does answer and He does give us what we ask for. That's plain; nobody can deny that unless he denies the Scriptures. But that's only one aspect of prayer, and it's not even the important aspect. Sometimes I go to God and say, "God, if Thou dost never answer another prayer while I live on this earth I will still worship Thee as long as I live and in the ages to come for what Thou hast done already." God's already put me so far in debt that if I were to live one million millenniums I couldn't pay Him for what He's done for me.
We go to God as we send a boy to a grocery store with a long written list, "God, give me this, give me this, and give me this," and our gracious God often does give us what we want. But I think God is disappointed because we make Him to be no more than a source of what we want. Even our Lord Jesus is presented too often much as "Someone who will meet your need." That's the throbbing heart of modern evangelism. You're in need and Jesus will meet your need. He's the Need-meeter. Well, He is that indeed; but, ah, He's infinitely more than that.
A.W. Tozer in Worship: The Missing Jewel, pp. 24-25