Asking God for too much?

If you're like me you've wondered if you could possibly ask God for too much. Recently I was rereading one of my favorite books "Channels of Spiritual Power" by Frank Laubach and he shed some light on this.
He said, "We can never ask God for too much. Nothing is impossible to God. Usually we do not ask Him for enough...Our prayers go unanaswered if we ask only to be cured on the surface, while the hidden evil lies deep down inside. God wants the deeep decay removed from our world."
That's what I'm praying for. It sounds too big for me which means it's probably JUST RIGHT for God!