One big problem with man is that his thoughts far exceed his request. Sometimes, lack of faith makes man to ask for less than he could. For example, you may have it in your thoughts to own an estate but in the place of prayer all you could muster faith to ask God for is a house. Our thoughts include more than we dare to ask in our prayers; our dreams exceed what we consciously desire. God answers prayer; He even answers unspoken prayers. God can act beyond our ability to ask or even imagine.
Why do you limit God in your prayers? There are people in the scriptures that dared ask God seemingly impossible things and He answered them. Can you think of one of them? Who told you that which looks like a mountain before God cannot be handled by Him? No wonder that song writer says, "…oh what peace we often forfeit, oh what needless pains we bear; all because we do not carry EVERYTHING to God in prayers."
God is able to do infinitely more than we would ever dare to ask or hope—more than we would dare to imagine. God is far above and beyond our finite minds. God is able because of his mighty power.