Cooperation with God
When we continually pray and worship God, then our main desire is doing the will of God. Many prayers remain unanswered by God, because these prayers have a wrong foundation and demonstrate wrong priorities. For example, you may pray for a person with some serious problems. And you ask God to remove his or her problems or to solve them. At the same time you know that even if the answer to this prayer comes, the problems might return, since the cause of them has not been removed. That is why when Paul prayed he always asked for the people to learn the will of God and have a desire to do His will and be fruitful.