The prayer of a righteous man is powerful and effective. Usually this happens because an address is wrong or the recipient changed his or her address. A message you thought was getting through didn't go anywhere. That can happen, you know. We can pray in such a way or pray with such a spirit that our prayer doesn't get through.
Prayer is a great and awesome privilege.
It allows you to talk directly with the Almighty God of the universe. Take advantage of it. Avoid the prayer blocks. For a copy of Jesus' Blueprint for Prayer, write RBC Ministries, Dept. CJ, Grand Rapids, MI 49555.