Try it, even though you've tried it before. There are sometimes that we try something and do not find success, is because God is not in it. Ask God for a miracle. God is not required to heal. It is not always God's will for one to be healed. Peter was always getting himself in trouble. He rebuked Jesus, and Jesus said, "Get thee behind me satan." Peter couldn't keep his mouth shut. He wanted to build a tabernacle for God, Elias, and Moses ... God spoke from the Heavens, and stopped him. Peter cut off the ear of a soldier. God still used Peter. He was one of the main two, used by God in the formation of the early New Testament church.