''Ask and it will be given to you; seek and you will find; knock and the door will be opened to you. For everyone who asks receives; the one who seeks finds; and to the one who knocks, the door will be opened. Which of you, if your son asks for bread, will give him a stone? Or if he asks for a fish, will give him a snake? If you, then, though you are evil, know how to give good gifts to your children, how much more will your Father in heaven give good gifts to those who ask him''

According to these verses, prayer is an opportunity to approach the greatest father of all time and openly express our needs and desires and directly ask for help yet prayer doesn't work, no one has seen a dead person revive or a amputee grow back an arm.