If I gave you a shovel and told you there was an abundance of treasure just below your feet, would you help yourself to it? Would you keep digging until you had it? Prayer is such a clear operation of faith. You keep pulling on Jesus' shirt sleeve so to speak. Which in fact acknowledges by this action, that we know He's the only one who can meet our need!
It is finished in Heaven. But from down here we must look up and reach, through prayer, to yank the finished product of the answer down to us so that it may be "on earth as it is in heaven."
Eric's message vividly brings to the listener an important concept on prayer, using a grappling hook for analogy, Impossible-For-God-Not-To-Answer prayer recipe, and the account of the friends bringing the man with palsy through the roof to Jesus.