Zechariah 4:6 So he answered and said to me: “This is the word of the LORD to Zerubbabel: ‘Not by might nor by power, but by My Spirit,‘ Says the LORD of hosts.
Prayer is not what we can do, but what God by His Spirit can do. It is hard sometime to just trust God to work on something by His Spirit without our might and ability. All we have to do is get in touch with Him and keep in communion with Him, then just let Him do the work by His Spirit. He is full of energy and ability and power and might. Its not by our power and ability, its just all Him that answers prayer in His time and by His Spirit.