Therefore, prepare your minds for action,{Literally, "gird up the loins of your mind"} be sober and set your hope fully on the grace that will be brought to you at the revelation of Jesus Christ--
What is your part? Just believing. You know, God's done all the work. He didn't leave anything as important as the work to someone as weak as you. You'd mess it up. So God did all the work and all that is left for you to do is to believe the work of God.