according to the foreknowledge of God the Father, in sanctification of the Spirit, that you may obey Jesus Christ and be sprinkled in his blood: Grace to you and peace be multiplied.
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.