[A] failure to recognize and trust that the sin issue between you and God is over will effectively stop your spiritual growth in Christ. It’s really not complicated. The process of spiritual maturity is simply our learning to turn more and more areas of our lives over to Christ through faith. The past is over; the future isn’t here yet. Therefore, living by faith can only be done in the present.
Quoted from George, B. (1989). Classic Christianity. Eugene, Or: Harvest House, p. 58.