Does a believer appropriate God's grace gradually as they grow, or is it poured out fully at belief?
All of God's grace is poured out and experienced the moment a person believes; it is not appropriated gradually through spiritual growth. Believers grow in grace from that completed position, not into grace. Salvation brings the full experience of grace, while maturity and spiritual discoveries develop afterward through nurturing and growth.
Les explains that as you study Corinthians, remember these were people saved out of abject paganism, idolatry, and immorality, so they needed a time of nurturing and growth—but only by the grace of God. He notes that infant believers cannot be expected to suddenly be mature or have the same spiritual discoveries as longer, older Christians. The main point is that every person saved by God's grace experiences all of God's grace at salvation. All of God's grace is experienced the moment we believe, even though we have a long way to go in growth. Peter puts it aptly: we grow in grace. We do not grow into grace, and we do not begin to grow and finally appropriate the grace of God. Rather, all of God's grace has been poured out on us the moment we believe, and from that position in grace we grow and grow and grow, if we do as God intends. Les also reminds us that grace is not law; since we are under grace and not under law, nothing is forced upon us—that is the beauty of grace.