Should new believers be expected to be as spiritually mature as older Christians?

Les teaches that the spiritual life is parallel to the physical. No one is born into the family of God as a full, mature spiritual person; all come into salvation as babes in Christ. Therefore, failures and a time of nurturing and growth are expected, especially for Corinthians saved out of abject paganism, idolatry, and immorality. He illustrates this with an old evangelist who could tell which homes had babies by diapers on the clothesline; likewise, infant believers need growth. We cannot expect them to suddenly be mature or have the same spiritual discoveries as longer and older Christians. All of God's grace is experienced at the moment of belief, but believers still have a long way to go in growth. They grow in grace, not into grace, and since grace is not law, nothing is forced upon them.