But now he has reconciled you by Christ’s physical body through death to present you holy in his sight, without blemish and free from accusation— if you continue in your faith, established and firm, and do not move from the hope held out in the gospel. This is the gospel that you heard and that has been proclaimed to every creature under heaven, and of which I, Paul, have become a servant.– Colossians 1:22-23 (NIV)
We will never outgrow the gospel, for it is the power of God toward salvation. The Bible tells us that we will continually try to perfect ourselves, but our hope is not in our self-efforts. We must constantly come back to the cross if we hope to grow in our faith, for the gospel is not just the way into the Kingdom of God; it is the only way forward.