The Bible is the divine means of developing spiritual maturity. There is no other way.
You cannot impart what you do not possess.
You can impress from a distance, but you can only impact up close.
You are either in the Word and the Word is conforming you to the image of Jesus Christ, or you are in the world and the world is squeezing you into its mold.
You never graduate from the school of discipleship.
It is a sin to bore a child with the Word of God.