The Bible is the divine means of developing spiritual maturity. There is no other way.
A good leader has a compass in their head and a magnet in their heart.
The genius of the Word of God is that it has staying power; it can stand up to repeated exposure.
You teach what you know, but you reproduce what you are.
Jesus never discipled one-on-one.
Show me a man's closest companions and I can make a fairly accurate guess as to what sort of man he is, as well as what sort of man he is likely to become.