People may discuss theological doctrines with great skill; but if they lack humility, they will displease God. Intellectual arguments do not make people holy and righteous. I should rather feel repentance in my heart, than define it with my mind. You could know the entire Bible, and be familiar with every exposition written by scholars; but if you lacked the grace and love of God, the knowledge would be useless
~Thomas à Kempis, 1380-1471.
You can download his writings at http://www.ccel.org/ccel/kempis/imitation.all.html.