"true doctrine eliminates arrogance through reflection, because right teaching attacks arrogance in the teacher’s heart. It ensures that the humility it aims to instill in the listeners’ hearts is actually preached by a humble man. For humility, the mother of virtues, teaches by word and demonstrates by example.
The goal of true doctrine is to express humility among disciples more by deeds than by words. When Paul tells his disciples, “These things command and teach with all power” (1 Tim. 4:11), he means the credibility that comes with good behaviour rather than the domineering exercise of power. When one practices first and preaches afterward, one is really teaching with power.”
Gregory the Great (ironic, huh! But I guess that’s what others called him) from Awakening Faith