A minister, by nature of the office, is in a position of power. Far too often, that power is abused and the minister no longer approaches the calling with humility. Edmund Clowney, former professor at Westminster Theological Seminary in Philadelphia, offers these helpful words in his book, Called to the Ministry:

A minister is a servant; Christ is the one Lord, who must rule until all his enemies are put under his feet (1 Cor 15:25, Col. 3:1). No one is called to lord it over the flock of Christ (1 Pet. 5:3); no throne is set in the church but the one at God's right hand.

That last line is absolutely key.