Because leadership, if you're doing it for other people's good and not just to ring your own chimes, is tough stuff. True leadership is not always fun. Sometimes, as in war, you have to go where you'd rather not go. Leaders get shot at - sometimes with bullets, often with words. God takes pleasure in the leader who holds true to his or her deepest values, because that's why God put that gift within you.
Exhortation is a funny word.
We don't use it much. It may sound like talking somebody into something. There's a better translation - encouragement. You know what encouragement is. Maybe you can remember someone who encouraged you.