Hebrews 12:15, Looking diligently lest any man fail of the grace of God; lest any root of bitterness springing up trouble you, and thereby many be defiled
Disappointment is inevitable in life. This is certainly true in leadership, where managing relationships with people we lead has an increased potential for constantly missed expectations and for hurt. Because of the increased interaction with others, leadership is a setup for pain. Sure, being a leader can also be greatly fulfilling, but it would be foolish to think there are no frustrations on the way to that satisfaction.