From Thornton Wilder’s The Angel That Troubled the Waters:

The Newcomer: Oh, in such an hour was I born, and doubly fearful to me is the flaw in my heart. Must I drag my shame, prince and singer, all the days more bowed than my neighbor?
The Angel (Stands a moment in silence): Without your wound, where would your power be? It is your very remorse that makes your low voice tremble in the hearts of men. The very angels themselves cannot persuade the wretched and blundering children on earth as can one human being broken on the wheels of living. In love’s service only the wounded soldiers can serve. Draw back.
[PZ throws his paper off the pulpit]