The Inheritor - Pg 139

   "I don't know," Leslie said again, while with one detached part of her mind she wondered why she was saying this; but she had never been so sure of anything in her life. "How do we know how things would look from the perspective of more lives than one? It's possible that for some reason you felt you needed to learn compassion for the handicapped; perhaps you felt you had been insensitive to the needs of someone. Or perhaps Chrissy, for some reason, felt that she needed to learn the lesson of being something other than perfect—a lesson of humility, perhaps, or of helplessness—and she came to you because you were the right parent."