A handicapped child, even if it is only one among a thousand healthy ones, has its own life to live, as a unique being, alongside that of its parents and its brothers and sisters. Why does God "allow this"? Let us beware of "glib" answers. Where the question "Why?" is concerned, only the response of solidarity can convince anyone. I, too, might have been this handicapped child. It has the same human existence and the same dignity as I do. It is a living challenge to me: Be the kind of person to me that you would wish for if you were in my place. How much love has come into the world by this painful means!
--Chirstoph Cardinal Schonborn, Chance or Purpose?: Creation, Evolution, and a Rational Faith (102-103)