Don't say I never quote Lewis. It's true I prefer Chesterton, but here's a great Lewis line forwarded by a dear friend just now:
Every disability conceals a vocation.
Actually, it's a phrase from the middle of a letter he wrote to Sheldon Vanauken quoted in Vanauken's A Severe Mercy, so the capital "E" and period should both be an ellipsis, technically speaking.
In this particular case, Lewis is speaking of the handicap of being homosexually tempted. Christians don't speak of homosexual or same-sex "attraction" or "desire," but rather homosexual and same-sex "temptation."
Yet his statement works just as well with blindness, cerebral palsy, and pedophilia.
God is no man's debtor. He always does a perfect job stewarding our suffering and the suffering of our loved ones.