" The lambs in their arms were as smooth as mushrooms, the flock at their heels unruffled. And amid all that froth of fleece, white and metrical as soap-suds, there was no sign of a black lamb.
What more could one ask, at a children’s Christmas Eve service? Yet I found that I did indeed want more, especially for the children’s sake—faces trodden by crows’-feet, signs of the ferment, one might almost say chaos, that this unprecedented event brought once and ever brings; something of life, even in carven faces, someone out of breath with running, someone stricken with joy.
And I dearly wanted a black lamb. For, without him, where are the ninety and nine? Flocks, like families, have need of their black sheep—he carries their sorrow for them. He is the other side of their whiteness. Does nobody understand, I wondered, that a crib without a black lamb is an incomplete statement? "

― P.L. Travers , The Fox at the Manger