" You can live for a long time inside the shell you were born in. But one day it'll become too small."
"Then what?" I ask.
"Well, then you'll have to find a larger shell to live in."
I consider this for a moment. "What if it's too small but you still want to live there?"
She sighs. "Gracious, child, what a question. I suppose you'll either have to be brave and find a new home or you'll have to live inside a broken shell. "

― Christina Baker Kline , A Piece of the World