“There’s been something I’ve been wanting to ask you, Father,” said Nurse Kennedy, walking with him along the hall.
“Why is it God so often breaks our hearts?”
“Well.  Sometimes He does it to increase our faith.  That’s the way He stretches us.  But there’s another reason, I think, why our hearts get broken.”
She looked at him.
“Usually,” he said, “what breaks is what’s brittle.”
She  nodded thoughtfully.  “So we have to be careful of getting hard-hearted?”
“Bingo,” he said, putting his arm around her shoulders as they walked to the end of the hall.

Words of wisdom from Jan Karon’s Mitford book, These Hill, Green Hills.