It would be easier to have a harder heart, and a more cynical turn of mind.

If my whole reliance and confidence were not placed in you, I must have a hard heart indeed.

There might be ways to reach the hardest heart, given time and patience.

"It takes a hard heart never to look back, even once."

But the words had fallen on a hard heart.

That she'd stayed with him touched his hard heart the way nothing else had ever done.

"I have seen a lot of young ladies who are beautiful but with a hard heart," she says.

Is there any cause in nature that makes these hard hearts?

Perhaps his hard heart had finally killed the love she'd once felt for him.

Should our party be led by someone who boasts a hard heart?