Hearts of Stone
Think about it:
Do people with hearts of stone ask God to give them a different kind of heart?
Ezekiel 36:26 And I will give you a new heart, and a new spirit I will put within you. And I will remove the heart of stone from your flesh and give you a heart of flesh. 27 And I will put my Spirit within you, and cause you to walk in my statutes and be careful to obey my rules.