When God makes a hardened heart become a heart of flesh He shapens you, restructures you, reassembles you into "best fit".....!
Take a glimpse about a Potter and a Clay
When a Potter smashes a clay, it isn't good at sight.... It's painful, heartbreaking , crushing ....with time it becomes better than it was...!!!
It may be painful & annoying at first..... But eventually it's all for your good.