I fully believe that the Lord heals broken hearts as His word promises in Psalm 147:3. It seems to me though that the healing He brings doesn’t necessarily restore the heart to its exact state before it was broken. If you’ve experienced a broken heart, you know what I mean. Suddenly you see things in a new light, you care more about other people’s pain, and you react differently than you had previously to the suffering around us. Others who haven’t walked that road couldn’t possibly understand – they think we’re over-emotional or “too attached”. But it’s now who we are.
Something I used to do with a simple piece of paper when I was a kid may help illustrate. As you read this, try it: take a piece of regular copy/printer paper, crumple it, reform it, and repeat many times. After a few reps of this action, you’ll notice the paper begins to transform. It becomes softer, more pliable, and eventually, you’ll find that light shines through it much easier (hold it up to a light or computer monitor to see what I mean). It’s the same with a broken heart. As our hearts are crushed, and the Lord “straightens” them back out again, healing us - He transforms them. He makes our hearts softer : suddenly events that we were quite callous to previously touch us deeply. He makes our hearts more pliable: we’re more flexible and able to change according to the need and pain around us. He makes the light shine through our hearts more easily: so that this light can more readily reach those around us. The broken heart looks quite differently than it did prior to the pain, but once restored, is a useful and powerful tool in the hands of the Lord, and will never be the same.
And we know that in all things God works for the good of those who love him, who have been called according to his purpose.