A mechanic was removing a cylinder head from the motor of a motorcycle when he spotted a well-known heart surgeon in his shop. The surgeon was waiting for the service manager to look at his bike.
The mechanic shouted across the garage, “Hey Doc, can I ask you a question?”
The surgeon, a bit surprised, walked over to the mechanic. He said, “Sure, what’s your question?”
Straightening up, the mechanic wiped his hands and said, “So Doc, look at this engine. I open its heart, take out the valves, fix them, put them back in when I’m finished, and it works just like new. So how come I get such a small salary and you get the really big bucks, when you and I are doing basically the same work?”
The surgeon paused, smiled, and leaned over and whispered to the mechanic, “Try doing it with the engine running.”
That’s the miracle of God’s work on the human heart. He does a heart transplant while we are still walking around. He gives what the Bible calls a “new heart” to anyone willing to embrace change. God does what no mechanic or physician can ever do. He does work that never needs to be redone.