Once Rav Shach was trying to encourage a non religious heart surgeon, to become religious.
He asked the surgeon as follows. How often do you buy yourself a brand new car? The doctor answered, ” every 2 years I upgrade to a more luxurious car”. Rav Shach then asked, “would you ever change the heart that you you have now to a diffrent heart?
The surgeon answered, “of course not! Even the man made hearts don’t come close to the “natural” heart”.
Rav shach smiled and said, ” no matter how many cars are made, every 2 years a better car comes out. But whenever the top heart surgeon cant come close to hashems heart.