One day a man was sitting by a river minding his own business when a stranger walking by noticed the back of the man’s neck and decided to give it a slap theorising on what kind of sound it would make. The man clasping his now stinging neck, jumped up to hit the stranger back.
His attacker said “Hold on! Answer this for me – what made the sound, my hand or the back of your neck?”
The man answered “When you have experienced exactly what I’m feeling now you will be able to work it out for yourself and see the value in your theory!”
(Paraphrased parable – exact source unknown)