What is it that he understood?and how is it that he figured it out?

he was then shown both heaven and hell.in both places there were huge banquet tables laden with food and in each place setting was a set of 4 ft.long chopsticks.in one location the people were happy and well fed and in the other they looked as though they were starving.his guide informed him that the only rule was that youu could not eat with your hands.the good man pondered this for a while and then stated "I understand".