A  nurse on the pediatric ward, before listening to the little  
ones  chests, would plug the stethoscope into their ears and  
let  them listen to their own hearts. Their eyes would always  
light  up with awe, but she never got a response equal to four-
year old David's comment.
    
        Gently  she tucked the stethoscope into his ears  and
placed  the disk over his heart. "Listen", she  said.
........."What  do you suppose that is?" He drew his
eyebrows  together in a puzzled line and looked up
as  if lost in the mystery of the strange tap - tap -  
tapping  deep in his chest.

 Then  his face broke out in a wondrous grin and he  
asked,  "Is that Jesus knocking?"