Where I thought he was going with this story: God always keeps the string over the door for us. Even when we stray from our faith, that string is there; we only have to pull on it and the door will open.
Where he actually went with the story: The string wasn't over the door when the disciples and Jesus' other followers were in the locked room following his death. They were scared and in hiding. He asked us to close our eyes and imagine that we are in that room, and to imagine that we are the ones who are to keep the children occupied...and quiet. I could feel a portion of the tenseness that those followers had to have felt, especially when there was a familiar knock on the door.
He asked us how we find mercy when our world has been upended. To find mercy, we have to extend mercy. And, to do that, we have to hand every aspect of our life over to Jesus.