Source: From a book by Robert Folgrum, as quoted here
Turn the light off in the room. Have one person hold the flashlight up and shine it down on the mirror. (You’ll have to experiment to find the best way to do this.) The person with the mirror’s task is to see if they can reflect the light into the darkest corner of the room. Let two or three people try this and see if they can light up a dark corner.
The story that goes with this would be that Christ or God represents the flashlight, and we are the mirror. The light or the power to bring light to the dark places does not originate with the mirror, it only reflects it into many different places.
That is our mission, our meaning in life, to reflect God’s light, or love into all of the dark places that we can.