Due to its location among sheer mountains and its northern latitude, Rjukan, Norway, does not see natural sunlight from October to March. To lighten up the town, the citizens installed large mirrors on the mountainside to reflect the sunrays and beam sunlight into the town square. The continuous glow is made possible because the giant mirrors rotate with the rising and setting sun.

I like to think of the Christian life as a similar scenario. Jesus said His followers are “the light of the world” (Matt. 5:14). John the disciple wrote that Christ the true light “shines in the darkness” (John…