At a museum, I lingered near a display of ancient lamps. A glance at some printed information revealed they were from Israel. Decorated with carved designs, these oval-shaped clay vessels had two openings—one for fuel, and one for a wick. Although the Israelites commonly used them in wall alcoves, each was small enough to fit in the palm of a person’s hand.

Perhaps a little light like this inspired King David to write a praise song in which he said, “You Lord are my lamp; the Lord turns my darkness into light” (2 Samuel 22:29). David sang these words after God…