On the final day of a Christian publishing conference in Singapore, 280 participants from 50 countries gathered in the outdoor plaza of a hotel for a group photo. From the second-floor balcony, the photographer took many shots from different angles before finally saying, “We’re through.” A voice from the crowd shouted with relief, “Well, joy to the world!” Immediately, someone replied by singing, “The Lord is come.” Others began to join in. Soon the entire group was singing the familiar carol in beautiful harmony. It was a moving display of unity and joy that I will never forget.

In Luke’s…