Joshua Bell emerged from the Metro and positioned himself against a wall beside a trash basket. By most measures, he was nondescript—a youngish white man in jeans, a long-sleeved T-shirt, and a Washington Nationals baseball cap. From a small case, he removed a violin. Placing the open case at his feet,…

When the Moravian missionaries first went to Greenland, they were months and months teaching the poor Greenlander about the Godhead, the doctrine of the Trinity, and the doctrine of sin and the law, and no converts were forthcoming. But one day, by accident, one of the Greenlanders happened to read that…