During a friendly meeting on January 19 with an ecumenical delegation from Finland, Pope Francis affirmed his commitment to reunion with Lutheran Christians by offering an historical claim about the great German reformer: “The intention of Martin Luther five hundred years ago was to renew the Church, not divide her.” A day or so before, news had begun circulating that Vatican City would honor the five hundredth anniversary of Luther’s Ninety-Five Theses with a special postage stamp. And earlier this fall, the pope praised Luther for having re-focused the Church’s attentions on the centrality of Scripture, blaming subsequent divisions between...