Gerard O'Connell, Vatican correspondent for the Jesuit magazine America, says the pope's participation in commemorating the Reformation is proof of the extraordinary change in Catholic-Lutheran relations.
"A recognition, perhaps, that both sides missed something at the time of the Protestant Reformation," says O'Connell. "The Catholic Church missed ways of reforming itself. Luther and those around him pressed in a way that just couldn't be taken on board, so, in a way, both sides misspoke."
Source: Gerard O'Connell - As quoted on National Public Radio, 28 Oct 2016, "The Pope Commemorates The Reformation That Split Western Christianity", http://www.npr.org/sections/parallels/2016/10/28/499587801/pope-francis-reaches-out-to-honor-the-man-who-splintered-christianity