Pope Francis — also known as Time's Person of the Year and Twitter's #bestpopeever — has done a lot of talking since he was installed on the throne of St. Peter in March, tackling everything from luxury cars to income inequality in a series of interviews, sermons and written exhortations.

But for veteran Vatican watcher John Thavis, the pontiff's most significant pontificating came July 29 when he gave a press conference on a flight back from Brazil.

"Who am I to judge?" he asked. Francis was addressing the issue of gays in the church, but it was the tone as much as the topic that caught the public's attention.