"There he goes again." That's what some of my Catholic friends have taken to saying every time Pope Francis makes a statement — usually off the cuff in a public forum — that appears to break from or raise significant, perplexing questions about some aspect of church teaching. Such declamations are becoming more frequent. Less than two weeks ago, the pope stated that because the West is dominated by a "culture of the provisional," the "great majority" of Catholic marriages are "null" — meaning nonexistent.