I wouldn't undertake to correct a man's sectarian views any quicker than I would tell him which road to take at a 4 corners, when I didn't know myself which was the right one.
One of the peculiar sins of the twentieth century which we've developed to a very high level is the sin of credulity. It has been said that when human beings stop believing in God they believe in nothing. The truth is much worse: they believe in anything.
