At a certain point, some advocates of the “Bible as the only source of morality” paint themselves into a corner. It is like those people who say that because they have a Bible, they don’t need human teachers. But the Bible says that they do need human teachers. So they must be wrong on two counts. First, the Bible establishes human teachers instead of dislodging them, and second, this fact in Scripture is so obvious that if anybody needed a human teacher, it would be the guy who doesn’t see that.