We've talked about, hey, who is the real heir to the Roman Empire? We've talked about Latin versus Greek. We've talked about the Germanic kings having influence now and really following the west. We've talked about the notion of philoque. And those aren't all of the issues. On top of that, you have this notion of leavened and unleavened bread, wherein the west, in their mass, when they are consecrating the bread to be viewed as the body of Christ, they used unleavened bread based on the belief that this is what Christ used during the Last Supper. And the east, they said, no, we have agreed to use leavened bread.