Read it again. It basically says exactly what I said. They cannot stand without each other because they are from the same source for the same purpose. They are the same thing - God communicating to His people (which by definition is an infallible communication). How He chooses to communicate the message does not change the message. They cannot be "compared" (is A>B or A=B or A What did Augustine have to say about church authority?
Who cares what Augustine said about church authority. When you can show Augustine as reliable as the Apostles, I'll give a hoot what Augustine said. You can't do that. And we have scripture that deliniates the authority of offices and of scripture. They don't rise to the level your clergy has raised from whole cloth and the opinions of men.