What sets G. K. Chesterton and Orthodoxy apart is the way in which he combines both reason and imagination into what writer Garry Wills has called “the Chestertonian dialectic.” He applied his Christian belief to everything, and everything was relevant to his Christian belief. This makes the process of trying to discover what he believed about any particular thing sometimes frustrating.
If you want to know his beliefs about a particular poet, you might only find it in one of his works of social and political commentary. If you are looking to see what he thought about the French Revolution, you might have to look for it in one of his detective novels. And if you are looking for his thoughts on Christianity, they are in everything he ever wrote. Yet if you were forced to choose one book that best represents Chesterton’s thoughts on Christianity, this is the one. In his other books he uses Christianity to defend Reality. In Orthodoxy he uses Reality to defend Christianity and shows how every modern worldview has founded its truth on Christendom. No one ever did it better.