In the end, Carver is trying to say that the narrator suddenly feels free, unbound by the confines of his home or his thoughts. His time with the blind man has changed him, and made him feel connected to something for the first time in his life, and it is inspiring to him. Good Country People" contains several themes, including the theme of Christianity and ugliness. Joy is an ugly person, not because she is physically ugly, but because she makes herself ugly inside, which is the truest form of ugliness. She is an unhappy and lonely woman who says she believes in "nothing" but really does hold out hope that she can live a normal life and be loved by someone. She is sucked in by the Bible salesman, who really believes in nothing either, and takes advantage of her in the worst way. He is ugly too, because he is a liar and worst of all, posing as a Christian when he is really evil. Which brings up the other theme in the story. The boy pretends to be a pious Christian, when really he is anything but. This theme indicates that many people who believe they are "Christians"...

They do many things that are distinctly un-Christian like, just like the Bible salesman. So, a person can say they are a "Christian" but that does not really mean they have good morals and ethics, they just act like they do, because they believe in God. These themes can be found in just about any life, because there are people that illustrate these themes just about everywhere.
References

Carver, R. (2008). Cathedral. Retrieved 31 Jan. 2008 from the North Dakota State University Web site: http://www.ndsu.nodak.edu/instruct/cinichol/GovSchool/Cathedral2.htm.

Ginsberg, a. (2008). Howl. Retrieved 31 Jan. 2008 from a Personal Web site: http://members.tripod.com/~Sprayberry/poems/howl.txt.

O'Connor, F. (2008). Good country people. Retrieved 31 Jan. 2008 from the Louisiana Tech University Web site: http://www.barksdale.latech.edu/Engl%20308/GOOD%20COUNTRY%20PEOPLE.doc.