Job isn't happy with the pain and embarrassing nature of his position. He reminisces about the good ol' days and tries to understand why he's being punished.
He concludes that he has done all God asked, and that God owes him an explanation. Wait, where have we heard that before? Oh yeah, that's right—everywhere in this entire book.
Think X-Men here. Really. The whole point of Wolverine's scenes is to show you that Hugh Jackman is a cool dude. That way, the audience is totally with him when he demands answers about his origins.