Denial has various outlets in this book. One of the most obvious ways denial is shown is through the relationship between Gene and Finny. Throughout the book, it is clear to the reader that Gene is jealous of Finny; however, he is in denial of his own jealousy and tries to justify it by masking it as something else. In chapter 2, Finny gets himself out of trouble. It's not the first time and it won't be the last. Gene reacts by saying
I was beginning to see that Finny could get away with anything. I couldn't help envying that a little, which was perfectly normal. There was no harm in envying even your best friend a little.
Gene is in complete denial that he is not only more jealous than he lets on, but that he is actually ashamed to be feeling jealous. His justification is a mask for how he truly feels about Finny and his own guilt for feeling jealous. To find more quotes about Gene's denial of his jealousy toward Finny, I would suggest looking for any scene in which Gene is explaining his conflicting feelings toward Finny and trying to pretend his feelings are something they are not.
Gene isn't the only one in denial. A large aspect of this novel is the war and Finny's denial that the war is even happening. He believes, or wants to believe, that the war is actually just a group of fat men talking about war. Really, this is Finny's way of rejecting the reality of war. He is avoiding having to face something that causes such conflict. In Finny's mind, everything is a game and he cannot fathom the harsh reality of war. To find quotes regarding Finny's denial of the war, it would be helpful to read through chapter 8.