3. There are several themes to this novel, what is the greatest one?

I believe the greatest theme of the novel involves the relationship between the pain of actual experience and feeling one's feelings, on the one hand, and on the other hand the equally devastating numbness that comes with shutting down one's emotions in order to avoid suffering. After the death of Allie, Holden basically shuts down, forcing himself to lose all attachments to people so as never to be hurt again. He continually mentions how important it is not to get attached to anyone, since this will lead to missing them once they are gone. By the end of the novel, he has spiraled so far down with this theory that he has become afraid to even speak to anyone. Phoebe is the only reminder that Holden still has the ability to love. When he looks at her, he cannot help but feel the same tortured love that he felt for Allie. Nevertheless, the surges of these feelings leave him even more saddened. He knows he must leave Phoebe to protect himself, but when she shows up to accompany him on his journey, ultimately he puts his love for her first and sacrifices his own instinct to flee in order to return home.

Holden, it seems, is in the throes of an existential crisis. To a great degree he is numb to the pains and joys of life. Unable to come to terms with his brother's death, he has no one to show him the kind of parental or brotherly love that he himself gave Allie. Whenever someone does end up showing him even a hint of such love (such as Mr. Antolini), Holden ends up being disappointed.