Theme in Fight Club

I found an article on one of my favorite movies, Fight Club. The article describes the themes in the film mainly revolving around the idea of freedom that the main character, Edward Norton, is searching for. He is searching for freedom from materialism and that the things he purchases defines him. The main character goes to help groups that he does not really need. For example, he attends a group from men battling testicular cancer. He finds that once he cries and releases his pain he can finally fall asleep. He 'meets' Tyler Durden, who is everything the main character wants to be. The Fight Club starts and this is a symbol that once the character feels physical pain he feels alive. He starts going to work with bruises and bloody clothes. His confidence rises and is arrogant about his appearance. The article is very descriptive and I really want to watch the movie again to pick out all the symbolism.