An example of evidence is when Johnny dies. At first Ponyboy tries to pretend that Johnny isn't dead because he doesn't want to deal with the pain. (page 150) Although it all comes together and Ponyboy writes about it as his important theme.
A second example of evidence is when Ponyboy finds Johnny's note. (page 178) On the note it says that it isn't to late to find what you want to do. Ponyboy listens to this advice and decides not to give up. He gets himself together to fix his life.