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"I wish I could say that everything went back to normal, but it didn't. Especially me."

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I think the author wanted the readers to realize that even if it's hard, we have to do the right thing. Basically, the author is saying people should have enough courage to do the right thing and it makes them the better person.

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"I caught one quick look at his face; it was red-marked from falling embers and sweat streaks, but he grinned at me. He wasn't scared either."

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""You really killed him, huh, Johnny?" "Yeah." His voice quavered slightly. I had to. "They were drowning you Pony. They might have killed you.""

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"Johnny worshiped the grounds Dallas walked on, and I had never heard Johnny talk back to anyone, much less his hero."

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The theme developed throughout the novel, because of how they first introduced it till the end. First, they introduced it when Johnny had the courage to go against Dally, when he was teasing the two Soc girls. Then, Johnny was brave enough to save Ponyboy and kill Bob, when Bob was choking Ponyboy. Also, after they were going back to the church, they saw the church on fire and there were children inside it. Johnny and Ponyboy did not think twice and went in to save the kids, because they were brave enough too. Finally, even after Johnny and Dally died. Ponyboy was brave enough to still go to school with all of his issues.