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This novel reminds me of endurance through hard trials, and trusting the people within your life. Many times we want to throw in the towel and give up hope, but if we put our trust in the right things, our hope will be sustained. Rick captures this notion throughout all the Percy Jackson works.
I am further reminded about the film The Chronicle of Narnia, and while I am currently reading the series, I believe this theme is present in that work as well. It shows a deep sense of trust for your comrades and an understanding of hope.