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In the story Paper Towns, John Green hinted greatly of the theme of never giving up. Margo went missing, and Quentin began his quest of finding her, because there have been hints of depression in Margo's personality, and the clues she left about her location suggested her suicide. He went to great lengths to find her,  even going as far as lying directly to his parents, and even ignoring a government detective. In page 155, Quentin even muttered the words, "I will play out the string. I will not betray your trust. I will find you." Another instance of this theme showing up in the book is the overprotection of Margo's parents. Although they eventually gave up when Margo became an adult, they kept trying for years to contain Margo from running away and doing dangerous and illegal stuff. They tried and tried, trying desperately to decode clues, and find Margo when she ran away. These signs are definite signs that shows that the theme in the book is made clear by John Green.

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In the story The Fault in our Stars, there have been many instances of the theme of never giving up.  For example, when Hazel was told the news that she couldn't go to Amsterdam because of her illness, she kept fighting and begging for her wish to go to Amsterdam, and eventually achieved it through her perseverance. another examples of John Green using this theme in the book was when the author of Hazel's favorite book denied Hazel her deepest wish. She kept fighting for her wish and although she failed, she and Augustus kept trying out of Amsterdam, sending E-mails and eventually achieved their goal, with Augustus trying, because it was his dying wish. Another side evidence of trying hard is Augustus's will to keep up his humor right until his last breath. Everybody told him to rest and do nothing for his last final week, but he kept his spirit and never gave up on his grasp for happiness and humor. With so many instances of characters not giving up, this is without a doubt, one of the themes of The Fault in our Stars.

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You should never give up and try as hard as you can to achieve your goals, no matter how hard or impossible it seems.