In Ray Bradbury's novel "Fahrenheit 451," Guy Montag is the fireman whose job it is to burn books. He says and thinks things that reveal serious and dangerous doubts about the wisdom of his job.
Montag and the firemen burn books because they assume they are all bad. However, Montag states, "Don't judge a book by its cover," meaning that one should not assume all books are bad but should look at the ideas inside the covers and value the knowledge contained within.
As Montag changes in the story, he becomes more daring and says "When you've got nothing to lose, you run any risk you want." He realizes that his world is a nightmare and any risk to change it is worth taking.
Later, as Montag seeks to rationalize his desire to stop burning books, he thinks, "The sun burnt every day. It burnt Time . . . Time was busy burning the years and the people anyway, without any help from him. So if he burnt things with the firemen and the sun burnt Time, that meant that everything burnt!" Montag concludes he must stop contributing to the burning and destruction of things.