C.S. Lewis used many different themes throughout his books, but they all had a Christian base. This use of theme allowed him to communicate with his readers about Christianity and moral thought. He used themes such as good VS. evil, human choice VS. sinful nature, and good conquers all.
Lewis used a variety of themes; however, he did not often stray from the few listed above. In his Sci-fi book Out of the Silent Planet, he uses all these themes as well as adventure themes that are commonly used such as finding a utopian society. The book's main theme is good versus evil, as the main character Ransom is kidnapped by two scientists and taken to Mars, where he learns the ways of the natives and befriends them. He then fights alongside them, to defeat the men who brought him to the planet and overcome them with the help of the Oarysa or God of the planet. This theme is displayed in a quote said by Oarysa “A bent hnau can do more evil then a broken one.”(Lewis 137). The quote states that there are good and evil but a truly evil person is more dangerous than one who has been broken by evil, because they are truly lost to reason beyond their own selfish desires.
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Lewis used the themes of Christianity in many of his books alongside others, because of this many of his books are allegories to it or take inspiration from the Bible. In his book The Screwtape Letters, he uses the theme of human choice VS. sinful nature. The book uses the idea that each person has a devil and an angel on their shoulder tempting them to their side. It brings up the idea of having to choose to do the righteous thing instead of the easy or natural way. In one of the letters, these ideas are perfectly described as what happens when humans take the easy path, not realizing that it is the road to hell. “Indeed the safest road to hell is the gradual one-the gentle slope, soft underfoot, without sudden turnings, without milestones, without signposts.”(Lewis