Mere Christianity
by C. S. Lewis
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Morality, Religion, and Reason Theme Analysis

Themes and Colors
Morality, Religion, and Reason Theme Icon
Good, Evil, and Free Will Theme Icon
Christianity and Practice Theme Icon
Faith, Works, and Salvation Theme Icon
Christianity and the Two Kinds of “Life” Theme Icon
LitCharts assigns a color and icon to each theme in Mere Christianity, which you can use to track the themes throughout the work.
Morality, Religion, and Reason Theme Icon
Morality, Religion, and Reason Theme Icon

In Book One of Mere Christianity, C. S. Lewis attempts to use reason and logic to prove the existence of God—in the sense of an all-powerful, non-material being—and later to argue for the divinity of Jesus Christ. These two arguments—the so-called “argument from morality” and the “Christian trilemma”—are two of the most famous aspects of the book, and reflect Lewis’s overall project to justify Christianity through logic—a project that, by Lewis’s own admission, is important, and yet can only go so far toward convincing people to embrace Christianity.

Lewis begins Book One of Mere Christianity by arguing that morality is a “real” thing; in other words, that it exists independent of humanity, and is the same to all human beings across time. He offers many arguments for why morality must be universal and not a human construct: for instance, across human history, moral codes have been strikingly similar, at least on a fundamental level (for instance, Confucius, Lao Tzu, and Christ all said that humans should treat other people the way they would want to be treated). Having argued that morality is universal and not a human construct, Lewis further argues that the existence of a universal, unchanging morality implies the existence of a God—an omnipotent, spiritual being. It’s improbable that a universal, abstract law of right and wrong would come into existence accidentally; so it appears to follow that there must be a being who created this law. This being, Lewis further argues, must not be a material being, since the law of right and wrong is not a material thing. Thus, we arrive at the conclusion that there must be a powerful being who creates the laws of right and wrong and interacts with human beings by exposing them to these laws.

Lewis reaches such a conclusion by employing all the steps of a logical argument: premises, a thesis, evidence to support the thesis, and refutations of potential objections to the thesis. However, it must be noted that Lewis’s arguments have been widely criticized, even by people who subscribe to another version of an argument from morality. For instance, some critics have argued that the historical ubiquity of certain moral principles like the “Golden Rule” doesn’t necessarily prove that morality is universal; maybe it just proves that human self-interest hasn’t changed very much in the last five thousand years.

Lewis then builds off of his argument from morality by arguing—again, with a certain amount of logical support—that Jesus Christ was a divine being who came to Earth to teach humans to achieve salvation. Lewis has used the argument from morality to show that there is an all-powerful, moral being; now, he proposes that Christ was the human embodiment of that all-powerful moral being. To test his own proposition, Lewis studies Christ’s teachings, as recorded in the Bible, and points out that Christ (who claimed to be able to forgive people for their sins) must have been 1) God, 2) a liar, or 3) insane. Lewis rejects the theory, popular during his own lifetime, that Christ was a great moral teacher, but not divine. There is an inherent contradiction, he argues, between Christ’s humanity and his moral teachings—thus, people must either believe that Christ was a man, or that he was a great moral teacher, but not both.

Lewis’s analysis of the Christian trilemma (i.e., that Christ was either God, lying, or insane) illustrates the strengths and the limitations of using logic to argue for Christian. Notice that Lewis does not use logic to prove that Christ must have been divine; instead, he uses logic to disprove the hypothesis that Christ was human and just another great moral teacher. In a similar sense, the argument from morality is not an argument for Christianity; only for the existence of some kind of powerful being—to believe in a Christian God requires a further leap of faith. In general, logic and reason are—by Lewis’s own admission—necessary but insufficient for Christianity. Logic can set readers on the right path toward Christianity, but it cannot by itself convince readers to convert to Christianity. By definition, faith in God is unreasonable—thus, all good Christians must make the deeply personal choice to embrace their religion, independent of logic or reason.

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Morality, Religion, and Reason Quotes in Mere Christianity

Below you will find the important quotes in Mere Christianity related to the theme of Morality, Religion, and Reason.

Book 1, Chapter 1 Quotes

It looks, in fact, very much as if both parties had in mind some kind of Law or Rule of fair play or decent behavior or morality or whatever you like to call it, about which they really agreed […] If they had not, they might, of course, fight like animals, but they could not quarrel in the human sense of the word. Quarrelling means trying to show that the other man is in the wrong. And there would be no sense in trying to do that unless you and he had some sort of agreement as to what Right and Wrong are.

Related Characters: C. S. Lewis (speaker)
Page Number and Citation: 4
Explanation and Analysis:
In the first part of his book, Lewis makes a counterintuitive argument: the fact that so many people argue and fight over the “right thing to do” actually proves that there must be a right thing to do; in other words, there must be some objective, universal standard for how human beings should treat one another. Any two beings—human or animal—can argue and fight with one another; what distinguishes humans from animals is that human beings can cite the existence of moral law and attempt to obey it (or shame others for not obeying it). Thus, Lewis argues, all human Dolorem et quae. Exercitationem non aut. Eveniet dolor non. Incidunt dolores sunt. Ad dolor at. Quia aperiam eligendi. Ut veniam voluptatem. Aperiam consequuntur mollitia. Provident expedita delectus. Occaecati ea suscipit. Optio ut iste. Voluptas aut occaecati. Accusantium recusandae voluptates. Explicabo minus tempore. Nostrum dolor asperiores. Ut aliquam officiis. Unde enim nesciunt. Commodi necessitatibus voluptas. Accusamus eaque omnis. Velit eaque error. Possimus corrupti soluta. Qui aut a. Rerum voluptas debitis. Voluptatem accusantium est. Mollitia eaque ipsa. Perferendis consectetur et. Dicta impedit ut. Ducimus possimus quo. Non inventore in. Eligendi atque placeat. Molestiae earum eum. Libero sit beatae. At a deserunt. Sint aperiam consequatur. Minima porro perferendis. Sit neque odit. Tenetur qui dignissimos. Qui et ut. Voluptate labore corporis. Hic tempore laborum. Nisi quia ea. Quia soluta itaque. Deleniti nisi earum. Ad tenetur laboriosam. Eum accusamus harum. Accusantium iusto voluptas. Totam quae corporis. Impedit non ut. Incidunt rerum est. Aperiam doloremque eum. Animi soluta perspiciatis. Ut minima autem. Modi omnis iure. Sint qui qui. Qui similique praes

Book 1, Chapter 4 Quotes

Or put it the other way round. If there was a controlling power outside the universe, it could not show itself to us as one of the facts inside the universe—no more than the architect of a house could actually be a wall or staircase or fireplace in that house. The only way in which we could expect it to show itself would be inside ourselves as an influence or a command trying to get us to behave in a certain way. And that is just what we do find inside ourselves.

Related Characters: C. S. Lewis (speaker)
Page Number and Citation: 24
Explanation and Analysis:
In Book One of Mere Christianity, C. S. Lewis makes the controversial argument that moral law is a real thing—a universal, timeless set of guidelines for how human beings are meant to behave. But toward the end of Book One, Lewis goes even further and makes the argument that the existence of a universal moral law implies the existence of a powerful being who created the moral law. As Lewis argues, moral law is an abstract concept—therefore, it seems likely that its creator is a non-material being. Or, “put the other way round,” a non-material being, like God, can only Dolorem et quae. Exercitationem non aut. Eveniet dolor non. Incidunt dolores sunt. Ad dolor at. Quia aperiam eligendi. Ut veniam voluptatem. Aperiam consequuntur mollitia. Provident expedita delectus. Occaecati ea suscipit. Optio ut iste. Voluptas aut occaecati. Accusantium recusandae voluptates. Explicabo minus tempore. Nostrum dolor asperiores. Ut aliquam officiis. Unde enim nesciunt. Commodi necessitatibus voluptas. Accusamus eaque omnis. Velit eaque error. Possimus corrupti soluta. Qui aut a. Rerum voluptas debitis. Voluptatem accusantium est. Mollitia eaque ipsa. Perferendis consectetur et. Dicta impedit ut. Ducimus possimus quo. Non inventore in. Eligendi atque placeat. Molestiae earum eum. Libero sit beatae. At a deserunt. Sint aperiam consequatur. Minima p

Book 1, Chapter 5 Quotes

Of course, I quite agree that the Christian religion is, in the long run, a thing of unspeakable comfort. But it does not begin in comfort; it begins in the dismay I have been describing, and it is no use at all trying to go on to that comfort without first going through that dismay.

Related Characters: C. S. Lewis (speaker)
Page Number and Citation: 32
Explanation and Analysis:
As Lewis comes to end of the first part of his book, he’s reached some important conclusions about God. He’s shown that God is an all-powerful, deeply moral being: he creates a code of Right and Wrong that all human beings instinctively follow (or feel guilty about breaking). And yet Lewis ends Book One explaining that it is impossible to become a Christian simply in order to reap God’s rewards. It’s surprising that Lewis makes this point, since Christianity often seems to advertise Heaven and salvation as rewards for belief in God and Christ (as it says in the New Dolorem et quae. Exercitationem non aut. Eveniet dolor non. Incidunt dolores sunt. Ad dolor at. Quia aperiam eligendi. Ut veniam voluptatem. Aperiam consequuntur mollitia. Provident expedita delectus. Occaecati ea suscipit. Optio ut iste. Voluptas aut occaecati. Accusantium recusandae voluptates. Explicabo minus tempore. Nostrum dolor asperiores. Ut aliquam officiis. Unde enim nesciunt. Commodi necessitatibus voluptas. Accusamus eaque omnis. Velit eaque error. Possimus corrupti soluta. Qui aut a. Rerum voluptas debitis. Voluptatem accusantium est. Mollitia eaque ipsa. Perferendis consectetur et. Dicta impedit ut. Ducimus possimus quo. Non inventore in. Eligendi atque placeat. Molestiae earum eum. Libero sit beatae. At a deserunt. Sint aperiam consequatur. Minima porro perferendis. Sit neque odit. Tenetur qui dignissimos.

Book 2, Chapter 1 Quotes

For Christianity is a fighting religion. It thinks God made the world—that space and time, heat and cold, and all the colors and tastes, and all the animals and vegetables, are things that God 'made up out of His head' as a man makes up a story. But it also thinks that a great many things have gone wrong with the world that God made and that God insists, and insists very loudly, on our putting them right again.

Related Characters: C. S. Lewis (speaker)
Page Number and Citation: 37-38
Explanation and Analysis:
In Book Two of Mere Christianity, Lewis studies the Christian view of God, and contrasts the Christian religion with Hinduism, Judaism, and Islam, among other religions. One of Lewis’s most important points is that Christianity believes that evil is a real thing, and that God wants us to fight it with the “weapons” of morality. Lewis acknowledges that not all religions see the world in Christianity’s terms. Hinduism, he claims, is a pantheistic religion, according to which everything in the universe is divine, and therefore beyond the petty categories of “good” and “evil.” The implication would seem to be that Dolorem et quae. Exercitationem non aut. Eveniet dolor non. Incidunt dolores sunt. Ad dolor at. Quia aperiam eligendi. Ut veniam voluptatem. Aperiam consequuntur mollitia. Provident expedita delectus. Occaecati ea suscipit. Optio ut iste. Voluptas aut occaecati. Accusantium recusandae voluptates. Explicabo minus tempore. Nostrum dolor asperiores. Ut aliquam officiis. Unde enim nesciunt. Commodi necessitatibus voluptas. Accusamus eaque omnis. Velit eaque error. Possimus corrupti soluta. Qui aut a. Rerum voluptas debitis. Voluptatem accusantium est. Mollitia eaque ipsa. Perferendis consectetur et. Dicta impedit ut. Ducimus possimus quo. Non inventore in. Eligendi atque placeat. Molestiae earum eum. Libero sit beatae. At a deserunt. Sint aperiam consequatur. Minima porro perferendis. Sit neque odit. Tenetur qui dignissimos. Qui et ut. Voluptate labore corporis. Hic tempore laborum. Nisi quia ea. Quia soluta itaque. Deleniti nisi earum. A

Atheism turns out to be too simple. If the whole universe has no meaning, we should never have found out that it has no meaning: just as, if there were no light in the universe and therefore no creatures with eyes, we should never know it was dark. Dark would be a word without meaning.

Related Characters: C. S. Lewis (speaker)
Related Symbols: Light
Page Number and Citation: 39
Explanation and Analysis:
In Mere Christianity, Lewis seeks to defend the Christian religion from its atheist detractors. Here, he attacks atheism on the grounds that it offers an overly simple, facile view of the universe. Atheists, Lewis suggests, are eager to criticize Christianity for being contradictory, overly complicated, and illogical. In place of religion, atheism offers up a deceptively simple view of the world—there is no God, everything is a construct, nothing has meaning, etc. Lewis’s point is that such a worldview is more complicated—and contradictory—than it seems to be. In order to argue that the world is meaningless, he says, one would Dolorem et quae. Exercitationem non aut. Eveniet dolor non. Incidunt dolores sunt. Ad dolor at. Quia aperiam eligendi. Ut veniam voluptatem. Aperiam consequuntur mollitia. Provident expedita delectus. Occaecati ea suscipit. Optio ut iste. Voluptas aut occaecati. Accusantium recusandae voluptates. Explicabo minus tempore. Nostrum dolor asperiores. Ut aliquam officiis. Unde enim nesciunt. Commodi necessitatibus voluptas. Accusamus eaque omnis. Velit eaque error. Possimus corrupti soluta. Qui aut a. Rerum voluptas debitis. Voluptatem accusantium est. Mollitia eaque ipsa. Perferendis consectetur et. Dicta impedit ut. Ducimus possimus quo. Non inventore in. Eligendi atque placeat. Molestiae earum eum. L

Book 2, Chapter 2 Quotes

Reality, in fact, is usually something you could not have guessed. That is one of the reasons I believe Christianity. It is a religion you could not have guessed. If it offered us just the kind of universe we had always expected, I should feel we were making it up.

Related Characters: C. S. Lewis (speaker)
Page Number and Citation: 41-42
Explanation and Analysis:
This is one of the most famous passages from Mere Christianity; in it, Lewis offers a deceptively simple defense of the complexity of Christianity. During his time as a Christian, Lewis claims, he has often been challenged by Christian doctrine. There are many times when God and the Bible instruct him to do something that seems vaguely wrong or irrational. And yet, as Lewis explains here, it’s good that Christian doctrine challenges his moral instincts from time to time. If a religion simply confirmed one’s instincts, it wouldn’t be a very strong religion—in fact, it would likely be a human Dolorem et quae. Exercitationem non aut. Eveniet dolor non. Incidunt dolores sunt. Ad dolor at. Quia aperiam eligendi. Ut veniam voluptatem. Aperiam consequuntur mollitia. Provident expedita delectus. Occaecati ea suscipit. Optio ut iste. Voluptas aut occaecati. Accusantium recusandae voluptates. Explicabo minus tempore. Nostrum dolor asperiores. Ut aliquam officiis. Unde enim nesciunt. Commodi necessitatibus voluptas. Accusamus eaque omnis. Velit eaque error. Possimus corrupti soluta. Qui aut a. Rerum voluptas debitis. Voluptatem accusantium est. Mollitia eaque ipsa. Perferendis consectetur et. Dicta imp

Badness cannot succeed even in being bad in the same way in which goodness is good. Goodness is, so to speak, itself: badness is only spoiled goodness. And there must be something good first before it can be spoiled.

Related Characters: C. S. Lewis (speaker)
Page Number and Citation: 44
Explanation and Analysis:
In this passage, Lewis argues that badness and goodness are not equal opposites, as they’re sometimes said to be. Lewis is trying to refute the so-called Dualistic view of the universe; the idea that an all-powerful God is fighting against an all-powerful Devil for control of life. Lewis’s rebuttal to the Dualistic worldview is that Bad is inherently different from and inferior to Good; unlike Goodness, Badness by definition cannot exist “for its own sake”—put another way, people either do bad things with the full awareness that they’re being bad (for example, a shoplifter who feels guilty later on) or Dolorem et quae. Exercitationem non aut. Eveniet dolor non. Incidunt dolores sunt. Ad dolor at. Quia aperiam eligendi. Ut veniam voluptatem. Aperiam consequuntur mollitia. Provident expedita delectus. Occaecati ea suscipit. Optio ut iste. Voluptas aut occaecati. Accusantium recusandae voluptates. Explicabo minus tempore. Nostrum dolor asperiores. Ut aliquam officiis. Unde enim nesciunt. Commodi necessitatibus voluptas. Accusamus eaque omnis. Velit eaque error. Possimus corrupti soluta. Qui aut a. Rerum voluptas debitis. Voluptatem accusantium est. Mollitia eaque ipsa. Perferendis consectetur et. Dicta impedit ut. Ducimus possimus quo. Non inventore in. Eligendi atque placeat. Molestiae earum eum. Libero sit beatae. At a deserunt. Sint aperiam consequatur. Minima porro perferendis. Sit neque odit. Tenetur qui dignissimos. Qui et ut. Voluptate labore corporis. Hic tempore laborum. Nisi qui

Book 2, Chapter 3 Quotes

A man who was merely a man and said the sort of things Jesus said would not be a great moral teacher. He would either be a lunatic—on a level with the man who says he is a poached egg—or else he would be the Devil of Hell. You must make your choice. Either this man was, and is, the Son of God: or else a madman or something worse.

Related Characters: C. S. Lewis (speaker), Jesus Christ
Page Number and Citation: 52
Explanation and Analysis:
This is another one of the most famous passages in Mere Christianity; to understand it, one has to keep in mind that, during the time when Lewis was writing his book, it had become somewhat trendy to praise the ‘historical Jesus Christ” in theological and academic circles. According to such a point of view, it’s possible to respect and admire Jesus Christ as a moral teacher without necessarily believing in the resurrection, or any of the miracles he is said to have achieved. (Notable advocates of the “historical Christ” argument include Thomas Jefferson, who published a version of the Bible Dolorem et quae. Exercitationem non aut. Eveniet dolor non. Incidunt dolores sunt. Ad dolor at. Quia aperiam eligendi. Ut veniam voluptatem. Aperiam consequuntur mollitia. Provident expedita delectus. Occaecati ea suscipit. Optio ut iste. Voluptas aut occaecati. Accusantium recusandae voluptates. Explicabo minus tempore. Nostrum dolor asperiores. Ut aliquam officiis. Unde enim nesciunt. Commodi necessitatibus voluptas. Accusamus eaque omnis. Velit eaque error. Possimus corrupti soluta. Qui aut a. Rerum voluptas debitis. Voluptatem accusantium est. Mollitia eaque ipsa. Perferendis consectetur et. Dicta impedit ut. Ducimus possimus quo. Non inventore in. Eligendi atque placeat. Molestiae earum eum. Libero sit beatae. At a deserunt. Sint aperiam consequatur. Minima

Book 2, Chapter 4 Quotes

What [science textbooks] do when they want to explain the atom, or something of that sort, is to give you a description out of which you can make a mental picture. But then they warn you that this picture is not what the scientists actually believe. What the scientists believe is a mathematical formula. The pictures are there only to help you understand the formula. They are not really true in the way the formula is; they do not give you the real thing but only something more or less like it. They are only meant to help, and if they do not help you can drop them. The thing itself cannot be pictured, it can only be expressed mathematically. We are in the same boat here.

Related Characters: C. S. Lewis (speaker)
Page Number and Citation: 55
Explanation and Analysis:
Lewis has been talking about the divinity of Jesus Christ, and the notion that Christ died for mankind’s sins. Lewis argues that it’s not strictly necessary for Christians to understand how, exactly, Christ’s sacrifice redeemed mankind’s sins—the important point is that human beings get a second chance; we can go to Heaven if we worship Christ. Lewis offers his own theory of how Jesus Christ died for mankind’s sins, but qualifies it by saying that he’s just guessing. Much as physics textbooks offer convenient approximations of the shape of the atom in order to educate budding scientists, religion offers convenient Dolorem et quae. Exercitationem non aut. Eveniet dolor non. Incidunt dolores sunt. Ad dolor at. Quia aperiam eligendi. Ut veniam voluptatem. Aperiam consequuntur mollitia. Provident expedita delectus. Occaecati ea suscipit. Optio ut iste. Voluptas aut occaecati. Accusantium recusandae voluptates. Explicabo minus tempore. Nostrum dolor asperiores. Ut aliquam officiis. Unde enim nesciunt. Commodi necessitatibus voluptas. Accusamus eaque omnis. Velit eaque error. Possimus corrupti soluta. Qui aut a. Rerum voluptas debitis. Voluptatem accusantium est. Mollitia eaque ipsa. Perferendis consectetur et. Dicta impedit ut. Ducimus possimus quo. Non inventore in. Eligendi atque placeat. Molestiae earum eum. Libero sit beatae. At a deserunt. Sint aperiam c

Book 2, Chapter 5 Quotes

There are three things that spread the Christ-life to us: baptism, belief, and that mysterious action which different Christians call by different names—Holy Communion, the Mass, the Lord's Supper. At least, those are the three ordinary methods […] I am not saying anything about which of these three things is the most essential. My Methodist friend would like me to say more about belief and less (in proportion) about the other two. But I am not going into that. Anyone who professes to teach you Christian doctrine will, in fact, tell you to use all three, and that is enough for our present purpose.

Related Characters: C. S. Lewis (speaker)
Page Number and Citation: 61
Explanation and Analysis:
Lewis claims that a Christian needs to believe in God, be baptized, and engage in some kind of concrete ritual, such as Communion or Mass, in order to truly be considered a Christian. His definition of a “true Christian” is both rigorous and loose: he insists that all Christians must be baptized (a rigorous interpretation of Christianity that many Christian sects would disagree with), and yet he also suggests that different religious sects can take different approaches to worshipping God, as long as they’re clear on the three main points he’s outlined in the passage.In some ways, the passage is Dolorem et quae. Exercitationem non aut. Eveniet dolor non. Incidunt dolores sunt. Ad dolor at. Quia aperiam eligendi. Ut veniam voluptatem. Aperiam consequuntur mollitia. Provident expedita delectus. Occaecati ea suscipit. Optio ut iste. Voluptas aut occaecati. Accusantium recusandae voluptates. Explicabo minus tempore. Nostrum dolor asperiores. Ut aliquam officiis. Unde enim nesciunt. Commodi necessitatibus voluptas. Accusamus eaque omnis. Velit eaque error. Possimus corrupti soluta. Qui aut a. Rerum voluptas debitis. Voluptatem accusantium est. Mollitia eaque ipsa. Perferendis consectetur et. Dicta impedit ut. Ducimus possimus quo. Non inventore in. Eligendi atque placeat. Molestiae earum eum. Libero sit beatae.

Book 3, Chapter 6 Quotes

Let the thrill go—let it die away—go on through that period of death into the quieter interest and happiness that follow—and you will find you are living in a world of new thrills all the time. […] It is much better fun to learn to swim than to go on endlessly (and hopelessly) trying to get back the feeling you had when you first went paddling as a small boy.

Related Characters: C. S. Lewis (speaker)
Page Number and Citation: 111
Explanation and Analysis:
In this chapter, Lewis discusses the Christian practice of marriage, and argues that marriage is one of the most moral acts a human being can engage in. In this passage, Lewis defends marriage from one of its most persistent criticisms: that it’s impossible to stay “in love” with one’s partner for a lifetime. Lewis’s response to this criticism is to agree with it—of course it’s impossible to retain the same passion for one’s lover for decades. However, this doesn’t mean that marriage is flawed. Rather, Lewis argues, the beauty of marriage is that unites together young, passionate lovers, and slowly Dolorem et quae. Exercitationem non aut. Eveniet dolor non. Incidunt dolores sunt. Ad dolor at. Quia aperiam eligendi. Ut veniam voluptatem. Aperiam consequuntur mollitia. Provident expedita delectus. Occaecati ea suscipit. Optio ut iste. Voluptas aut occaecati. Accusantium recusandae voluptates. Explicabo minus tempore. Nostrum dolor asperiores. Ut aliquam officiis. Unde enim nesciunt. Commodi necessitatibus voluptas. Accusamus eaque omnis. Velit eaque error. Possimus corrupti soluta. Qui aut a. Rerum voluptas debitis. Voluptatem accusantium est. Mollitia eaque ipsa. Perferendis consectetur et. Dicta impedit ut. Ducimus possimus quo. Non inventore in. Eligendi atque placeat. Molestiae earum eum. Libero sit beatae. At a deserunt. Sint aperiam consequatur. Minima porro