Lewis is an interesting expositor of Christian belief because he claims no special authority for doing so. He writes not as the Pope or an ordained minister, but as a common layman, explaining his religion to his common friends. If anything, Lewis makes it clear that he is as much of a sinner as anyone else. The humble position from which he writes gives his words an authority more powerful than a scholarly title.
I enjoyed Mere Christianity. It was interesting to read from my perspective as a Mormon. I found that, true to the book's goal, there was very little that I disagreed with. I even realized that Ezra Taft Benson's well-known Beware of Pride talk, which I have read many times, was based on Lewis's analysis of the topic, and it quoted his words and ideas at length.
A few favorite quotes from the book (citations from the HarperCollins 2001 edition):
- Becoming: "We might think that God wanted simply obedience to a set of rules: whereas He really wants people of a particular sort." (p. 80)
- Heaven: "The point is not that God will refuse you admission to His eternal world if you have not got certain qualities of character; the point is that if people have not got at least the beginning of those qualities inside them, then no possible external conditions could make a 'Heaven' for them...." (p. 81)
- Charitable giving: "I am afraid the only safe rule is to give more than we can spare.... If our charities do not at all pinch or hamper us, I should say they are too small. There ought to be things we should like to do and cannot do because our charities expediture excludes them." (p. 86)
- Faults: "The devil loves 'curing' a small fault by giving you a great one." (p. 127)
- Humility: "Do not imagine that if you meet a really humble man he will be what most people call 'humble' nowadays: he will not be a short of greasy, smarmy person, who is always telling you that, of course, he is nobody. Probably all you will think about him is that he seemed a cheerful, intelligent chap who took a real interest in what you said to him. If you do dislike him it will be because you feel a little envious of anyone who seems to enjoy life so easily. He will not be thinking about humility: he will not be thinking about himself at all." (p. 128)
- Faith vs. works: "Christians have often disputed as to whether what leads the Christian home is good actions, or Faith in Christ. I have no right really to speak on such a difficult question, but it does seem to me like asking which blade in a pair of scissors is most necessary." (p. 148)
- Those pesky facts: "We cannot compete, in simplicity, with people who are inventing religions. How could we? We are dealing with Fact. Of course anyone can be simple if he has no facts to bother about." (p. 165)
- God's plan for you: "Imagine yourself as a living house. God comes in to rebuild that house. At first, perhaps you can understand what He is doing.... But presently he starts knocking the house about in a way that hurts abominably and does not seem to make sense. What on earth is He up to? The explanation is that He is building quite a different house from the one you thought of.... You thought you were going to be made into a decent little cottage: but He is building a palace." (p. 205)
- Thoughts vs. actions: "Fine feelings, new insights, greater interest in 'religion' mean nothing unless they make our actual behaviour better; just as in an illness 'feeling better' is not much good if the thermometer show that your temperature is still going up." (p. 207)