C.S. Lewis was one of the most brilliant writers who ever set pen to paper. He was an insightful thinker, had remarkable common sense, and there may not have been anyone in the last century who was a better writer about the Christian faith and the human condition. In honor of a great man, here are his 25 greatest quotes.

25) Education without values, as useful as it is, seems rather to make man a more clever devil. - C.S. Lewis

24) If anyone says that sex, in itself, is bad, Christianity contradicts him at once. But, of course, when people say, “Sex is nothing to be ashamed of,” they may mean “the state into which the sexual instinct has now got is nothing to be ashamed of.” If they mean that, I think they are wrong. I think it is everything to be ashamed of. There is nothing to be ashamed of in enjoying your food: there would be everything to be ashamed of if half the world made food the main interest of their lives and spent their time looking at pictures of food and dribbling and smacking their lips.- C.S. Lewis

23) Even in literature and art, no man who bothers about originality will ever be original: whereas if you simply try to tell the truth (without caring twopence how often it has been told before) you will, nine times out of ten, become original without ever having noticed it.- C.S. Lewis

22) The world does not consist of 100 percent Christians and 100 percent non-Christians. There are people (a great many of them) who are slowly ceasing to be Christians but who still call themselves by that name: some of them are clergymen. There are other people who are slowly becoming Christians though they do not yet call themselves so.- C.S. Lewis

21) The greatest evil is not now done in those sordid "dens of crime" that Dickens loved to paint. It is not done even in concentration camps and labour camps. In those we see its final result. But it is conceived and ordered (moved, seconded, carried, and minuted) in clean, carpeted, warmed, and well-lighted offices, by quiet men with white collars and cut fingernails and smooth-shaven cheeks who do not need to raise their voice.- C.S. Lewis

20) A cold, self-righteous prig who goes regularly to church may be far nearer to Hell than a prostitute.- C.S. Lewis

19) No man who says I’m as good as you believes it. He would not say it if he did. The St. Bernard never says it to the toy dog, nor the scholar to the dunce, nor the employable to the bum, nor the pretty woman to the plain. The claim to equality, outside the strictly political field, is made only by those who feel themselves to be in some way inferior. What it expresses is precisely the itching, smarting, writhing awareness of an inferiority that the patient refuses to accept. And therefore resents.- C.S. Lewis

18) You can put this another way by saying that while in other sciences the instruments you use are things external to yourself (things like microscopes and telescopes), the instrument through which you see God is your whole self. And if a man's self is not kept clean and bright, his glimpse of God will be blurred — like the Moon seen through a dirty telescope. That is why horrible nations have horrible religions: they have been looking at God through a dirty lens.- C.S. Lewis

17) There are only two kinds of people in the end: those who say to God, “Thy will be done,” and those to whom God says, in the end, “Thy will be done.” All that are in Hell chose it.- C.S. Lewis

16) God whispers to us in our pleasures, speaks to us in our conscience, but shouts in our pains: It is His megaphone to rouse a deaf world.- C.S. Lewis

15) I believe in Christianity as I believe that the sun has risen: not only because I see it, but because by it I see everything else.- C.S. Lewis

14) What saves a man is to take a step. Then another step.- C.S. Lewis

13) A man can no more diminish God's glory by refusing to worship Him than a lunatic can put out the sun by scribbling the word “darkness” on the walls of his cell.- C.S. Lewis

12) To love at all is to be vulnerable. Love anything, and your heart will certainly be wrung and possibly be broken. If you want to make sure of keeping it intact, you must give your heart to no one, not even to an animal. Wrap it carefully round with hobbies and little luxuries; avoid all entanglements; lock it up safe in the casket or coffin of your selfishness. But in that casket — safe, dark, motionless, airless — it will change. It will not be broken; it will become unbreakable, impenetrable, irredeemable.- C.S. Lewis

11) The safest road to Hell is the gradual one — the gentle slope, soft underfoot, without sudden turnings, without milestones, without signposts.- C.S. Lewis

10) Courage is not simply one of the virtues, but the form of every virtue at the testing point.- C.S. Lewis

9) All you then have to do is keep out of his mind the question, “If I, being what I am, can consider that I am in some sense a Christian, why should the different vices of those people in the next pew prove that their religion is mere hypocrisy and convention?”- C.S. Lewis

8) You must show that a man is wrong before you start explaining why he is wrong. The modern method is to assume without discussion that he is wrong and then distract his attention from this (the only real issue) by busily explaining how he became so silly. In the course of the last fifteen years I have found this vice so common that I have had to invent a name for it. I call it “Bulverism.” Some day I am going to write the biography of its imaginary inventor, Ezekiel Bulver, whose destiny was determined at the age of five when he heard his mother say to his father—who had been maintaining that two sides of a triangle were together greater than a third — ”Oh you say that because you are a man.” “At that moment,” E. Bulver assures us, “there flashed across my opening mind the great truth that refutation is no necessary part of argument. Assume that your opponent is wrong, and the world will be at your feet. Attempt to prove that he is wrong or (worse still) try to find out whether he is wrong or right, and the national dynamism of our age will thrust you to the wall.” That is how Bulver became one of the makers of the Twentieth Century.- C.S. Lewis

7) You cannot make men good by law: and without good men you cannot have a good society.- C.S. Lewis

6) Whatever men expect, they soon come to think they have a right to: the sense of disappointment can, with very little skill on (the devil's) part, be turned into a sense of injury.- C.S. Lewis

5) If you look for truth, you may find comfort in the end; if you look for comfort you will not get either comfort or truth only soft soap and wishful thinking to begin, and in the end, despair.- C.S. Lewis

4) We make men without chests and expect of them virtue and enterprise. We laugh at honour and are shocked to find traitors in our midst.- C.S. Lewis

3) If you are on the wrong road, progress means doing an about-turn and walking back to the right road; and in that case the man who turns back soonest is the most progressive man.- C.S. Lewis

2) Affection is responsible for nine-tenths of whatever solid and durable happiness there is in our lives.- C.S. Lewis

1) Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive.- C.S. Lewis