--- title: "Meaning & Key Takeaway of: Logic!\" said the Professor half to…" description: "\"“Logic!\" said the Professor half to himself. \"Why don't they teach logic at these schools? There are only three possibilities. Either your sister is te..." image: "https://sms4smile.com/quotes/i/c9a/c-s-lewis-121_telling-lies_logic-said-the-professor-half-to-himself_353876.jpg" --- # Logic!" said the Professor half to himself. "Why don't… ![“Logic!" said the Professor half to himself. "Why don't they teach logic at these schools? There are only three possibilities. Either your sister is telling lies, or she is mad, or she is telling the truth. You know she doesn't tell lies and it is obvious that she is not mad. For the moment then…” quote by C.S. Lewis](https://sms4smile.com/quotes/i/c9a/c-s-lewis-121_telling-lies_logic-said-the-professor-half-to-himself_353876.jpg) [Download](https://sms4smile.com/quotes/i/c9a/c-s-lewis-121_telling-lies_logic-said-the-professor-half-to-himself_353876.jpg) [Open image](https://sms4smile.com/quotes/i/c9a/c-s-lewis-121_telling-lies_logic-said-the-professor-half-to-himself_353876.jpg) > ““Logic!" said the Professor half to himself. "Why don't they teach logic at these schools? There are only three possibilities. Either your sister is telling lies, or she is mad, or she is telling the truth. You know she doesn't tell lies and it is obvious that she is not mad. For the moment then and unless any further evidence turns up, we must assume that she is telling the truth.”” [C.S. Lewis](https://sms4smile.com/quotes/author/c-s-lewis-2/) ## About This Quote This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation. The passage sat the difficulty of reasoning when evidence is limited, highlighting the need to consider all logical possibilities before concluding. **In simple terms:** When facts are scarce, examine all options before deciding. Key Takeaway Consider all possibilities before accepting a claim. Themes logic reasoning critical thinking Mood thoughtful analytical Type philosophical educational When to use this quote - legal analysis - scientific research - every decision making - conflict resolution Key Concepts deductive reasoning epistemology Questions to Reflect On - What evidence would change your conclusion? - How do you handle uncertainty in decisions? A Different Perspective Assuming truth without full evidence can lead to errors. ★ ★ ★ ★ ★ No ratings yet [Lies](https://sms4smile.com/quotes/about/lies/) [Logic](https://sms4smile.com/quotes/about/logic/) [Telling lies](https://sms4smile.com/quotes/about/telling-lies/) [Telling the truth](https://sms4smile.com/quotes/about/telling-the-truth/) [Truth](https://sms4smile.com/quotes/about/truth/) ## Related quotes > [A sister is for telling secrets and making promises that will never be broken.](https://sms4smile.com/quotes/anonymous/a-sister-is-for-telling-secrets-and-making-promises-that-will-never/) [Anonymous](https://sms4smile.com/quotes/author/anonymous/) > [“How are you going to teach logic in a world where everybody talks about the sun setting, when it’s really the horizon rising? \[Cal…](https://sms4smile.com/quotes/howard-whitley-eves/how-are-you-going-to-teach-logic-in-a-world-where-everybody-talks/) [Howard Whitley Eves](https://sms4smile.com/quotes/author/howard-whitley-eves/) > [Why don't they teach logic at these schools?](https://sms4smile.com/quotes/digory-kirke/why-don-t-they-teach-logic-at-these-schools/) Digory Kirke > [It was a lie but he believed in telling lies to people. Truth telling and medicine just didn't go together except in dire emergencies,…](https://sms4smile.com/quotes/mario-puzo/it-was-a-lie-but-he-believed-in-telling-lies-to-people-truth-telling/) [Mario Puzo](https://sms4smile.com/quotes/author/mario-puzo/) > [A lot of people live by telling lies. I live by telling the truth.](https://sms4smile.com/quotes/boosie/a-lot-of-people-live-by-telling-lies-i-live-by-telling-the-truth/) [Boosie](https://sms4smile.com/quotes/author/boosie/) > [If the Republicans will stop telling lies about the Democrats, we will stop telling the truth about them.](https://sms4smile.com/quotes/adlai-e-stevenson/if-the-republicans-will-stop-telling-lies-about-the-democrats-we-will/) [Adlai E. Stevenson](https://sms4smile.com/quotes/author/adlai-e-stevenson/) > [If you stop telling lies about me, I'll stop telling the truth about you.](https://sms4smile.com/quotes/the-forgotten/if-you-stop-telling-lies-about-me-i-ll-stop-telling-the-truth-about/) The Forgotten > [I have been thinking that I would make a proposition to my Republican friends... that if they will stop telling lies about the Democrats,…](https://sms4smile.com/quotes/anonymous/i-have-been-thinking-that-i-would-make-a-proposition-to-my-republican/) [Anonymous](https://sms4smile.com/quotes/author/anonymous/) > [Stop telling lies about me, or I am going to start telling the truth about you!](https://sms4smile.com/quotes/richie-parker/stop-telling-lies-about-me-or-i-am-going-to-start-telling-the-truth/) Richie Parker > [Give him a mask, and he will tell you the truth.](https://sms4smile.com/quotes/oscar-wilde/give-him-a-mask-and-he-will-tell-you-the-truth/) [Oscar Wilde](https://sms4smile.com/quotes/author/oscar-wilde/) > [I offer my opponents a bargain: if they will stop telling lies about us, I will stop telling the truth about them.](https://sms4smile.com/quotes/anonymous/i-offer-my-opponents-a-bargain-if-they-will-stop-telling-lies-about/) [Anonymous](https://sms4smile.com/quotes/author/anonymous/) > [I love you, and because I love you, I would sooner have you hate me for telling you the truth than adore me for…](https://sms4smile.com/quotes/pietro-aretino/i-love-you-and-because-i-love-you-i-would-sooner-have-you-hate-me-for/) [Pietro Aretino](https://sms4smile.com/quotes/author/pietro-aretino/) > [Telling lies is a bit like tiling bathrooms - if you don't know how to do it properly, it's best not to try.](https://sms4smile.com/quotes/tom-holt/telling-lies-is-a-bit-like-tiling-bathrooms-if-you-don-t-know-how-to/) [Tom Holt](https://sms4smile.com/quotes/author/tom-holt/) > [A man should be jailed for telling lies to the young.](https://sms4smile.com/quotes/lillian-hellman/a-man-should-be-jailed-for-telling-lies-to-the-young/) [Lillian Hellman](https://sms4smile.com/quotes/author/lillian-hellman/) > [Telling me lies is easier for you than to tell me the truth? Well me not trusting you is easier than getting hurt by…](https://sms4smile.com/quotes/anonymous/telling-me-lies-is-easier-for-you-than-to-tell-me-the-truth-well-me/) [Anonymous](https://sms4smile.com/quotes/author/anonymous/) ## More by C.S. Lewis > [“At the moment, then, of Man’s victory over Nature, we find the whole human race subjected to some individual men, and those individuals subjected…](https://sms4smile.com/quotes/c-s-lewis-2/at-the-moment-then-of-man-s-victory-over-nature-we-find-the-whole/) [C.S. Lewis](https://sms4smile.com/quotes/author/c-s-lewis-2/) > [“Isn’t it absolutely essential to keep a fierce Left and a fierce Right, both on their toes and each terrified of the other?”](https://sms4smile.com/quotes/c-s-lewis-2/isn-t-it-absolutely-essential-to-keep-a-fierce-left-and-a-fierce/) [C.S. Lewis](https://sms4smile.com/quotes/author/c-s-lewis-2/) > [“All Hell is smaller than one pebble of your earthly world: but it is smaller than one atom of this world, the Real World.…](https://sms4smile.com/quotes/c-s-lewis-2/all-hell-is-smaller-than-one-pebble-of-your-earthly-world-but-it-is/) [C.S. Lewis](https://sms4smile.com/quotes/author/c-s-lewis-2/) > [“the greatest service we can do to education today is to teach fewer subjects. No one has time to do more than a very…](https://sms4smile.com/quotes/c-s-lewis-2/the-greatest-service-we-can-do-to-education-today-is-to-teach-fewer/) [C.S. Lewis](https://sms4smile.com/quotes/author/c-s-lewis-2/) > [“If the Divine call does not make us better, it will make us very much worse. Of all bad men religious bad men are…](https://sms4smile.com/quotes/c-s-lewis-2/if-the-divine-call-does-not-make-us-better-it-will-make-us-very-much/) [C.S. 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Lewis](https://sms4smile.com/quotes/author/c-s-lewis-2/) > [“Then two wonders happened at the same moment. One was that the voice was suddenly joined by other voices; more voices than you could…](https://sms4smile.com/quotes/c-s-lewis-2/then-two-wonders-happened-at-the-same-moment-one-was-that-the-voice/) [C.S. Lewis](https://sms4smile.com/quotes/author/c-s-lewis-2/) > [“Because free will, though it makes evil possible, is also the only thing that makes possible any love or goodness or joy worth having.…](https://sms4smile.com/quotes/c-s-lewis-2/because-free-will-though-it-makes-evil-possible-is-also-the-only/) [C.S. Lewis](https://sms4smile.com/quotes/author/c-s-lewis-2/) > [“Laugh and fear not, creatures. Now that you are no longer dumb and witless, you need not always be grave. For jokes as well…](https://sms4smile.com/quotes/c-s-lewis-2/laugh-and-fear-not-creatures-now-that-you-are-no-longer-dumb-and/) [C.S. 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Lewis](https://sms4smile.com/quotes/author/c-s-lewis-2/) > [“Now the whole offer which Christianity makes is this: that we can, if we let God have His way, come to share in the…](https://sms4smile.com/quotes/c-s-lewis-2/now-the-whole-offer-which-christianity-makes-is-this-that-we-can-if/) [C.S. Lewis](https://sms4smile.com/quotes/author/c-s-lewis-2/) [Explore all 1,165 C.S. Lewis quotes ](https://sms4smile.com/quotes/author/c-s-lewis-2/) ## More Lies quotes > [I'm Fine!, the most common LIE in the world...](https://sms4smile.com/quotes/punkinhead-abhishek/i-m-fine-the-most-common-lie-in-the-world/) [Punkinhead Abhishek](https://sms4smile.com/quotes/author/punkinhead-abhishek/) > [Heaven lies around us in our infancy.](https://sms4smile.com/quotes/william-golding/heaven-lies-around-us-in-our-infancy/) [William Golding](https://sms4smile.com/quotes/author/william-golding/) > [What is history after all? 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