--- title: "10 Known Quotes By Carl Sagan" description: "10 Known quotes by Carl Sagan. Plus more from Carl Sagan and more Known sayings from other authors." image: "https://sms4smile.com/quotes/i/1d7/carl-sagan-160_certain_except-in-pure-mathematics-nothing-is-kn_3169313.jpg" --- > [Except in pure mathematics, nothing is known for certain (although much is certainly false).](https://sms4smile.com/quotes/carl-sagan/except-in-pure-mathematics-nothing-is-known-for-certain-although-much/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) [Image](https://sms4smile.com/quotes/i/1d7/carl-sagan-160_certain_except-in-pure-mathematics-nothing-is-kn_3169313.jpg) > [Preserve and cherish the pale blue dot, the only home we've ever known.](https://sms4smile.com/quotes/carl-sagan/preserve-and-cherish-the-pale-blue-dot-the-only-home-we-ve-ever-known/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) [Image](https://sms4smile.com/quotes/i/9b7/carl-sagan-160_across-the-universe_preserve-and-cherish-the-pale-blue-dot-t_1834880.jpg) > [GO WHERE YOU'VE NEVER BEEN. Somewhere, something incredible is waiting to be known.](https://sms4smile.com/quotes/carl-sagan/go-where-you-ve-never-been-somewhere-something-incredible-is-waiting/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) [Image](https://sms4smile.com/quotes/i/fd3/carl-sagan-160_incredible_go-where-you-ve-never-been-somewhere-som_3072124.jpg) > [Somewhere, something incredible is waiting to be known.](https://sms4smile.com/quotes/carl-sagan/somewhere-something-incredible-is-waiting-to-be-known/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) [Image](https://sms4smile.com/quotes/i/146/carl-sagan-160_incredible_somewhere-something-incredible-is-waitin_177154.jpg) > [When permitted to listen to alternative opinions and engage in substantive debate, people have been known to change their minds. It can…](https://sms4smile.com/quotes/carl-sagan/when-permitted-to-listen-to-alternative-opinions-and-engage-in/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) [Image](https://sms4smile.com/quotes/i/c62/carl-sagan-160_alternatives_when-permitted-to-listen-to-alternative_2790600.jpg) > [There is a lurking fear that some things are not “meant" to be known, that some inquiries are too dangerous for human…](https://sms4smile.com/quotes/carl-sagan/there-is-a-lurking-fear-that-some-things-are-not-meant-to-be-known-2/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) [Image](https://sms4smile.com/quotes/i/d49/carl-sagan-160_fear_there-is-a-lurking-fear-that-some-things_1101848.jpg) > [“The Apollo pictures of the whole Earth conveyed to multitudes something well known to astronomers: On the scale of the worlds -…](https://sms4smile.com/quotes/carl-sagan/the-apollo-pictures-of-the-whole-earth-conveyed-to-multitudes/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) [Image](https://sms4smile.com/quotes/i/f70/carl-sagan-160_apollo_the-apollo-pictures-of-the-whole-earth-c_1658016.jpg) > [If you look at Earth from space you see a dot, that's here. That's home. That's us. It underscores the responsibility to…](https://sms4smile.com/quotes/carl-sagan/if-you-look-at-earth-from-space-you-see-a-dot-that-s-here-that-s-home/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) [Image](https://sms4smile.com/quotes/i/089/carl-sagan-160_blue_if-you-look-at-earth-from-space-you-see_2199066.jpg) > [That we can now think of no mechanism for astrology is relevant but unconvincing. No mechanism was known, for example, for continental…](https://sms4smile.com/quotes/carl-sagan/that-we-can-now-think-of-no-mechanism-for-astrology-is-relevant-but/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) [Image](https://sms4smile.com/quotes/i/c76/carl-sagan-160_astrology_that-we-can-now-think-of-no-mechanism-fo_1562084.jpg) > [For myself, I like a universe that, includes much that is unknown and, at the same time, much that is knowable. A…](https://sms4smile.com/quotes/carl-sagan/for-myself-i-like-a-universe-that-includes-much-that-is-unknown-and/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) [Image](https://sms4smile.com/quotes/i/d51/carl-sagan-160_boredom_for-myself-i-like-a-universe-that-includ_1580154.jpg) ## Other authors on Known ## More by Carl Sagan > [It is sometimes said that scientists are unromantic, that their passion to figure out robs the world of beauty and mystery. But is it…](https://sms4smile.com/quotes/carl-sagan/it-is-sometimes-said-that-scientists-are-unromantic-that-their/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [The prediction of nuclear winter is drawn not, of course, from any direct experience with the consequences of global nuclear war, but rather from…](https://sms4smile.com/quotes/carl-sagan/the-prediction-of-nuclear-winter-is-drawn-not-of-course-from-any/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [The suppression of uncomfortable ideas may be common in religion or in politics, but it is not the path to knowledge; it has no…](https://sms4smile.com/quotes/carl-sagan/the-suppression-of-uncomfortable-ideas-may-be-common-in-religion-or/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [“Telepathy’ literally means to feel at a distance, just as ‘telephone’ is to hear at a distance and ‘television’ is to see at a…](https://sms4smile.com/quotes/carl-sagan/telepathy-literally-means-to-feel-at-a-distance-just-as-telephone-is/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [“On the scale of worlds—to say nothing of stars or galaxies—humans are inconsequential, a thin film of life on an obscure and solitary lump…](https://sms4smile.com/quotes/carl-sagan/on-the-scale-of-worlds-to-say-nothing-of-stars-or-galaxies-humans-are/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies,…](https://sms4smile.com/quotes/carl-sagan/every-one-of-us-is-in-the-cosmic-perspective-precious-if-a-human/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [In our time, we have sifted the sands of Mars, we have established a presence there, we have fulfilled a century of dreams!](https://sms4smile.com/quotes/carl-sagan/in-our-time-we-have-sifted-the-sands-of-mars-we-have-established-a/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [ “\[ When a religious couple wrote to Sagan about fulfilled prophecies, he wrote back in May 1996 :\] If ‘fulfilled prophecy’ is your criterion,… ](https://sms4smile.com/quotes/carl-sagan/when-a-religious-couple-wrote-to-sagan-about-fulfilled-prophecies-he/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [Don't judge everyone else by your own limited experience.](https://sms4smile.com/quotes/carl-sagan/don-t-judge-everyone-else-by-your-own-limited-experience/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [“Books permit us to voyage through time, to tap the wisdom of our ancestors. The library connects us with the insight and knowledge, painfully…](https://sms4smile.com/quotes/carl-sagan/books-permit-us-to-voyage-through-time-to-tap-the-wisdom-of-our/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [We live on a hunk of rock and metal that circles a humdrum star that is one of 400 billion other stars that make…](https://sms4smile.com/quotes/carl-sagan/we-live-on-a-hunk-of-rock-and-metal-that-circles-a-humdrum-star-that/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [A tiny blue dot set in a sunbeam. Here it is. That's where we live. That's home. We humans are one species and this…](https://sms4smile.com/quotes/carl-sagan/a-tiny-blue-dot-set-in-a-sunbeam-here-it-is-that-s-where-we-live-that/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [Any sufficiently crisp question can be answered by a single binary digit-0 or 1, yes or no.](https://sms4smile.com/quotes/carl-sagan/any-sufficiently-crisp-question-can-be-answered-by-a-single-binary/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [Humans — who enslave, castrate, experiment on, and fillet other animals — have had an understandable penchant for pretending animals do not feel pain.…](https://sms4smile.com/quotes/carl-sagan/humans-who-enslave-castrate-experiment-on-and-fillet-other-animals/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) > [Every star may be a sun to someone.](https://sms4smile.com/quotes/carl-sagan/every-star-may-be-a-sun-to-someone/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) ```json { "@context": "https://schema.org", "@graph": [ { "@type": "ItemList", "@id": "https://sms4smile.com/quotes/about/known/carl-sagan/#itemlist", "name": "10 Known Quotes By Carl Sagan", "numberOfItems": 10, "itemListElement": [ { "@type": "ListItem", "position": 1, "item": { "@type": "Quotation", "text": "Except in pure mathematics, nothing is known for certain (although much is certainly false).", "creator": { "@type": "Person", "name": "Carl Sagan" }, "url": "https://sms4smile.com/quotes/carl-sagan/except-in-pure-mathematics-nothing-is-known-for-certain-although-much/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/1d7/carl-sagan-160_certain_except-in-pure-mathematics-nothing-is-kn_3169313.jpg", "contentUrl": "https://sms4smile.com/quotes/i/1d7/carl-sagan-160_certain_except-in-pure-mathematics-nothing-is-kn_3169313.jpg", "url": "https://sms4smile.com/quotes/i/1d7/carl-sagan-160_certain_except-in-pure-mathematics-nothing-is-kn_3169313.jpg", "width": 1080, "height": 1080, "caption": "“Except in pure mathematics, nothing is known for certain (although much is certainly false).” — Carl Sagan", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 2, "item": { "@type": "Quotation", "text": "Preserve and cherish the pale blue dot, the only home we've ever known.", "creator": { "@type": "Person", "name": "Carl Sagan" }, "url": "https://sms4smile.com/quotes/carl-sagan/preserve-and-cherish-the-pale-blue-dot-the-only-home-we-ve-ever-known/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/9b7/carl-sagan-160_across-the-universe_preserve-and-cherish-the-pale-blue-dot-t_1834880.jpg", "contentUrl": "https://sms4smile.com/quotes/i/9b7/carl-sagan-160_across-the-universe_preserve-and-cherish-the-pale-blue-dot-t_1834880.jpg", "url": "https://sms4smile.com/quotes/i/9b7/carl-sagan-160_across-the-universe_preserve-and-cherish-the-pale-blue-dot-t_1834880.jpg", "width": 1080, "height": 1080, "caption": "“Preserve and cherish the pale blue dot, the only home we've ever known.” — Carl Sagan", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 3, "item": { "@type": "Quotation", "text": "GO WHERE YOU'VE NEVER BEEN. 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Nevertheless, we see that Wegener was right, and those who objected on the grounds of unavailable mechanism were wrong.", "creator": { "@type": "Person", "name": "Carl Sagan" }, "url": "https://sms4smile.com/quotes/carl-sagan/that-we-can-now-think-of-no-mechanism-for-astrology-is-relevant-but/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/c76/carl-sagan-160_astrology_that-we-can-now-think-of-no-mechanism-fo_1562084.jpg", "contentUrl": "https://sms4smile.com/quotes/i/c76/carl-sagan-160_astrology_that-we-can-now-think-of-no-mechanism-fo_1562084.jpg", "url": "https://sms4smile.com/quotes/i/c76/carl-sagan-160_astrology_that-we-can-now-think-of-no-mechanism-fo_1562084.jpg", "width": 1080, "height": 1080, "caption": "“That we can now think of no mechanism for astrology is relevant but unconvincing. 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