--- title: "15 Knows Quotes By Karl Popper" description: "15 Knows quotes by Karl Popper. Plus more from Karl Popper and more Knows sayings from other authors." image: "https://sms4smile.com/quotes/i/ad4/karl-popper-2167_inspirational_we-do-not-know-we-can-only-guess-1775767_1775767.jpg" --- > [We do not know. We can only guess.](https://sms4smile.com/quotes/karl-popper/we-do-not-know-we-can-only-guess/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/ad4/karl-popper-2167_inspirational_we-do-not-know-we-can-only-guess-1775767_1775767.jpg) > [We never know what we are talking about.](https://sms4smile.com/quotes/karl-popper/we-never-know-what-we-are-talking-about/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/993/karl-popper-2167_funny_we-never-know-what-we-are-talking-about_1763763.jpg) > [If you know that things are bound to happen whatever you do, then you may feel free to give up the fight…](https://sms4smile.com/quotes/karl-popper/if-you-know-that-things-are-bound-to-happen-whatever-you-do-then-you/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/3d8/karl-popper-2167_bound_if-you-know-that-things-are-bound-to-hap_3116258.jpg) > [We do not know anything - this is the first. Therefore, we should be very modest - this is the second. Not…](https://sms4smile.com/quotes/karl-popper/we-do-not-know-anything-this-is-the-first-therefore-we-should-be-very/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/f18/karl-popper-2167_attitude_we-do-not-know-anything-this-is-the-firs_2583915.jpg) > [But some of these theories are so bold that they can clash with reality: they are the testable theories of science. And…](https://sms4smile.com/quotes/karl-popper/but-some-of-these-theories-are-so-bold-that-they-can-clash-with/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/3a3/karl-popper-2167_clash_but-some-of-these-theories-are-so-bold-t_1290592.jpg) > [The more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate will be our knowledge…](https://sms4smile.com/quotes/karl-popper/the-more-we-learn-about-the-world-and-the-deeper-our-learning-the/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/4ea/karl-popper-2167_conscious_the-more-we-learn-about-the-world-and-th_957115.jpg) > [Ignorance is not a simple lack of knowledge but an active aversion to knowledge, the refusal to know, issuing from cowardice, pride,…](https://sms4smile.com/quotes/karl-popper/ignorance-is-not-a-simple-lack-of-knowledge-but-an-active-aversion-to/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/50a/karl-popper-2167_active_ignorance-is-not-a-simple-lack-of-knowle_2519838.jpg) > [It is not his possession of knowledge, of irrefutable truth, that makes the man of science, but his persistent and recklessly critical…](https://sms4smile.com/quotes/karl-popper/it-is-not-his-possession-of-knowledge-of-irrefutable-truth-that-makes/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/8b1/karl-popper-2167_adventure_it-is-not-his-possession-of-knowledge-of_542902.jpg) > [I don't know whether God exists or not. ... Some forms of atheism are arrogant and ignorant and should be rejected, but…](https://sms4smile.com/quotes/karl-popper/i-don-t-know-whether-god-exists-or-not-some-forms-of-atheism-are/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/ef9/karl-popper-2167_agnosticism_i-don-t-know-whether-god-exists-or-not-s_1636866.jpg) > [We know a great deal, but our ignorance is sobering and boundless. With each step forward, with each problem which we solve,…](https://sms4smile.com/quotes/karl-popper/we-know-a-great-deal-but-our-ignorance-is-sobering-and-boundless-with/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/322/karl-popper-2167_all-things_we-know-a-great-deal-but-our-ignorance-i_1625142.jpg) > [When we enter a new situation in life and are confronted by a new person, we bring with us the prejudices of…](https://sms4smile.com/quotes/karl-popper/when-we-enter-a-new-situation-in-life-and-are-confronted-by-a-new/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/a5a/karl-popper-2167_dispelling_when-we-enter-a-new-situation-in-life-an_1484394.jpg) > [I think that we shall have to get accustomed to the idea that we must not look upon science as a 'body…](https://sms4smile.com/quotes/karl-popper/i-think-that-we-shall-have-to-get-accustomed-to-the-idea-that-we-must/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/3be/karl-popper-2167_accustomed_i-think-that-we-shall-have-to-get-accust_3050207.jpg) > [The metaphysical doctrine of determinism simply asserts that all events in this world are fixed, or unalterable, or predetermined. It does not…](https://sms4smile.com/quotes/karl-popper/the-metaphysical-doctrine-of-determinism-simply-asserts-that-all/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/9fd/karl-popper-2167_changed_the-metaphysical-doctrine-of-determinism_810930.jpg) > [Understanding a theory has, indeed, much in common with understanding a human personality. We may know or understand a man's system of…](https://sms4smile.com/quotes/karl-popper/understanding-a-theory-has-indeed-much-in-common-with-understanding-a/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/92e/karl-popper-2167_able_understanding-a-theory-has-indeed-much-i_1647431.jpg) > [The history of science, like the history of all human ideas, is a history of irresponsible dreams, of obstinacy, and of error.…](https://sms4smile.com/quotes/karl-popper/the-history-of-science-like-the-history-of-all-human-ideas-is-a-2/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) [Image](https://sms4smile.com/quotes/i/e41/karl-popper-2167_activity_the-history-of-science-like-the-history_808236.jpg) ## Other authors on Knows ## More by Karl Popper > [Science is not a system of certain, or -established, statements; nor is it a system which steadily advances towards a state of finality... And…](https://sms4smile.com/quotes/karl-popper/science-is-not-a-system-of-certain-or-established-statements-nor-is/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [“As indicated by our example, methodological nominalism is nowadays fairly generally accepted in the natural sciences. The problems of the social sciences, on the…](https://sms4smile.com/quotes/karl-popper/as-indicated-by-our-example-methodological-nominalism-is-nowadays/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [Science is perhaps the only human activity in which errors are systematically criticized and, in time, corrected.](https://sms4smile.com/quotes/karl-popper/science-is-perhaps-the-only-human-activity-in-which-errors-are/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [A system is empirical or scientific only if it is capable of being tested by experience. These considerations suggest that not the verifiability but…](https://sms4smile.com/quotes/karl-popper/a-system-is-empirical-or-scientific-only-if-it-is-capable-of-being/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [Bold ideas, unjustified anticipations, and speculative thought, are our only means for interpreting nature: our only organon, our only instrument, for grasping her. And…](https://sms4smile.com/quotes/karl-popper/bold-ideas-unjustified-anticipations-and-speculative-thought-are-our/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [ \[The aim of science is\] to explain what so far has taken to be an explicans, such as a law of nature. The task… ](https://sms4smile.com/quotes/karl-popper/the-aim-of-science-is-to-explain-what-so-far-has-taken-to-be-an/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [There can be no ultimate statements science: there can be no statements in science which can not be tested, and therefore none which cannot…](https://sms4smile.com/quotes/karl-popper/there-can-be-no-ultimate-statements-science-there-can-be-no/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [Evolution is not a fact. Evolution doesn't even qualify as a theory or as a hypothesis. It is a metaphysical research program, and it…](https://sms4smile.com/quotes/karl-popper/evolution-is-not-a-fact-evolution-doesn-t-even-qualify-as-a-theory-or/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [I am opposed to looking upon logic as a kind of game. ... One might think that it is a matter of choice or…](https://sms4smile.com/quotes/karl-popper/i-am-opposed-to-looking-upon-logic-as-a-kind-of-game-one-might-think/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [The history of science, like the history of all human ideas, is a history of irresponsible dreams, of obstinacy, and of error.](https://sms4smile.com/quotes/karl-popper/the-history-of-science-like-the-history-of-all-human-ideas-is-a/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [Good tests kill flawed theories; we remain alive to guess again.](https://sms4smile.com/quotes/karl-popper/good-tests-kill-flawed-theories-we-remain-alive-to-guess-again/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [There is no pure, disinterested, theory-free observation,](https://sms4smile.com/quotes/karl-popper/there-is-no-pure-disinterested-theory-free-observation/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [We have the right not to tolerate the intolerant. We should tolerate even them whenever we can do so without running a great risk;…](https://sms4smile.com/quotes/karl-popper/we-have-the-right-not-to-tolerate-the-intolerant-we-should-tolerate/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [Better our hypotheses die for our errors than ourselves.](https://sms4smile.com/quotes/karl-popper/better-our-hypotheses-die-for-our-errors-than-ourselves/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) > [“Every time we proceed to explain some conjectural law or theory by a new conjectural theory of a higher degree of universality, we are…](https://sms4smile.com/quotes/karl-popper/every-time-we-proceed-to-explain-some-conjectural-law-or-theory-by-a/) [Karl Popper](https://sms4smile.com/quotes/author/karl-popper/) ```json { "@context": "https://schema.org", "@graph": [ { "@type": "ItemList", "@id": "https://sms4smile.com/quotes/about/knows/karl-popper/#itemlist", "name": "15 Knows Quotes By Karl Popper", "numberOfItems": 15, "itemListElement": [ { "@type": "ListItem", "position": 1, "item": { "@type": "Quotation", "text": "We do not know. 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Therefore, we should be very modest - this is the second. Not to claim that we do know when we do not - this is the third. That's the kind of attitude I'd like to popularize. There is little hope for success.", "creator": { "@type": "Person", "name": "Karl Popper" }, "url": "https://sms4smile.com/quotes/karl-popper/we-do-not-know-anything-this-is-the-first-therefore-we-should-be-very/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/f18/karl-popper-2167_attitude_we-do-not-know-anything-this-is-the-firs_2583915.jpg", "contentUrl": "https://sms4smile.com/quotes/i/f18/karl-popper-2167_attitude_we-do-not-know-anything-this-is-the-firs_2583915.jpg", "url": "https://sms4smile.com/quotes/i/f18/karl-popper-2167_attitude_we-do-not-know-anything-this-is-the-firs_2583915.jpg", "width": 1080, "height": 1080, "caption": "“We do not know anything - this is the first. Therefore, we should be very modest - this is the second. Not…” — Karl Popper", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 5, "item": { "@type": "Quotation", "text": "But some of these theories are so bold that they can clash with reality: they are the testable theories of science. And when they clash, then we know that there is a reality; something that can inform us that our ideas are mistaken.", "creator": { "@type": "Person", "name": "Karl Popper" }, "url": "https://sms4smile.com/quotes/karl-popper/but-some-of-these-theories-are-so-bold-that-they-can-clash-with/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/3a3/karl-popper-2167_clash_but-some-of-these-theories-are-so-bold-t_1290592.jpg", "contentUrl": "https://sms4smile.com/quotes/i/3a3/karl-popper-2167_clash_but-some-of-these-theories-are-so-bold-t_1290592.jpg", "url": "https://sms4smile.com/quotes/i/3a3/karl-popper-2167_clash_but-some-of-these-theories-are-so-bold-t_1290592.jpg", "width": 1080, "height": 1080, "caption": "“But some of these theories are so bold that they can clash with reality: they are the testable theories of…” — Karl Popper", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 6, "item": { "@type": "Quotation", "text": "The more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate will be our knowledge of what we do not know, our knowledge of our ignorance", "creator": { "@type": "Person", "name": "Karl Popper" }, "url": "https://sms4smile.com/quotes/karl-popper/the-more-we-learn-about-the-world-and-the-deeper-our-learning-the/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/4ea/karl-popper-2167_conscious_the-more-we-learn-about-the-world-and-th_957115.jpg", "contentUrl": "https://sms4smile.com/quotes/i/4ea/karl-popper-2167_conscious_the-more-we-learn-about-the-world-and-th_957115.jpg", "url": "https://sms4smile.com/quotes/i/4ea/karl-popper-2167_conscious_the-more-we-learn-about-the-world-and-th_957115.jpg", "width": 1080, "height": 1080, "caption": "“The more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate…” — Karl Popper", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 7, "item": { "@type": "Quotation", "text": "Ignorance is not a simple lack of knowledge but an active aversion to knowledge, the refusal to know, issuing from cowardice, pride, or laziness of mind.", "creator": { "@type": "Person", "name": "Karl Popper" }, "url": "https://sms4smile.com/quotes/karl-popper/ignorance-is-not-a-simple-lack-of-knowledge-but-an-active-aversion-to/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/50a/karl-popper-2167_active_ignorance-is-not-a-simple-lack-of-knowle_2519838.jpg", "contentUrl": "https://sms4smile.com/quotes/i/50a/karl-popper-2167_active_ignorance-is-not-a-simple-lack-of-knowle_2519838.jpg", "url": "https://sms4smile.com/quotes/i/50a/karl-popper-2167_active_ignorance-is-not-a-simple-lack-of-knowle_2519838.jpg", "width": 1080, "height": 1080, "caption": "“Ignorance is not a simple lack of knowledge but an active aversion to knowledge, the refusal to know…” — Karl Popper", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 8, "item": { "@type": "Quotation", "text": "It is not his possession of knowledge, of irrefutable truth, that makes the man of science, but his persistent and recklessly critical quest for truth.", "creator": { "@type": "Person", "name": "Karl Popper" }, "url": "https://sms4smile.com/quotes/karl-popper/it-is-not-his-possession-of-knowledge-of-irrefutable-truth-that-makes/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/8b1/karl-popper-2167_adventure_it-is-not-his-possession-of-knowledge-of_542902.jpg", "contentUrl": "https://sms4smile.com/quotes/i/8b1/karl-popper-2167_adventure_it-is-not-his-possession-of-knowledge-of_542902.jpg", "url": "https://sms4smile.com/quotes/i/8b1/karl-popper-2167_adventure_it-is-not-his-possession-of-knowledge-of_542902.jpg", "width": 1080, "height": 1080, "caption": "“It is not his possession of knowledge, of irrefutable truth, that makes the man of science, but his…” — Karl Popper", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 9, "item": { "@type": "Quotation", "text": "I don't know whether God exists or not. ... Some forms of atheism are arrogant and ignorant and should be rejected, but agnosticism—to admit that we don't know and to search—is all right. ... When I look at what I call the gift of life, I feel a gratitude which is in tune with some religious ideas of God. However, the moment I even speak of it, I am embarrassed that I may do something wrong to God in talking about God.", "creator": { "@type": "Person", "name": "Karl Popper" }, "url": "https://sms4smile.com/quotes/karl-popper/i-don-t-know-whether-god-exists-or-not-some-forms-of-atheism-are/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/ef9/karl-popper-2167_agnosticism_i-don-t-know-whether-god-exists-or-not-s_1636866.jpg", "contentUrl": "https://sms4smile.com/quotes/i/ef9/karl-popper-2167_agnosticism_i-don-t-know-whether-god-exists-or-not-s_1636866.jpg", "url": "https://sms4smile.com/quotes/i/ef9/karl-popper-2167_agnosticism_i-don-t-know-whether-god-exists-or-not-s_1636866.jpg", "width": 1080, "height": 1080, "caption": "“I don't know whether God exists or not. ... Some forms of atheism are arrogant and ignorant and should be…” — Karl Popper", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 10, "item": { "@type": "Quotation", "text": "We know a great deal, but our ignorance is sobering and boundless. With each step forward, with each problem which we solve, we not only discover new and unsolved problems, but we also discover that where we believed that we were standing on firm and safe ground, all things are, in truth, insecure and in a state of flux.", "creator": { "@type": "Person", "name": "Karl Popper" }, "url": "https://sms4smile.com/quotes/karl-popper/we-know-a-great-deal-but-our-ignorance-is-sobering-and-boundless-with/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/322/karl-popper-2167_all-things_we-know-a-great-deal-but-our-ignorance-i_1625142.jpg", "contentUrl": "https://sms4smile.com/quotes/i/322/karl-popper-2167_all-things_we-know-a-great-deal-but-our-ignorance-i_1625142.jpg", "url": "https://sms4smile.com/quotes/i/322/karl-popper-2167_all-things_we-know-a-great-deal-but-our-ignorance-i_1625142.jpg", "width": 1080, "height": 1080, "caption": "“We know a great deal, but our ignorance is sobering and boundless. With each step forward, with each problem…” — Karl Popper", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 11, "item": { "@type": "Quotation", "text": "When we enter a new situation in life and are confronted by a new person, we bring with us the prejudices of the past and our previous experiences of people. These prejudices we project upon the new person. Indeed, getting to know a person is largely a matter of withdrawing projections; of dispelling the smoke screen of what we imagine he is like and replacing it with the reality of what he is actually like.", "creator": { "@type": "Person", "name": "Karl Popper" }, "url": "https://sms4smile.com/quotes/karl-popper/when-we-enter-a-new-situation-in-life-and-are-confronted-by-a-new/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/a5a/karl-popper-2167_dispelling_when-we-enter-a-new-situation-in-life-an_1484394.jpg", "contentUrl": "https://sms4smile.com/quotes/i/a5a/karl-popper-2167_dispelling_when-we-enter-a-new-situation-in-life-an_1484394.jpg", "url": "https://sms4smile.com/quotes/i/a5a/karl-popper-2167_dispelling_when-we-enter-a-new-situation-in-life-an_1484394.jpg", "width": 1080, "height": 1080, "caption": "“When we enter a new situation in life and are confronted by a new person, we bring with us the prejudices of…” — Karl Popper", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 12, "item": { "@type": "Quotation", "text": "I think that we shall have to get accustomed to the idea that we must not look upon science as a 'body of knowledge,' but rather as a system of hypotheses; that is to say, as a system of guesses or anticipations which in principle cannot be justified, but with which we work as long as they stand up to tests, and of which we are never justified in saying that we know they are 'true' or 'more or less certain' or even 'probable.'", "creator": { "@type": "Person", "name": "Karl Popper" }, "url": "https://sms4smile.com/quotes/karl-popper/i-think-that-we-shall-have-to-get-accustomed-to-the-idea-that-we-must/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/3be/karl-popper-2167_accustomed_i-think-that-we-shall-have-to-get-accust_3050207.jpg", "contentUrl": "https://sms4smile.com/quotes/i/3be/karl-popper-2167_accustomed_i-think-that-we-shall-have-to-get-accust_3050207.jpg", "url": "https://sms4smile.com/quotes/i/3be/karl-popper-2167_accustomed_i-think-that-we-shall-have-to-get-accust_3050207.jpg", "width": 1080, "height": 1080, "caption": "“I think that we shall have to get accustomed to the idea that we must not look upon science as a 'body of…” — Karl Popper", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 13, "item": { "@type": "Quotation", "text": "The metaphysical doctrine of determinism simply asserts that all events in this world are fixed, or unalterable, or predetermined. It does not assert that they are known to anybody, or predictable by scientific means. But it asserts that the future is as little changeable as is the past. Everybody knows what we mean when we say that the past cannot be changed. It is in precisely the same sense that the future cannot be changed, according to metaphysical determinism.", "creator": { "@type": "Person", "name": "Karl Popper" }, "url": "https://sms4smile.com/quotes/karl-popper/the-metaphysical-doctrine-of-determinism-simply-asserts-that-all/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/9fd/karl-popper-2167_changed_the-metaphysical-doctrine-of-determinism_810930.jpg", "contentUrl": "https://sms4smile.com/quotes/i/9fd/karl-popper-2167_changed_the-metaphysical-doctrine-of-determinism_810930.jpg", "url": "https://sms4smile.com/quotes/i/9fd/karl-popper-2167_changed_the-metaphysical-doctrine-of-determinism_810930.jpg", "width": 1080, "height": 1080, "caption": "“The metaphysical doctrine of determinism simply asserts that all events in this world are fixed, or…” — Karl Popper", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 14, "item": { "@type": "Quotation", "text": "Understanding a theory has, indeed, much in common with understanding a human personality. We may know or understand a man's system of dispositions pretty well; that is to say, we may be able to predict how he would act in a number of different situations. But since there are infinitely many possible situations, of infinite variety, a full understanding of a man's dispositions does not seem to be possible.", "creator": { "@type": "Person", "name": "Karl Popper" }, "url": "https://sms4smile.com/quotes/karl-popper/understanding-a-theory-has-indeed-much-in-common-with-understanding-a/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/92e/karl-popper-2167_able_understanding-a-theory-has-indeed-much-i_1647431.jpg", "contentUrl": "https://sms4smile.com/quotes/i/92e/karl-popper-2167_able_understanding-a-theory-has-indeed-much-i_1647431.jpg", "url": "https://sms4smile.com/quotes/i/92e/karl-popper-2167_able_understanding-a-theory-has-indeed-much-i_1647431.jpg", "width": 1080, "height": 1080, "caption": "“Understanding a theory has, indeed, much in common with understanding a human personality. We may know or…” — Karl Popper", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 15, "item": { "@type": "Quotation", "text": "The history of science, like the history of all human ideas, is a history of irresponsible dreams, of obstinacy, and of error. But science is one of the very few human activities-perhaps the only one-in which errors are systematically criticized and fairly often, in time, corrected. This is why we can say that, in science, we often learn from our mistakes, and why we can speak clearly and sensibly about making progress there. In most other fields of human endeavour there is change, but rarely progress ... 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