Karl Popper Quotes
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All life is problem solving. — Karl Popper
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"Scientific research is the best method we have for obtaining information about ourselves and about our ignorance." — Karl Popper, In Search of a Better World: Lectures and Essays from Thirty Years, Routledge, 1992, p. 79.
“There are no ultimate sources of knowledge. Every source, every suggestion, is welcome; and every source, every suggestion, is open to critical examination. Except in history, we usually examine the facts themselves rather than the sources of our information.” — Karl R.…
“The first duty of every serious student is to further the growth of knowledge by participating in the search for truth — or in the search for better approximations to the truth. Of course, every student is fallible, as are even the greatest masters — everybody is bound to make…
“Thus I am turning the tables on those who think that observation must precede expectations and problems; and I even assert that for logical reasons, observation cannot be prior to all problems, although obviously it will often be prior to some problems—for example to those…
“My answer is simple: by producing an inadequate solution, and by criticising it. Only in this way can we come to understand the problem. For to understand a problem means to understand its difficulties; and to understand its difficulties means to understand why it is not easily…
“From the point of view of objective knowledge, all theories therefore remain conjectural. From the point of view of practical life, they may be far better discussed, criticized, and tested than anything we are accustomed to act upon, and to regard as certain.” — Karl Popper,…
“The method of science is the method of bold conjectures and ingenious and severe attempts to refute them.” — Karl Popper, Objective Knowledge: An Evolutionary Approach (1972)
"There are all kinds of sources of our knowledge; but none has authority." — Karl Popper.
"How can we hope to detect and eliminate error?' is, I believe, 'By criticizing the theories or guesses of others and--if we can train ourselves to do so--by criticizing our own theories or guesses.' (The latter point is highly desirable, but not indispensable; for if we fail to…
"Good tests kill flawed theories; we remain alive to guess again." — Karl Popper, Objective Knowledge (1972).
“But as a rule, we soon find that our conjectures can be refuted, or that they do not solve our problem, or that they solve it only in part; and we find that even the best solutions—those able to resist the most severe criticism of the most brilliant and ingenious minds—soon give…
"Whenever we propose a solution to a problem, we ought to try as hard as we can to overthrow our solution, rather than defend it. Few of us, unfortunately, practise this precept; but other people, fortunately, will supply the criticism for us if we fail to supply it ourselves."…
"I may be wrong and you may be right, and by an effort, we may get nearer to the truth." –– Karl Popper.
"No rational argument will have a rational effect on a man who does not want to adopt a rational attitude." — Karl Popper, The Open Society and Its Enemies (1945)
"An argument which appeals to the fact that we possess knowledge or that we can learn from experience, and which concludes from this fact that knowledge or learning from experience must be possible, and further, that every theory which entails the impossibility of knowledge, or…
"In science there is progress. That has to do with the fact that science has an aim. Science is the search for truth and its aim is the approximation to the truth." — Karl Popper, In Search of a Better World: Lectures and Essays from Thirty Years, Routledge, 1992, p. 9
"This is the deepest reason for the fallibility of man. Human mistakes are made because one can sometimes give good reasons for a thing to be true, and bad reasons for a thing to be true, but never conclusive reasons for a thing to be true. One cannot generally distinguish…
“Thus I am turning the tables on those who think that observation must precede expectations and problems; and I even assert that for logical reasons, observation cannot be prior to all problems, although obviously it will often be prior to some problems—for example to those…
“We are active, we are constantly testing things out, constantly working with the method of trial and error.” — Karl Popper, All Life Is Problem Solving, p. 52
“The open society is one in which men have learned to be to some extent critical of taboos, and to base decisions on the authority of their own intelligence.” — Karl Popper, The Open Society and Its Enemies, Volume One, Chapter 10, p. 202
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