Quotes by: Karl Popper

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Sir Karl Popper
Karl Popper c. 1980s
Born Karl Raimund Popper
(1902-07-28)28 July 1902
Vienna, Austria-Hungary
Died 17 September 1994(1994-09-17) (aged 92)
London, England, United Kingdom
Nationality Austrian
British
Alma mater University of Vienna
Era 20th-century philosophy
Region Western philosophy
School
Critical rationalism Realism[1] Liberalism
Main interests
Epistemology Rationality Philosophy of science Logic Social and political philosophy Metaphysics Philosophy of mind Origin of life Interpretation of Quantum mechanics
Notable ideas
Bold hypothesis Critical rationalism Falsificationism Evolutionary trial and error view of the growth of knowledge Propensity interpretation Open society Cosmological pluralism Modified essentialism Axiomatization of probability Active Darwinism Spearhead model of evolution Objective hermeneutics The paradox of tolerance Critical dualism (of facts and standards) Experimental corroboration as an indicator of verisimilitude/truthlikeness Basissatz (basic statement) Popper's experiment The historicism–historism distinction Negative utilitarianism

No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.
Karl Popper
Whenever a theory appears to you as the only possible one, take this as a sign that you have neither understood the theory nor the problem which it was intended to solve.
Karl Popper
Piecemeal social engineering resembles physical engineering in regarding the ends as beyond the province of technology.
Karl Popper
Our knowledge can only be finite, while our ignorance must necessarily be infinite.
Karl Popper
We have become makers of our fate when we have ceased to pose as its prophets.
Karl Popper
There is no history of mankind, there are only many histories of all kinds of aspects of human life. And one of these is the history of political power. This is elevated into the history of the world.
Karl Popper
In so far as a scientific statement speaks about reality, it must be falsifiable; and in so far as it is not falsifiable, it does not speak about reality.
Karl Popper
We must plan for freedom, and not only for security, if for no other reason than that only freedom can make security secure.
Karl Popper
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