“The history of science, like the history of all human ideas, is a history of irresponsible dreams, of obstinacy, and of error.… — Karl R. Popper Dreams Copy Share Image
“The principle of the national state, that is to say, the political demand that the territory of every state should coincide with… — Karl R. Popper Politics Copy Share Image
“For Aristotle’s essentialist definitions are the principles from which all our knowledge is derived; they thus contain all our knowledge; and they… — Karl R. Popper Long story Copy Share Image
“When the Marxists say, as they sometimes do, that Marx has proved the uselessness of a counter cycle policy and of similar… — Karl R. Popper Speak the truth Copy Share Image
“My argument against a naive form of empiricism was essentially anticipated by Mark Twain. On his first appointment as a reporter, he… — Karl R. Popper Copy Share Image
“ But are there philosophical problems? The present position of English philosophy - my point of departure - originates, I believe, in… — Karl R. Popper Philosophy Copy Share Image
“It is not the consciousness of man that determines his existence—rather, it is his social existence that determines his consciousness.” — Karl R. Popper Life Copy Share Image
“What I criticize under the name Utopian engineering recommends the reconstruction of society as a whole, i.e. very sweeping changes whose practical… — Karl R. Popper Copy Share Image
“The prolonged use of violence may lead in the end to the loss of freedom, since it is liable to bring about… — Karl R. Popper Freedom Copy Share Image
“And it implies that if we respect truth, we must search for it by persistently searching for our errors: by indefatigable rational… — Karl R. Popper Truth Copy Share Image
“The arguments underlying Marx’s historical prophecy are invalid. His ingenious attempt to draw prophetic conclusions from observations of contemporary economic tendencies failed.… — Karl R. Popper Failure Copy Share Image
“I wish to make it clear that ‘history’ in the sense in which most people speak of it simply does not exist;… — Karl R. Popper History Copy Share Image
“Nationalism appeals to our tribal instincts, to passion and to prejudice, and to our nostalgic desire to be relieved from the strain… — Karl R. Popper Individual responsibility Copy Share Image
“The theory I have in mind is one which does not proceed, as it were, from a doctrine of the intrinsic goodness… — Karl R. Popper Democracy Copy Share Image
“One cannot do justice to Marx without recognizing his sincerity. His open-mindedness, his sense of facts, his distrust of verbiage, and especially… — Karl R. Popper Burning desire Copy Share Image
“It is our duty to help those who need our help; but it cannot be our duty to make others happy, since… — Karl R. Popper Cybersecurity Copy Share Image
“A people ought to fight for the laws of the city as if they were its walls.” — Karl R. Popper Copy Share Image
“Scientific’ Marxism is dead. Its feeling of social responsibility and its love for freedom must survive.” — Karl R. Popper Freedom Copy Share Image
“One particular form of this logical argument is directed against a too naïve version of liberalism, of democracy, and of the principle… — Karl R. Popper Absolute freedom Copy Share Image
“However this may be, it can hardly be doubted that with Justinian’s persecution of non-Christians, heretics, and philosophers (A.D. 529), the dark… — Karl R. Popper Dark ages Copy Share Image
“Unlimited tolerance must lead to the disappearance of tolerance. If we extend unlimited tolerance even to those who are intolerant, if we… — Karl R. Popper Democracy Copy Share Image
“The prophetic element in Marx’s creed was dominant in the minds of his followers. It swept everything else aside, banishing the power… — Karl R. Popper Change the world Copy Share Image
“I found that those of my friends who were admirers of Marx, Freud, and Adler, were impressed by a number of points… — Karl R. Popper Opening your eyes Copy Share Image
“But the secret of intellectual excellence is the spirit of criticism ; it is intellectual independence. And this leads to difficulties which… — Karl R. Popper Freedom Copy Share Image
“Relativism is one of the many crimes committed by intellectuals. It is a betrayal of reason and of humanity.” — Karl R. Popper Copy Share Image
