Karl Raimund Popper: Frasi in inglese

Colin Powell in My American Journey (1995)
Misattributed

Anthony Storr as quoted in The Observer (12 July 1970)
Misattributed

Conjectures and Refutations: The Growth of Scientific Knowledge (1963)

As quoted in Freedom: A New Analysis (1954) by Maurice William Cranston, p. 112

Origine: Conjectures and Refutations: The Growth of Scientific Knowledge (1963), Ch. 1 "Science : Conjectures and Refutations", Section VII

Utopia and Violence (1947)

Vol 2, Ch. 25 "Has History any Meaning?" Variant: 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.
The Open Society and Its Enemies (1945)
Contesto: There is no history of mankind, there is only an indefinite number of 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. But this, I hold, is an offence against every decent conception of mankind. It is hardly better than to treat the history of embezzlement or of robbery or of poisoning as the history of mankind. For the history of power politics is nothing but the history of international crime and mass murder (including it is true, some of the attempts to suppress them). This history is taught in schools, and some of the greatest criminals are extolled as heroes.

Origine: The Logic of Scientific Discovery (1934), Ch. 1 "A Survey of Some Fundamental Problems", Section I: The Problem of Induction
Contesto: A principle of induction would be a statement with the help of which we could put inductive inferences into a logically acceptable form. In the eyes of the upholders of inductive logic, a principle of induction is of supreme importance for scientific method: "… this principle", says Reichenbach, "determines the truth of scientific theories. To eliminate it from science would mean nothing less than to deprive science of the power to decide the truth or falsity of its theories. Without it, clearly, science would no longer have the right to distinguish its theories from the fanciful and arbitrary creations of the poet's mind."
Now this principle of induction cannot be a purely logical truth like a tautology or an analytic statement. Indeed, if there were such a thing as a purely logical principle of induction, there would be no problem of induction; for in this case, all inductive inferences would have to be regarded as purely logical or tautological transformations, just like inferences in inductive logic. Thus the principle of induction must be a synthetic statement; that is, a statement whose negation is not self-contradictory but logically possible. So the question arises why such a principle should be accepted at all, and how we can justify its acceptance on rational grounds.

The Poverty of Historicism (1957) Ch. 29 The Unity of Method
Contesto: If we are uncritical we shall always find what we want: we shall look for, and find, confirmations, and we shall look away from, and not see, whatever might be dangerous to our pet theories. In this way it is only too easy to obtain what appears to be overwhelming evidence in favor of a theory which, if approached critically, would have been refuted.

Preface to the First Edition
The Open Society and Its Enemies (1945)
Contesto: If in this book harsh words are spoken about some of the greatest among the intellectual leaders of mankind, my motive is not, I hope, the wish to belittle them. It springs rather from my conviction that, if our civilization is to survive, we must break with the habit of deference to great men. Great men may make great mistakes; and as the book tries to show, some of the greatest leaders of the past supported the perennial attack on freedom and reason. Their influence, too rarely challenged, continues to mislead those on whose defence civilization depends, and to divide them. The responsibility of this tragic and possibly fatal division becomes ours if we hesitate to be outspoken in our criticism of what admittedly is a part of our intellectual heritage. By reluctance to criticize some of it, we may help to destroy it all.

The Logic of Scientific Discovery (1934)

Introduction; part of this has sometimes been paraphrased : Our civilization has not yet fully recovered from the shock of its birth — the transition from the tribal or 'closed society', with its submission to magical forces, to the 'open society' which sets free the critical powers of man.
The Open Society and Its Enemies (1945)

In Search of a Better World (1984)

Preface
In Search of a Better World (1984)

As quoted by Mark Damazer in "In Our Time's Greatest Philosopher Vote" at In Our Time (BBC 4) http://www.bbc.co.uk/radio4/history/inourtime/greatest_philosopher_celeb.shtml

Vol. 1, Endnotes to the Chapters : Notes to the Introduction.
The Open Society and Its Enemies (1945)

Utopia and Violence (1947)

As quoted in In Passing: Condolences and Complaints on Death, Dying, and Related Disappointments (2005) by Jon Winokur, p. 144

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Unended Quest: An Intellectual Autobiography (1976)