Karl Popper Quotes

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

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

We have become makers of our fate when we have ceased to pose as its prophets. - Karl Popper

Unlimited tolerance must lead to the disappearance of tolerance. If we extend unlimited tolerance even to those who are intolerant, if we are not prepared to defend a tolerant society against the onslaught of the intolerant, then the tolerant will be destroyed, and tolerance with them... We should therefore claim, in the name of tolerance, the right not to tolerate the intolerant. We should claim that any movement preaching intolerance places itself outside the law, and we should consider incitement to intolerance and persecution as criminal, in the same way as we should consider incitement to murder, or to kidnapping, or to the revival of the slave trade, as criminal. - 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

Science must begin with myths, and with the criticism of myths. - Karl Popper

Science may be described as the art of systematic over-simplification. - Karl Popper

Piecemeal social engineering resembles physical engineering in regarding the ends as beyond the province of technology. - Karl Popper

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