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Quotes by Karl Popper


No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.
– Karl Popper
Good tests kill flawed theories; we remain alive to guess again.
– Karl Popper
It is impossible to speak in such a way that you cannot be misunderstood.
– Karl Popper
Our knowledge can only be finite, while our ignorance must necessarily be infinite.
– Karl Popper
Science may be described as the art of systematic over-simplification.
– Karl Popper
Those who promise us paradise on earth never produced anything but a hell.
– 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
Science must begin with myths, and with the criticism of myths.
– Karl Popper
Piecemeal social engineering resembles physical engineering in regarding the ends as beyond the province of technology.
– Karl Popper