Those who promise us paradise on earth never produced anything but a hell. Karl Popper
Science may be described as the art of systematic over-simplification. 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
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
Our knowledge can only be finite, while our ignorance must necessarily be infinite. Karl Popper
Philosophers should consider the fact that the greatest happiness principle can easily be made an excuse for a benevolent dictatorship. We should replace it by a more modest and more realistic principle / the principle that the fight against avoidable misery should be a recognized aim of public policy, while the increase of happiness should be left, in the main, to private initiative. Karl Popper
Science must begin with myths, and with the criticism of myths. Karl Popper
We should therefore claim, in the name of tolerance, the right not to tolerate the intolerant. Karl Popper