Zitat des Tages von Karl Popper:
Science may be described as the art of systematic over-simplification.
Science must begin with myths, and with the criticism of myths.
We must plan for freedom, and not only for security, if for no other reason than that only freedom can make security secure.
Those who promise us paradise on earth never produced anything but a hell.
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.
No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.
We have become makers of our fate when we have ceased to pose as its prophets.
Our knowledge can only be finite, while our ignorance must necessarily be infinite.
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.
Piecemeal social engineering resembles physical engineering in regarding the ends as beyond the province of technology.