We must plan for freedom, and not only for security, if for no other reason than that only freedom can make security secure.

We must plan for freedom, and not only for security, if for no other reason than that only freedom can make security secure

Our knowledge can only be finite, while our ignorance must necessarily be infinite.

Science must begin with myths, and with the criticism of myths.

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.

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.