True ignorance is not the absence of knowledge, but the refusal to acquire it.

- 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 w…

- Karl Popper

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 …

- Karl Popper

I personally call the type of government which can be removed without violence 'democracy,' and the other, 'tyranny.'.

- Karl Popper

You cannot have a rational discussion with a man who prefers shooting you to being convinced by you.

- Karl Popper

The question is not how to get good people to rule; THE QUESTION IS: HOW TO STOP THE POWERFUL from doing as much damage as they can to us.

- Karl Popper

If you can't say it simply and clearly, keep quiet, and keep working on it till you can.

- 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 rea…

- Karl Popper

Those who promise us paradise on earth never produced anything but a hell.

- Karl Popper