Karl Popper Quotes

No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.

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

No book can ever be finished. While working on it we learn just enough to find it immature the moment we turn away from it

The most we can say of democracy or freedom is that they give our personal abilities a little more influence on our well-being.

It is not the consciousness of man that determines his existence – rather, it is his social existence that determines his consciousness.

It is wrong to think that belief in freedom always leads to victory; we must always be prepared for it to lead to defeat. If we choose freedom, then we must be prepared to perish along with it.

The wise man belongs to all countries, for the home of a great soul is the whole world.

We must regard all laws or theories as hypothetical or conjectural; that is, as guesses.

Always remember that it is impossible to speak in such a way that you cannot be misunderstood: there will always be some who misunderstand you.

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