Quotes by : Karl R. Popper

Whenever a theory appears to you as the only possible one, take this as a sign that you have neither....

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

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

I remained a socialist for several years, even after my rejection of Marxism; and if there could be such....

Aestheticism and radicalism must lead us to jettison reason, and to replace it by a desperate hope for....

Always remember that it is impossible to speak in such a way that you cannot be misunderstood: there....

We all have an unscientific weakness for being always in the right, and this weakness seems to be particularly....

The difficulties connected with my criterion of demarcation (D) are important, but must not be exaggerated.....

Denying realism amounts to megalomania.

It is often asserted that, in view of the situation in quantum theory, object and subject can no longer....