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....

We can all participate in the heritage of man. We all can help to preserve it. And we can all make our....

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

What we need and what we want is to moralize politics, not to politicize morals.

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 more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate....

Denying realism amounts to megalomania.

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