227 Quotes by Karl Popper

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

Denying realism amounts to megalomania.

The attempt to make heaven on earth invariably produces hell.

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.

Science may be described as the art of systematic oversimplification.

The more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate will be our knowledge of what we do not know; our knowledge of our ignorance. For this indeed, is the main source of our ignorance - the fact that our knowledge can be only finite, while our ignorance must necessarily be infinite.

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

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.

We can all participate in the heritage of man. We all can help to preserve it. And we can all make our own modest contribution to it.We must not as for more.