All we can do is search for the falsity content in our best theory.

Our knowledge can only be finite, while our ignorance must necessarily be infinite.

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

For myself, I am interested in science and in philosophy only because I want to learn something about the riddle of the world in which we live, and the riddle of man's knowledge of that world. And I believe that only a revival of interest in these riddles can save the sciences and philosophy from an obscurantist faith in the expert's special skill and in his personal knowledge and authority.

The defence of democracy must consist in making anti-democratic experiences too costly for those who try them; much more costly than a democratic compromise

[The aim of science is] to explain what so far has taken to be an explicans, such as a law of nature. The task of empirical science constantly renews itself. We may go on forever, proceeding to explanations of a higher and higher universality.

The survival value of intelligence is that it allows us to extinct a bad idea, before the idea extincts us.