You cannot have a rational discussion with a man who prefers shooting you to being convinced by you..

The question is not how to get good people to rule; THE QUESTION IS: HOW TO STOP THE POWERFUL from doing as much damage as they can to us..

If we are not prepared to defend a tolerant society against the onslaught of the intolerant, then the tolerant will be destroyed, and tolerance with ….

If you can't say it simply and clearly, keep quiet, and keep working on it till you can..

The growth of knowledge depends entirely upon disagreement..

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

In so far as a scientific statement speaks about reality, it must be falsifiable; and in so far as it is not falsifiable, it does not speak about rea….

I remained a socialist for several years, even after my rejection of Marxism; and if there could be such a thing as socialism combined with individua….

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

Every intellectual has a very special responsibility. He has the privilege and the opportunity of studying. In return, he owes it to his fellow men (….

The best thing that can happen to a human being us to find a problem, to fall in love with that problem, and to live trying to solve that problem, un….

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 w….

Ignorance is not a simple lack of knowledge but an active aversion to knowledge, the refusal to know, issuing from cowardice, pride, or laziness of m….

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

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 ….

It can't happen here is always wrong: a dictatorship can happen anywhere..

I personally call the type of government which can be removed without violence 'democracy,' and the other, 'tyranny.'..

The only way to test a hypothesis is to look for all the information that disagrees with it..

All life is problem solving.

Every solution of a problem raises new unsolved problems..

We do not know. We can only guess..