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

I have learned more from Hayek than from any other living thinker, except perhaps Alfred Tarski - but not even excepting Russell.

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

Do not allow your dreams of a beautiful world to lure you away from the claims of men who suffer here and now. Our fellow men have a claim to our help; no generation must be sacrificed for the sake of future generations.

I may be wrong and you may be right, and by an effort, we may get nearer to the truth

Contrary to the outstanding work of art, outstanding theory is susceptible to improvements.

A rationalist, as I use the word, is a man who attempts to reach decisions by argument and perhaps, in certain cases, by compromise, rather than by violence. He is a man who would rather be unsuccessful in convincing another man by argument than successful in crushing him by force, by intimidation and threats, or even by persuasive propaganda.