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

[To] interpret Parmenides as a Kant before Kant ... this is exactly what we must do.

Serious rational criticism is so rare that it should be encouraged. Being too ready to defend oneself is more dangerous than being too ready to admit a mistake.

Better our hypotheses die for our errors than ourselves.

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

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

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