The belief in a political Utopia is especially dangerous. This is possibly connected with the fact that the search for a better world, like the investigation of our environment, is (if I am correct) one of the oldest and most important of all the instincts.

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

We have become makers of our fate when we have ceased to pose as its prophets.

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

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, unless another problem even more lovable appears.

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

We have the right not to tolerate the intolerant. We should tolerate even them whenever we can do so without running a great risk; but the risk may become so great that we cannot allow ourselves the luxury.