Every discovery contains an irrational element or a creative intuition.

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

The growth of knowledge depends entirely upon disagreement.

It is impossible to speak in such a way that you cannot be misunderstood.

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 mind.

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.

Every genuine test of a theory is an attempt to falsify it, or to refute it.