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 old scientific ideal of episteme - of absolutely certain, demonstrable knowledge - has proved to be an idol. The demand for scientific objectivity makes it inevitable that every scientific statement must remain tentative for ever.

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

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

No number of sightings of white swans can prove the theory that all swans are white. The sighting of just one black one may disprove it.

It is not his possession of knowledge, of irrefutable truth, that makes the man of science, but his persistent and recklessly critical quest for truth.

Genuine philosophical problems are always rooted outside philosophy and they die if these roots decay.