Science is not a system of certain, or -established, statements; nor is it a system which steadily advances towards a state of finality... And our guesses are guided by the unscientific, the metaphysical (though biologically explicable) faith in laws, in regularities which we can uncover-discover. Like Bacon, we might describe our own contemporary science-'the method of reasoning which men now ordinarily apply to nature'-as consisting of 'anticipations, rash and premature' and as 'prejudices'.

We do not know anything - this is the first. Therefore, we should be very modest - this is the second. Not to claim that we do know when we do not - this is the third. That's the kind of attitude I'd like to popularize. There is little hope for success.

I am opposed to looking upon logic as a kind of game. ... One might think that it is a matter of choice or convention which logic one adopts. I disagree with this view.

If you know that things are bound to happen whatever you do, then you may feel free to give up the fight against them.

It can't happen here is always wrong: a dictatorship can happen anywhere.

The quest for precision is analogous to the quest for certainty and both - precision and certainty are impossible to attain.

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