Ordinary language is totally unsuited for expressing what physics really asserts, since the words of everyday life are not sufficiently abstract. Only mathematics and mathematical logic can say as little as the physicist means to say.

I hold all knowledge that is concerned with things that actually exist - all that is commonly called Science - to be of very slight value compared to the knowledge which, like philosophy and mathematics, is concerned with ideal and eternal objects, and is freed from this miserable world which God has made.

It is undesirable to believe a proposition when there is no ground whatever for supposing it true

Half the useful work in the world consists of combating the harmful work.

I have come to realize that an early symptom of approaching mental illness is the belief that one's work is terribly important. If you consider your work very important you should take a day off.

What men really want is not knowledge but certainty.

Shakespeare . . . If he does not give you delight, you had better ignore him [if you can].