It is not a lack of real affection that scares me away again and again from marriage. Is it a fear of the comfortable life, of nice furniture, of dishonor that I burden myself with, or even the fear of becoming a contented bourgeois.

The distinctions separating the social classes are false; in the last analysis they rest on force.

I do not believe that civilization will be wiped out in a war fought with the atomic bomb. Perhaps two-thirds of the people of the earth will be killed.

[Ernest Rutherford is]...a second Newton.

One has a feeling that one has a kind of home in this timeless community of human beings that strive for truth. ... I have always believed that Jesus meant by the Kingdom of God the small group scattered all through time of intellectually and ethically valuable people.

All that's different about me is that I still ask the questions most people stopped asking at age five.

One cannot learn so well as by experiencing it oneself.