Sometimes one pays most for things one gets for nothing.

Great men are simply men and are not to be considered from the point of view of nationality, nor should the environment in which they were brought up be taken into account.

Homosexuality should not be punishable except to protect children.

One should keep in mind that on average the moral qualities of people do not differ much from country to country.

Children don’t heed the life experiences of their parents, and nations ignore history. Bad lessons always have to be learned anew.

Life is a great tapestry. The individual is only an insignificant thread in an immense and miraculous pattern.

I believe that all creatures who can have young ones together are very much the same.

The discovery of a nuclear chain reaction need not bring about the destruction of mankind any more than the discovery of matches.

The unified field theory has been put into retirement. It is so difficult to employ mathematically that I have not been able to verify it somehow, in spite of all my efforts. This state of affairs will no doubt last many more years, mostly because physicists have little understanding of logical-philosophical arguments.

I also believe that capitalism or, we should say, the system of free enterprise will prove unable to check unemployment, which will become increasingly chronic because of technological progress, and unable to maintain a healthy balance between production and the purchasing power of the people.