It gives me great pleasure indeed to see the stubbornness of an incorrigible nonconformist warmly acclaimed.

There is a driving force more powerful than steam, electricity and nuclear power: the will.

Nationalism is an infantile disease. It is the measles of mankind.

In a healthy nation there is a kind of dramatic balance between the will of the people and the government, which prevents its degeneration into tyranny.

He who finds a thought that lets us a little deeper into the eternal mystery of nature has been granted great peace.

A country cannot simultaneously prepare and prevent war. I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones. The distinctions separating the social classes are false; in the last analysis they rest on force.

It is true that the grasping of truth is not possible without empirical basis. However, the deeper we penetrate and the more extensive and embracing our theories become the less empirical knowledge is needed to determine those theories.