People will not disarm step by step; they will disarm at one blow or not at all.

I regard class differences as contrary to justice and, in the last resort, based on force.

Mankind must give up war in the Atomic Era. What is at stake is the life or death of humanity.

I consider it important, indeed urgently necessary, for intellectual workers to get together, both to protect their own economic status and, also, generally speaking, to secure their influence in the political field.

I am content in my later years. I have kept my good humor and take neither myself nor the next person seriously.

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

Since I have introduced this term I had always a bad conscience. . . . I cannot help to feel it strongly and I am unable to believe that such an ugly thing should be realized in nature.