Boredom is nothing but the experience of a paralysis of our productive powers.

I am a socialist. However, I have to add that what I understand by socialism is exactly the opposite of what many people, or most people, today mean by socialism.

The criterion of mental health is not one of individual adjustment to a given social order, but a universal one, valid for all men, of giving a satisfactory answer to the problem of human existence.

Once they are through the process of education, most people lose the capacity of wondering, of being surprised. They feel they ought to know everything, and hence that it is a sign of ignorance to be surprised or puzzled by anything.

I feel worried, deeply worried, only about one thing - the possibility that we fall... that we cannot avoid an atomic war.

Human history began with an act of disobedience and it is not unlikely that it will be terminated by an act of obedience.

The most beautiful as well as the most ugly inclinations of man are not part of a fixed biologically given human nature, but result from the social process which creates man.