There is perhaps no phenomenon which contains so much destructive feeling as moral indignation, which permits envy or to be acted out under the guise of virtue.

We have faith in the potentialities of others, of ourselves, and of mankind because, and only to the degree to which, we have experienced the growth of our own potentialities, the reality of growth in ourselves, the strength of our own power of reason and love.

I would say, compared with the 19th century, compared with most previous history, this is as good or better a society than any which man has ever made. But that doesn't mean it is such a good one.

Only in being productively active can man make sense of his life.

There is only one reality: the act of feeling ourselves in the process of making choices.

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

The aim of life is to be fully born, though its tragedy is that most of us die before we are thus born.