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.

The most important factor for the development of the individual is the structure and the values of the society into which he was born.

The fact is that the culture does not have only positive effects on our intellectual and moral functions but also negative effects.

One cannot fall in love, really; one has to be in love.

One cannot be deeply responsive to the world without being saddened very often.

The danger of the past was that men became slaves. The danger of the future is that man may become robots.

Creativity requires the courage to let go of certainties.