Creativity requires the courage to let go of certainties.

We substitute, or we rather hide, this fear of real intimacy by a superficial kind of friendliness, which is quite nice, but nevertheless, very shallow.

The more the drive toward life is thwarted, the stronger is the drive toward destruction; the more life is realized, the less is the strength of destructiveness. Destructiveness is the outcome of unlived life.

Happiness is a man's greatest achievement; it is the response of his total personality to a productive orientation toward himself and the world outside.

I would define myself as a Marxian, and that means of course also as a humanist.

The Russians have succeeded in one thing: they have sold the world the idea that they represent socialism and the ideas of Marx,and we have done the greatest service to their propaganda by agreeing that that's what it is.

Happiness is a very proud word of our whole cultural heritage.