I have survived two wars, two wives and Hitler.

I don't know what weapons will be used in the Third World War. But I can tell you what they'll use in the Fourth - rocks!

If you're not sure why you're doing something, you can never do enough of it. Imagination is more important than knowledge.

Experience alone can decide on truth.

The essentials of being a person of my type lies precisely in what they think and how they think, not in what they do. Your thoughts shape you.

I believe that the first step in the setting of a real external world is the formation of the concept of bodily objects and of bodily objects of various kinds.

If you want your children to be intelligent, read them fairy tales. If you want them to be more intelligent, read them more fairy tales.