And anyone who thinks they can talk about quantum theory without feeling dizzy hasn't yet understood the first thing about it.

The meaning of life consists in the fact that it makes no sense to say that life has no meaning.

It is very difficult to make an accurate prediction, especially about the future.

There are trivial truths and the great truths. The opposite of a trivial truth is plainly false. The opposite of a great truth is also true.

You must come to Copenhagen to work with us. We like people who can actually perform thought experiments!

In physics we deal with states of affairs much simpler than those of psychology and yet we again and again learn that our task is not to investigate the essence of things-we do not at all know what this would mean&mash;but to develop those concepts that allow us to speak with each other about the events of nature in a fruitful manner.

It is, indeed, perhaps the greatest prospect of humanistic studies to contribute through an increasing knowledge of the history of cultural development to that gradual removal of prejudices which is the common aim of all science.