An expert is a man who has made all the mistakes which can be made, in a narrow field.

It is the hallmark of any deep truth that its negation is also a deep truth.

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.

Every sentence I utter must be understood not as an affirmation, but as a question.

Physics is the belief that a simple and consistent description of nature is possible.

It is wrong to think that the task of physics is to find out how nature is. Physics concerns what we say about nature.

Accuracy and clarity of statement are mutually exclusive.