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

Our task is not to penetrate the essence of things, the meaning of which we do not know anyway, but rather to develop concepts which allow us to talk in a productive way about phenomena in nature

If an idea does not appear bizarre, there is no hope for it.

Rutherford is a man you can rely on; he comes regularly and enquires how things are going and talks about the smallest details - Rutherford is such an outstanding man and really interested in the work of all the people around him.

One must always do what one really cannot.

In our description of nature the purpose is not to disclose the real essence of the phenomena but only to track down, so far as it is possible, relations between the manifold aspects of our experience.

Prediction is difficult, especially the future.