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

When searching for harmony in life one must never forget that in the drama of existence we are ourselves both actors and spectators.

Opposites are not contradictory but complementary.

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

There are some things so serious you have to laugh at them.

One thought spectra are marvellous, but it is not possible to make progress there. Just as if you have the wing of a butterfly then certainly it is very regular with the colors and so on, but nobody thought one could get the basis of biology from the coloring of the wing of a butterfly.

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.