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

The present state of atomic theory is characterized by the fact that we not only believe the existence of atoms to be proved beyond a doubt, but also we even believe that we have an intimate knowledge of the constituents of the individual atoms.

The opposite of every great idea is another great idea.

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

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.

The measurement we get when we measure something is not a property of the thing measured.

Oh what idiots we have all been, this is just as it must be