When we measure something we are forcing an undetermined, undefined world to assume an experimental value. We are not measuring the world, we are creating it.

How wonderful that we have met with a paradox. Now we have some hope of making progress.

The very nature of the quantum theory ... forces us to regard the space-time coordination and the claim of causality, the union of which characterizes the classical theories, as complementary but exclusive features of the description, symbolizing the idealization of observation and description, respectively.

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.

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

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

Anyone who can contemplate quantum mechanics without getting dizzy hasn't understood it.