While the finish given to our picture of the world by the theory of relativity has already been absorbed into the general scientific consciousness, this has scarcely occurred to the same extent with those aspects of the general problem of knowledge which have been elucidated by the quantum theory.

Prediction is very difficult, especially if it's about the future.

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

If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.

Never express yourself more clearly than you are able to think.