Einstein, stop telling God what to do!

The opposite of a fact is falsehood, but the opposite of one profound truth may very well be another profound truth.

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

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.

The best weapon of a dictatorship is secrecy, but the best weapon of a democracy should be the weapon of openness.

We all know your idea is crazy. The question is whether it is crazy enough.

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