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

No paradox, no progress.

The opposite of every great idea is another great idea.

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.

If anybody says he can think about quantum physics without getting giddy, that only shows he has not understood the first thing about them.

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

If you think you understand it, that only shows that you don't know the first thing about it.