If an idea does not appear bizarre, there is no hope for it.

Accuracy and clarity of statement are mutually exclusive.

Your theory is crazy, but it's not crazy enough to be true.

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

When it comes to atoms, language can be used only as in poetry. The poet, too, is not nearly so concerned with describing facts as with creating images and establishing mental connections.

Of course I don't believe in it [pointing to horseshoe on his office wall]. But I understand that it brings you luck whether you believe in it or not.

It is very difficult to make an accurate prediction, especially about the future.