If you think you understand it, that only shows that you don't know the first thing about it.
Niels BohrWhen 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.
Niels BohrYou must come to Copenhagen to work with us. We like people who can actually perform thought experiments!
Niels BohrAnd anyone who thinks they can talk about quantum theory without feeling dizzy hasn't yet understood the first thing about it.
Niels Bohr