If anybody says he can think about quantum physics without getting giddy, that only shows he has not understood the first thing about them.
Niels BohrOur task is not to penetrate the essence of things, the meaning of which we do not know anyway, but rather to develop concepts which allow us to talk in a productive way about phenomena in nature
Niels BohrThe measurement we get when we measure something is not a property of the thing measured.
Niels Bohr