What I am going to tell you about is what we teach our physics students in the third or fourth year of graduate school . . . It is my task to convince you not to turn away because you don't understand it. You see my physics students don't understand it . . . That is because I don't understand it. Nobody does.
Source: QED, The Strange Theory of Light and Matter, Penguin Books, London, 1990, p 9.
Contributed by: Zaady