...we see a number of sophisticated, yet uneducated, theoreticians who are conversant in the LSZ formalism of the Heisenberg field operators, but do not know why an excited atom radiates, or are ignorant of the quantum theoretic deerivation of Rayleigh's law that accounts for the blueness of the sky.
Modern Quantum Mechanics, Second Edition, Addison-Wesley, 2011.
For me personally, J. J. had long been far more than just a particularly distinguished colleague. It saddens me that we will never again laugh together at physics and physicists and life in general, and that he will not see the success of his last work. But I am happy that it has been brought to fruition.
John S. Bell, Foreword to the First Edition of Modern Quantum Mechanics (1994)