" Years after Planck's death in 1947, at the age of 89, his former student and colleague James Franck recalled watching his hopeless struggle 'to avoid quantum theory, whether he could not at least make the influence of quantum theory as little as it could possibly be'.It was clear to Franck that Planck 'was a revolutionary against his own will' who 'finally came to the conclusion, "It doesn't help. We have to live with quantum theory. And believe me, it will expand."' It was a fitting epitaph for a reluctant revolutionary. "

― Manjit Kumar, , Quantum: Einstein, Bohr and the Great Debate About the Nature of Reality