Others were less cautious in their approach to quantum gravity. In their first paper on quantum electrodynamics, Heisenberg and Pauli asserted that:quantization of the gravitational field, which appears to be necessary for physical reasons [in a footnote, they refer to works of Einstein and Klein cited above], may be carried out without any new difficulties by means of a formalism fully analogous to that applied here.Almost seventy years [1999] have elapsed since this casual prediction, and we are still without a quantum theory of gravity!
Well, strictly, Pauli was wrong, rather than not even wrong.
