“...How then do they manage with these incorrect equations? These equations
lead to infinities when one tries to solve them; these infinities ought not to be there.
They remove them artificially. ... Just because the results happen to be in agree-
agreement with observations does not prove that one's theory is correct. After all, the
Bohr theory [of the hydrogen atom] was correct in simple cases. It gave very good
answers, but still the Bohr theory had very wrong concepts.”