Full Idea
If to a referentially opaque context of a variable we apply a quantifier, with the intention that it govern that variable from outside the referentially opaque context, then what we commonly end up with is unintended sense or nonsense.
Gist of Idea
Quantifying into referentially opaque contexts often produces nonsense
Source
Willard Quine (Reference and Modality [1953], §2)
Book Reference
Quine,Willard: 'From a Logical Point of View' [Harper and Row 1963], p.148