Full Idea
I hold that the question of the ontological commitment of a theory does not properly arise except as that theory is expressed in classical quantificational form.
Gist of Idea
Ontological commitment of theories only arise if they are classically quantified
Source
Willard Quine (Existence and Quantification [1966], p.106)
Book Reference
Quine,Willard: 'Ontological Relativity and Other Essays' [Columbia 1969], p.106
A Reaction
He is attacking substitutional quantification for its failure to commit. I smell circularity. If it must be quantified in the first-order classical manner, that restricts your ontology to objects before you've even started. Chicken/egg.