Full Idea
In fiction, 'Once upon a time there was an F who...' obviously does not make an ontological commitment, so Quine says the question of which ontology we accept must be dealt with in terms of the role an ontology plays in a scientific worldview.
Gist of Idea
Fictional quantification has no ontology, so we study ontology through scientific theories
Source
report of Willard Quine (On What There Is [1948]) by Alex Orenstein - W.V. Quine Ch.3
Book Reference
Orenstein,Alex: 'W.V. Quine' [Princeton 2002], p.47
A Reaction
This seems to invite questions about the ontology of people who don't espouse a scientific worldview. If your understanding of the outside world and of the past is created for you by storytellers, you won't be a Quinean.