Full Idea
We should be suspicious of anyone who embraces the formal apparatus of possible worlds while rejecting the ontology.
Gist of Idea
You can't embrace the formal apparatus of possible worlds, but reject the ontology
Source
John Heil (Philosophy of Mind [1998], Pref)
Book Reference
Heil,John: 'Philosophy of Mind' [Routledge 1998], p.-3
A Reaction
What matters is that good philosophy should not duck the ontological implications of any apparatus. If only embracing the 'ontology of possible worlds' were a simple matter. What makes one world 'close' to another?