Full Idea
The notion of a merely possible object is an even more defective notion than the notion of a borderline object; after all, a merely possible object is an object that definitely isn't there.
Gist of Idea
A merely possible object clearly isn't there, so that is a defective notion
Source
Peter van Inwagen (Material Beings [1990], 19)
Book Reference
Inwagen,Peter van: 'Material Beings' [Cornell 1995], p.274