Full Idea
Anyone who takes propositions to be abstract entities owes the rest of us an account of how human beings could interact with such things.
Gist of Idea
If propositions are abstract entities, how do human beings interact with them?
Source
John Heil (Philosophy of Mind [1998], Ch.5)
Book Reference
Heil,John: 'Philosophy of Mind' [Routledge 1998], p.133
A Reaction
He makes this sound impossible, but that would mean that all abstraction is impossible, and there are no such things as ideas and concepts. In the end something has to be miraculous, so let it be our ability to think about abstractions.