Full Idea
If a speaker indicates something, then in order for others to catch his reference they must know, at some level of generality, what kind of thing is indicated. They must categorise it as event, object, or quality. Thinking about something needs that much.
Gist of Idea
Speakers need the very general category of a thing, if they are to think about it
Source
M.R. Ayers (Individuals without Sortals [1974], Intro)
Book Reference
-: 'Canadian Journal of Philosophy' [-], p.114
A Reaction
Ayers defends the view that such general categories are required, but not the much narrower sortal terms defended by Geach and Wiggins. I'm with Ayers all the way. 'What the hell is that?'