Full Idea
When we have said that predicates apply to objects, we have surely not said enough. The situation cries out for an explanation. Must there not be something specific about the things which allows, indeed ensures, that these predicates apply?
Clarification
'Predicates' are part of language
Gist of Idea
There must be some explanation of why certain predicates are applicable to certain objects
Source
David M. Armstrong (Properties [1992], §1)
Book Reference
'Properties', ed/tr. Mellor,D.H. /Oliver,A [OUP 1997], p.164
A Reaction
A nice challenge to any philosopher who places too much emphasis on language. A random and arbitrary (nominalist?) language simply wouldn't work. Nature has joints.