Full Idea
It would be impossible for anyone to have the concept of a stage who did not already possess the concept of a physical object.
Gist of Idea
You can't have the concept of a 'stage' if you lack the concept of an object
Source
M.R. Ayers (Individuals without Sortals [1974], 'Concl')
Book Reference
-: 'Canadian Journal of Philosophy' [-], p.144