Full Idea
One might say that the word 'I' can only have a person as its reference.
Gist of Idea
Maybe the word 'I' can only refer to persons
Source
Trenton Merricks (Objects and Persons [2003], §2.IV)
Book Reference
Merricks,Trenton: 'Objects and Persons' [OUP 2003], p.50
A Reaction
To infer the existence of persons from this would be to commit what I think of as the Linguistic Fallacy, of deducing ontology directly from language. We might allow (Dennett fashion) that folk categories require the fiction of persons.