Full Idea
One can identify an object in a mirror as oneself, but that brings with it the possibility of misidentification, so since introspective awareness statements are immune to error, one is not introspectively aware of oneself as an object.
Gist of Idea
We can't introspect ourselves as objects, because that would involve possible error
Source
Quassim Cassam (Introduction to 'Self-Knowledge' [1994], §I)
Book Reference
'Self-Knowledge', ed/tr. Cassam,Quassim [OUP 1994], p.10
A Reaction
As a pure argument this looks weak. There could be two sorts of knowledge of objects, one admitting possible error, the other not. Introspecting pain appears to be awareness of oneself as an object. Planning my future needs my body.