Full Idea
Content externalism threatens the idea of first-person authority in all its forms, and does so because it calls into question the idea that the access we have to our own mental states is privileged in the way required for such authority.
Clarification
'Externalism' says thoughts are not simply inside the head
Gist of Idea
Content externalism implies that we do not have privileged access to our own minds
Source
Mark Rowlands (Externalism [2003], Ch.7)
Book Reference
Rowlands,Mark: 'Externalism' [Acumen 2003], p.141
A Reaction
I am inclined to respond by saying that since we clearly have privileged access to our own minds, that means there must be something wrong with content externalism.