Full Idea
Coming to convince myself is actually to form a pretend communal belief with pretend others, ..which is clearly parasitic on the case where the others are real.
Gist of Idea
Private justification is justification to imagined other people
Source
Martin Kusch (Knowledge by Agreement [2002], Ch.11)
Book Reference
Kusch,Martin: 'Knowledge by Agreement' [OUP 2004], p.148
A Reaction
This slightly desperate move is a way for 'communitarian' epistemologists to deal with Robinson Crusoe cases. I think Kusch is right, but it is a bit hard to prove that this is what is 'actually' going on.