Full Idea
If there is no sentence I must hold true if it is to mean what it does, then there is no basis on which to argue that I am entitled to hold it true without evidence.
Gist of Idea
We can't hold a sentence true without evidence if we can't agree which sentence is definitive of it
Source
Paul Boghossian (Analyticity Reconsidered [1996], §III)
Book Reference
-: 'Nous' [-], p.17
A Reaction
He is exploring Quine's view. Truth by convention depends on agreeing which part of the usage of a term constitutes its defining sentence(s), and that may be rather tricky. Boghossian says this slides into the 'dreaded indeterminacy of meaning'.