  In the terms that have been used in this paper, what is gestured toward in step (3) by saying that “justification must be a purely internal affair” is just mentalism as we have construed it. And plainly a form of accessibility internalism is what is being noted in (2), though this argument does not distinguish between whether all or only some of the justifiers (determiners) are to be accessible. The inference from (2) to (3), however, certainly seems to suppose that accessibility internalism implies mentalism, a move that was found questionable earlier in this article.