DEMONS AND THE ISOLATION ARGUMENT

Justifying a belief gives reason to think that the belief is true. So our concept of justification contains a 'truth connection'. I canvass a number of proposals for analysing this. In the end, two competing conceptions of the truth connection remain: the first, that justifying a belief makes the belief objectively probable, the second, that justifying a belief makes the belief probable in a world which would make true our other beliefs. I discuss reasons for embracing and rejecting these two versions of the truth connection. Ultimately, the two versions appear to represent distinct but equally plausible conceptions of justification. I conclude by rejecting the proposal that these truth connections respectively capture internalist and externalist conceptions of justification.