 In order to make the needed link from epistemology to mind plausible, the linking premise and the rest of the argument need to be refined right away. The strategy is to trace variation of degrees in justification to variations of degrees in experience, but rival candidates for explaining the variation need to be blocked. For all we have said so far, the variation in degrees of justification could be traced not to experiences, but rather to differing degrees of justification to believe that your experiences are trustworthy (depending on the conditions of fog).