  We have isolated three different forms of internalism regarding justification, and it is natural to ask how, if at all, they might be related to one another. Accessibility internalism, for example, seems to be strongly related to mentalism. If we ask, what might qualify as accessible by reflection, it is difficult to see what else there might be except for one's own mental states. The relationship between these two forms of internalism is not apt to be entailment; for, it is at least conceivable that one has access via reflection to some state of affairs in the non-mental world. Still, we may safely say that if accessibility internalism is true, this is evidence in favor of mentalism.