This was a really disappointing conclusion. Both Hume and Millican find that their careful, rational analysis led to an inability to justify their beliefs, and instead of questioning their beliefs, or the language they use to explain them, they toss reason out the window, in favor of a subjective and vague method of distinguishing between theories of the imagination (e.g: truth now consists of imaginatory theories that seem 'universal, irresistible'). At this point, they basically say, "Well, I can't justify it to be true, I just know it to be true, and everyone else does too. Besides, what can you do with complete skepticism?" The same argument could be used in favor of God and an infinite variety of theories. Reason stops being reason when you can't justify it reasonably, we have no cause to call processes that rely on 'creative, reading-in to reality' 'reasonable.' Shame.