Dr Michael Huemer has brought together arguments and added his own to show knowledge can not be based only on sense perception and not only on reason. Thus you would think that knowledge needs both,-- or perhaps a better approach is that of Dr Kelley Ross [the Kant- Fries School of thought] that there is a deeper source of knowledge that is neither based on reason nor the senses.
It occurred to me that this might very well answer a question in the Critique of Pure Reason where Kant shows that there must be a connection between the categories [of pure reason] and the sense perception data that comes in. [That he calls the Transcendental Deduction.] Yet it has been a source of difficulty to see that just because something Must Be So, why should it be so? [I mean that the data from the senses must be ordered by Reason,-- but how?
I think Dr Kelley Ross based on Kant, Fries, and Leonard Nelson shows this well.
[Hegel thinks that Being leads up to Logos. That is the structure of his whole system. [like Plotinus] So he surely believes there is this connection, but he has a different answer --that even sense perception is thought. His idea of what "thought" is a wider than the Hume definition that it is only what can be derived by definitions. You can see this approach in Cunningham in his thesis in 1910. But more than that, you might note that Hume's limitation on reason is assumed, but never proved. [as Bryan Caplan noted] (in: An Enquiry Concerning Hume's Misunderstanding ). He just says over and over that reason alone can only tell us about self contradictions of deductions from axioms. Something he learned from Euclid. As Kant showed that is not true. There are apriori truths not based on definitions. It does seem hard to see why it took such a long time for the implications of Fries and Nelson to be put together in a systematic way by Kelley Ross.--but I guess that is just the way things turned out.
The implication of all this is simple--it gives justification of faith. And it also shows the approach of the mediaevals -that reason tells us what to believe in. [Not that there is just faith and reason in the Middle Ages, but that reason tells us what to believe in. ]
See Maverick Philosopher who hold the same way but not in so many words.
