We previously covered the Münchhausen trilemma: an argument that knowledge is impossible because it can never be ultimately justified. Any (true) belief must be based on a good reason in order to be considered knowledge. But the reason is only good if it also is based on a good reason, which is based on a good reason and so on.
Knowledge begins with God (Proverbs 1:7). But what is the mechanism by which we reason to have knowledge of other things? How does our knowledge that the “sun is bright” depend on revelation from God? By what chain of reasoning are we able to know anything about anything? How do we prove our most basic, foundational belief?