The approach of the Friesian school [based on Kant, Fries, Nelson]. Fries had an important insight into the need for immediate non intuitive knowledge [or what I would prefer to say that reason recognizes universals--not that it knows them. ] As you can imagine Kant is very great but his Copernican revolution leaves a lot to be desired. That we know synthetic a priori because we have the categories implanted in our minds (space and time and causality). That is in simple language: "I know it because I know it." Or as mothers tell their children, "Why? Because I said SO!"
So as Kelley Ross points out --there is a regress of reasons. Somewhere where reason has to
So Kelley Ross found a ready made system that needed a bit bringing down to earth to show its great implications as he does in his web site the Friesian.
So why was all this ignored? Academic philosophy since then has gone off into all sorts of odd directions. The reason for this is simple--people in professional philosophy are very smart. And they do a lot of reading. This enters them into the strange worlds. So they lose their common sense. And nothing is so important in philosophy as common sense.
[I should add that there is a certain degree of distain for Hegel in the Friesian school which I can not share. But I only read the Logic part of his encyclopedia and Mc Taggart and Cunningham's PhD thesis which gave me a very positive idea of what Hegel is all about. [Neo Platonism while taking Kant into consideration --i.e. how Kant modifies the Neo Platonic approach.] But to my mind, the Kelley Ross Fries approach is a modification of Plato as Dr Ross says himself about Socratic ignorance [we know what we do not know that we know] and Platonic knowledge.
