The synthesis faith and reason was the major idea of the Middle Ages. Each by itself can get seriously out of kilter. This is a case where faith in the Bible can correct flaws in reason. '' Male and female HE created them.'' [Genesis chapter one].
Reason by itself does not tell us much. To Hume it is confined to analytic propositions. Kant struggled mightily for ten years to answer this approach of Hume, and came up with his justification of synthetic a priori knowledge-which is that it is justified within the realm of possibility of experience. But this approach in itself has been subject to debate until rejected totally by both continental and Anglo American so called ''Analytic philosophy.'' The approach favored by me is the Kant-Friesian School [Leonard Nelson] which rightly shows that reason itself has to have starting principles-otherwise it can not get off the ground. This is by immediate non-intuitive knowledge.
But this problem has been rejected by Michael Huemer who says reason itself recognizes universals, i.e., a priori knowledge. While what he says is quite true, however it leaves the problem of how does reason recognize what principles are more ''reasonable''. What criteria does one have to judge. He depends on probability [of Bayes], but even there one needs criteria to decide what is more reasonable.
The main contenders of the Kant Friesian School of Leonard Nelson were the neo- Kantian and Husserl. The Neo-Kantians have gone into oblivion, and Husserl is incoherent. What does he think?--to boil down a person to discover his essence? That is like boiling down a whale into its constituent atoms to find out what is the essence of a whale. And his method of phenomenology he never got around to defining what exactly it is. No wonder David Hilbert sided with Nelson. And there is a bit of poetic justice in that Husserl was paid back in kind in his efforts to block Nelson from a professorship. [That was when his own student, Heidegger, got Husserl removed from his professorship. Payback is a bitch.
