Mark J. Boone

A warranted belief may derive inferential warrant from warranted beliefs which support it. It may possess what I call coherential warrant in virtue of beingconsistent with, or lacking improbability relative to, a large system of warranted beliefs. Finally, it may have foundational warrant, which does not derive from other beliefs at all. I define and distinguish these sources of warrant and explain why all three must be included in the true and complete account of the structure of knowledge, and why the first two sources are significant at all levels of knowledge. Only foundherentism and a weak version of foundationalism can satisfy this criterion. My analysis has significant, and happy, consequences for the epistemological tradition. The project of describing the structure of knowledge is nearly complete. Those who have pronounced the death of epistemology are partially correct, not because epistemology has failed, but because it has been so successful.

Alvin Plantinga’s Warrant and Proper Function gives two major definitions of warrant. One states that reliable cognitive faculties aimed at true belief and functioning properly in the right environment are necessary and sufficient for warrant; the other definition only states that they are necessary. The latter definition is the more important one. There are different kinds of knowledge, and justification is necessary for some beliefs to be warranted. Even a belief warranted by proper function can receive a higher degree of warrant by justification. This implies that natural theology has a useful role within the contours of a Plantingian epistemology. (Please note that the pagination here does not match the pagination in the published edition.)

Each of the degenerating constitutions in Book VIII of Plato's Republic is the result of the disappearance of one of the four cardinal virtues. The failure of wisdom creates a timocracy; the failure of courage, an oligarchy; the failure of moderation, a democracy; the failure of justice, a tyranny. The degeneration shows that the disunited virtues are imperfect, though they have some power to stave off vice. Thus Book VIII implies a unity of the virtues thesis according to which perfect virtues can only exist in a united state, but imperfect simulacra of virtue can exist in a disunited state. Published 2011 in Apeiron: A Journal for Ancient Philosophy and Science. (Please note that the pagination in the uploaded document is not the same as the pagination in the published edition.)