Indeed, we can see the centrality of this conception of justification throughout the history of philosophy, especially in its grappling with the problem of skepticism.
In order to justify denying skeptical claims, we want to know what reason we have for believing that skepticism is false. Such quotations help to illustrate the dominance of the view that justified belief depends upon one’s having good reasons or evidence.
justification, it is a thesis about what it takes for one to believe justifiably, or reasonably, in the sense thought to be necessary for knowledge.
Particular versions of evidentialism can diverge in virtue of their providing different claims about what sorts of things count as evidence, what it is for one to have evidence, and what it is for one’s evidence to support believing a proposition.
Traditional accounts have looked to one’s available evidence or reasons for an answer. Though this by no means settles the issue, it does provide reason to try to work out a theory of justification that appeals to evidence.
Naturally, then, we see this traditional conception reflected in the writings of many influential philosophers. proportions his belief to the evidence,” and he proceeds with this as his epistemic ideal (73). in attaching to every proposition a degree of belief corresponding to its degree of credibility,” credibility functionally depending on evidence (397-398). The remainder of this entry turns toward a detailed consideration of the theory itself.
So understood, evidentialism is not just a thesis about justified belief, it is also a thesis about justified of belief.
Only one doxastic attitude towards a proposition is justified for a person at a time, and this is a function of one’s evidence.
Here, I focus on the core of evidentialism—the thesis about justified belief given in (EVI)—both for simplicity and because most treatments and criticisms of evidentialism focus on it.
What is said about (EVI) can be extended naturally to the rest of the doxastic attitudes and thereby applied to Feldman and Conee’s explicit thesis.