Jonathan Matheson

The Uniqueness Thesis, or rational uniqueness, claims that a body of evidence severely constrains one’s doxastic options. In particular, it claims that for any body of evidence E and proposition P, E justifies at most one doxastic attitude toward P. In this paper I defend this formulation of the uniqueness thesis and examine the case for its truth. I begin by clarifying my formulation of the Uniqueness Thesis and examining its close relationship to evidentialism. I proceed to give some motivation for this strong epistemic claim and to defend it from several recent objections in the literature. In particular I look at objections to the Uniqueness Thesis coming from considerations of rational disagreement (can’t reasonable people disagree?), the breadth of doxastic attitudes(can’t what is justified by the evidence encompass more than one doxastic attitude?), borderline cases and caution (can’t it be rational to be cautious and suspend judgment even when the evidence slightly supports belief?), vagueness (doesn’t the vagueness of justification spell trouble for the Uniqueness Thesis?), and degrees of belief (doesn’t a finegrained doxastic picture present additional problems for the Uniqueness Thesis?).

While puzzles concerning the epistemic significance of disagreement are typically motivated by looking at the widespread and persistent disagreements we are aware of, almost all of the literature on the epistemic significance of disagreement has focused on cases idealized peer disagreement. This fact might itself be puzzling since it doesn’t seem that we ever encounter disagreements that meet the relevant idealized conditions. In this paper I hope to somewhat rectify this matter. I begin by closely examining what an idealized case of peer disagreement looks like and what the Equal Weight View (EWV) of disagreement claims about the epistemic significance of such disagreements. After briefly defending the verdicts of the EWV in idealized disagreements I proceed to unpack the implications of stripping away the idealized conditions. In doing I show both why it is important to focus on idealized cases of peer disagreement and what we can learn from such cases that applies to the everyday cases of disagreement of which we are very familiar.

Recently there has been a good deal of interest in the relationship between common sense epistemology and Skeptical Theism. Much of the debate has focused on Phenomenal Conservatism and any tension that there might be between it and Skeptical Theism. In this paper I further defend the claim that there is no tension between Phenomenal Conservatism and Skeptical Theism. I show the compatibility of these two views by coupling them with an account of defeat – one that is friendly to both Phenomenal Conservatism and Skeptical Theism. In addition, I argue that this account of defeat can give the Skeptical Theist what she wants – namely a response to the evidential argument from evil that can leave one of its premises unmotivated. In giving this account I also respond to several objections from Trent Dougherty (2011) and Chris Tucker (this volume) as well as to an additional worry coming from the epistemology of disagreement.

Conciliatory views of disagreement are an intuitive class of views on the epistemic significance of disagreement. Such views claim that making conciliation is often required upon discovering that another disagrees with you. One of the chief objections to these views of the epistemic significance of disagreement is that they are self-defeating. Since, there are disagreements about the epistemic significance of disagreement, such views can be turned on themselves, and this has been thought to be problematic. In this paper, I examine several different incarnations of this objection and defend conciliatory views of disagreement from each of them, while making a modification regarding how such views should be understood