This paper explores the application of hinge epistemology to deep disagreement. Hinge epistemology holds that there is a class of commitments-hinge commitments-which play a fundamental role in the structure of belief and rational evaluation: they are the most basic general 'presuppositions' of our world views which make it possible for us to evaluate certain beliefs or doubts as rational. Deep disagreements seem to crucially involve disagreements over such fundamental commitments. In this paper, I consider pessimism about deep disagreement, the thesis that such disagreements are rationally irresolvable, and ask whether the Wittgensteinian account of deep disagreement-according to which such disagreements are disagreements over hinge commitments-provides adequate support for pessimism. I argue that the answer to this question depends on what hinge commitments are and what our epistemic relation to them is supposed to be. I argue for two core claims. First, that non-epistemic theories of hinge commitments provide adequate support for pessimism. Nevertheless, such theories have highly implausible consequences in the context of deep disagreement. Secondly, at least one epistemic theory of hinge commitments, the entitlement theory, permits optimism about such disagreements. As such, while hinge epistemology is mainly pessimistic about deep disagreement, it doesn't have to be.

What is the nature of deep disagreement? In this paper, I consider two similar albeit seemingly rival answers to this question: the Wittgensteinian theory, according to which deep disagreements are disagreements over hinge propositions, and the fundamental epistemic principle theory, according to which deep disagreements are disagreements over fundamental epistemic principles. I assess these theories against a set of desiderata for a satisfactory theory of deep disagreement, and argue that while the fundamental epistemic principle theory does better than the Wittgensteinian theory on this score, the fundamental epistemic principle theory nevertheless struggles to explain the variety of deep disagreement.

No abstract

An epistemologist tells you that knowledge is more than justified true belief. You trust them and thus come to believe this on the basis of their testimony. Did you thereby come to know that this view is correct? Intuitively, there is something intellectually wrong with forming philosophical beliefs on the basis of testimony, and yet it's hard to see why philosophy should be significantly epistemically different from other areas of inquiry in a way that would fully prohibit belief by testimony. This, I argue, is the puzzle of philosophical testimony. In this paper, I explore the puzzle of philosophical testimony and its ramifications. In particular, I examine the case for pessimism about philosophical testimony-the thesis that philosophical belief on the basis of testimony is impossible or is in some way illegitimateand I argue that it lacks adequate support. I then consider whether the source of the apparent intellectual wrongness of testimonial-based philosophical belief is grounded in non-epistemic norms and goals of philosophical practice itself and argue that such norms are implausible, don't conflict with testimonial-based philosophical belief, or else are mere disciplinary norms, lacking substantial normative force that would make it wrong to form testimonial-based philosophical belief. ---This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

Epistemic rationality seems to permit a more steadfast response to disagreements over our fundamental convictions than it does for our ordinary beliefs. Why is this? This essay explores three answers to this question: web‐of‐belief conservatism, moral encroachment, and hinge theories, and argues that hinge theories do a better job than the alternatives at vindicating the intuition that there is a rationally permissible asymmetry in our responses to disagreements over ordinary beliefs and fundamental convictions. The essay also shows how hinge theorists can explain the existence of moral hinge propositions, which enables them to account for the rational permissibility of being steadfast in response to disagreements over fundamental moral convictions.