Believing on trust

The aim of the paper is to propose a way in which believing on trust can ground doxastic justification and knowledge. My focus will be the notion of trust that plays the role depicted by such cases as concerned Hardwig (J Philos 82:335–49, 1985; J Philos 88:693–708, 1991) in his early papers, papers that are often referenced in recent debates in social epistemology. My primary aim is not exegetical, but since it sometimes not so clear what Hardwig’s claims are, I offer some remarks of interpretation that might be of interest. The main purpose of the paper, however, is this: following various cues in Hardwig’s writing, I specify certain epistemic properties of agents in social systems, such that, roughly speaking, for agents to know (or be justified in believing) what the ‘system knows’, social relations of epistemic trust between agents in the system are necessary. I will suggest that we can view this social form of epistemic trust as non-inferential dispositions to believe what some individual or other source of information asserts or transmits. When this disposition is discriminating and defeater-sensitive, it can ground knowledge and justification. Or, more cautiously, we should be sympathetic to this view if we are inclined to accept the core insight of process reliabilism. Finally, I will offer some remarks about how epistemic trust and epistemic reasons may relate on this picture.