Heather Battaly

The recent literature on ad hominem argument contends that the speaker’s character is sometimes relevant to evaluating what she says. This effort to redeem ad hominems requires an analysis of character that explains why and how character is relevant. I argue that virtue epistemology supplies this analysis. Three sorts of ad hominems that attack the speaker’s intellectual character are legitimate. They attack a speaker’s: (1) possession of reliabilist vices; or (2) possession of responsibilist vices; or (3) failure to perform intellectually virtuous acts. Legitimate ad hominems conclude that we should not believe what a speaker says solely on her say-so.

I argue in this essay that there is an epistemic analogue of moral self-indulgence. Section 1 analyzes Aristotle's notion of moral temperance, and its corresponding vices of self-indulgence and insensibility. Section 2 uses Aristotle's notion of moral self-indulgence as a model for epistemic self-indulgence. I argue that one is epistemically self-indulgent only if one either : (ESI1) desires, consumes, and enjoys appropriate and inappropriate epistemic objects; or (ESI2) desires, consumes, and enjoys epistemic objects at appropriate and inappropriate times; or (ESI3) desires and enjoys epistemic objects too frequently, or to an inappropriately high degree, or consumes too much of them. We need not look far to locate the epistemically self-indulgent: philosophers, especially skeptics, are likely candidates.