Reviewed by: Sextus, Montaigne, Hume: Pyrrhonizers by Brian C. Ribeiro Jerry Green RIBEIRO, Brian C. Sextus, Montaigne, Hume: Pyrrhonizers. Leiden: Brill, 2021. ix + 165 pp. Cloth, $145.00; eBook, $149.00 As the title suggests, this short, engaging work explores a continuity between three major thinkers in the Western skeptical tradition. The label "Pyrrhonizers" is well chosen: What draws Sextus Empiricus, Montaigne, and Hume together is a set of attitudes about the limits of reason and the value of constant inquiry. These thinkers are united not by commitment to a set of propositions that would group them together in some kind of static philosophical school but, rather, by a kind of pessimism about rationality's power. Ribeiro uses these figures to prompt a thought-provoking inversion of a traditional challenge to skepticism: Not only is it possible for a skeptic to live his skepticism, it is also unexpectedly easy to do so, because rationality has a surprisingly weak hold on us. This means that we can continue to be skeptics even when we cannot bring ourselves to believe or reject dogmatic claims, so long as we continue to pyrrhonize. Chapter 1 is a defense of the psychological reality of epistemic akrasia, a phenomenon by which an epistemic agent fails to form beliefs governed by the evidence she takes herself to have (analogous to the more familiar weakness of will in moral psychology). In particular, Ribeiro focuses on skeptical cases where one takes oneself to have sufficient reason to suspend judgment regarding p but nevertheless persists in believing that p. This chapter engages with contemporary literature in epistemology that [End Page 158] denies the possibility of epistemic akrasia; Ribeiro points to real cases of the phenomenon to show that it is an actual occurrence in human psychology. Chapter 2 surveys the three eponymous subjects of the book, arguing that Sextus, Montaigne, and Hume are engaged in a single, historically continuous project regarding epistemic agency and human reason-responsiveness. Whatever differences these three figures may have, each is interested in probing the boundaries of belief, looking for the borders of rationality where our beliefs persist even in the face of evidence or arguments against them. Chapter 3 looks more closely at the version of Pyrrhonian skepticism found in Sextus Empiricus. Ribeiro argues that Sextus saw global suspension of belief as an ethical ideal conducive to tranquility and hence eudaimonia. Comparable to the Stoic moral sage, this ideal may not be fully realizable in actual life, but one can nevertheless make progress toward this ideal. Crucially, this progress is compatible with intractable beliefs about which suspension of judgment is difficult or fleeting: Even if one cannot globally suspend judgment about all matters at once, one can still become increasingly more tranquil as one develops the ability to suspend judgment more successfully over time. Chapter 4 transitions to Montaigne's Essays. Ribeiro devotes the bulk of the chapter to showing that Montaigne was explicitly influenced by ancient Pyrrhonian skepticism (via both Sextus and Cicero). The most important point, however, is that Montaigne exemplifies the Pyrrhonian project in his constant revisions to his Essays throughout his life, modeling the zetetic approach of perpetual investigation. Montaigne's chief contribution to this project is to redirect it away from the dogmatic disputes over unclear matters that we see among the ancient skeptics, and toward continual autobiographical self-reflection. Chapter 5 pauses the historical focus of the previous chapters, to return to the topic of human rationality. This chapter uses a Humean observation of the power of custom or habit compared to reason to argue that human rational self-control is surprisingly weak. Similar to the worry about epistemic akrasia discussed in chapter 1, here Ribeiro uses the plausibility of certain skeptical arguments to suggest that we may lack the ability to form beliefs even when we take the arguments supporting those beliefs to be persuasive. Chapters 6 and 7 return to a historical focus, this time concentrating on Hume. Drawing on the work of Karánn Durland, chapter 6 argues that there is an irresolvable tension across Hume's works: In some places Hume endorses naturalism, in others skepticism. Ribeiro takes this to be further evidence for...