This article investigates how Plato thinks we secure necessary motivational conditions for inquiry. After presenting a typology of zetetic breakdowns in the dialogues, I identify norms of inquiry Plato believes all successful inquirers must satisfy. Satisfying these norms requires trust that philosophy will not harm but benefit inquirers overall. This trust cannot be secured by protreptic argument. Instead, it requires divine intervention—an extra-rational foundation for rational inquiry.

What role, if any, does dialectic play in Aristotle’s epistemology in the Topics? In this paper I argue that it does play a role, but a role that is independent of endoxa. In the first section, I sketch the case for thinking that dialectic plays a distinctively epistemological role—not just a methodological role, or a merely instrumental role in getting episteme. In the second section, I consider three ways it could play that role, on two of which endoxa play at (...) least a co-starring role. But in the third section, I argue that endoxa don’t play that co-starring role, by arguing for a deflationary account of what endoxa are. For that reason, the third view emerges as the most plausible; but the third view is, I’ll suggest, Platonic. (shrink)