In fragments of the lost Protrepticus, preserved in Iamblichus, Aristotle responds to Isocrates’ worries about the excessive demandingness of theoretical philosophy. Contrary to Isocrates, Aristotle holds that such philosophy is generally feasible for human beings. In defense of this claim, Aristotle offers the progress argument, which appeals to early Greek philosophers’ rapid success in attaining exact understanding. In this paper, I explore and evaluate this argument. After making clarificatory exegetical points, I examine the argument’s premises in light of pressing worries that the argument reasonably faces in its immediate intellectual context, the dispute between Isocrates and Aristotle. I also relate the argument to modern concerns about philosophical progress. I contend that the argument withstands these worries, and thereby constitutes a reasonable Aristotelian response to the Isocratean challenge.
In this article, I tackle an heretofore unnoticed difficulty with the application of Pyrrhonian scepticism to scientific definitions. Sceptics can suspend belief regarding a dogmatic proposition only by setting up opposing arguments or considerations for and against that proposition. Since Sextus provides arguments exclusively against particular geometrical definitions in Adversus MathematicosIII, commentators have argued that Sextus’ method is not scepticism, but negative dogmatism. However, commentators have overlooked the fact that arguments or considerations in favour of particular geometrical definitions were absent in ancient geometry, and hence unavailable to Sextus. While this might explain why they are also absent from Sextus’ text, I survey and evaluate various strategies to supply arguments in support of particular geometrical definitions.
I offer an examination of a core element in the reflectiveness of Heraclitus’ thought, namely, his rebuke of polymathy. In doing so, I provide a response to a recent claim that Heraclitus should not be considered to be a philosopher, by attending to his paradigmatically philosophical traits. Regarding Heraclitus’ attitude to that naïve form of ‘wisdom’, i.e., polymathy, I argue that he does not advise avoiding experience of many things, rather, he advises rejecting experience of things as merely many independent things in their manifoldness, and, instead, to understand their unity and thereby to unify our knowledge of them.
Pyrrhonian inquiry responds to the hope of intellectual tranquillity, and aims at the achievement and maintenance of said tranquillity. According to the Tranquillity Charge, philosophical inquiry aims at the truth; hence, insofar as Pyrrhonian inquiry aims at tranquillity, it does not qualify as philosophical inquiry. Furthermore, Pyrrhonian philanthropy rests on the Partisan Premise, i.e. the claim that all philosophers aim at the removal of psychological disturbance. I show that the origin-story of Pyrrhonism evades the Tranquillity Charge, and that the Partisan Premise is not as partisan as it seems. Unlike previous attempts, my reconstruction preserves all tranquillity-related features of Sextan Pyrrhonism.