: In Contra Academicos 3.11.24, Augustine responds to skepticism about the existence of the external world by arguing that what appears to be the world — as he terms things, the "quasi-earth" and "quasi-sky" — cannot be doubted. While some (e.g., M. Burnyeat and G. Matthews) interpret this passage as a subjectivist response to global skepticism, it is here argued that Augustine's debt to Epicurean epistemology and theology, especially as presented in Cicero's De Natura Deorum 1.25.69 - 1.26.74, provides the (...) basis for a much more plausible, realist interpretation of Augustine's argument. (shrink)

This paper investigates the nature of truth and certainty according to the French Franciscan theologian Peter Auriol. In the first section, I attempt to harmonize a few different sections of Auriol’s Scriptum on book i of the Sentences: the accounts of truth as conformity in question 2 of the Prologue and question 10 of distinction 2, and the account of truth as quiddity in question 3 of distinction 19. In the second section, I explore the notion of certainty in question (...) 1 of the Prologue. Here, Auriol’s taxonomy of propositions is explained, and the difference between scientific certainty and the certitude of faith is outlined. God works in the background in the context of both truth and certainty, and the fact that our cognitive processes are generally trustworthy makes Auriol’s epistemological position into a species of reliabilism. (shrink)

The epistemological views of medieval philosophers Augustine, Thomas Aquinas, and William of Ockham are considered in turn. First, Augustine’s refutation of skepticism from the Contra Academicos and his positive account of knowing Divine Ideas from the De Magistro are outlined, after which there is a brief discussion of his Vital Attention theory of sensation. Second, Aquinas’s account of self-evident propositions, sensation, concept formation, knowledge of singulars, and self-knowledge from the Summa Theologiae is covered. Third, Ockham’s picture of scientific knowledge from (...) his Commentary on Aristotle’s Physics is followed by an examination of his theories concerning evidentness, intuitive cognition, and abstractive cognition from his Ordinatio. (shrink)

This book begins with standard ontological topics--such as the nature of existence--and of metaphysics generally, such as the status of universals, form, and accidents. What is the proper subject matter of metaphysical speculation? Are essence and existence really distinct in bodies? Does the body lose its unifying form at death? Can an accident of a substance exist in separation from that substance? Are universals real, and, if so, are they anything more than general concepts? Among the figures it examines are (...) Thomas Aquinas, John Duns Scotus, William of Ockham, Walter Chatton, John Buridan, Dietrich of Freiburg, Robert Holcot, Walter Burley, and the 11th-century Islamic philosopher Ibn-Sina. There is also an emphasis on metaphysics broadly conceived. Thus, additional discussions of connected topics in medieval logic, epistemology, and language provide a fuller account of the range of ideas included in the later medieval worldview. (shrink)

In this paper, I examine Augustine’s response to two Socratic statements: his exhortation for us to know ourselves, and his claim that he knows only that he knows nothing. Augustine addresses these statements in many works, but I focus in particular on his discussion of error in Contra Academicos, and his account of self-knowing (and not-knowing) in De Trinitate (DT). -/- For Augustine, error can occur in at least four distinct ways, and one of his main purposes in Contra Academicos (...) is to show that having an overly narrow view of error, focused on only one of those ways—namely, approving a falsehood as a truth—too easily leads to skepticism. He argues instead that erring can be a sin both of commission and of omission, and that failing to assent when one should assent is just as problematic as assenting when one should not. In both Contra Academicos and De Trinitate, Augustine extends his position by exploring the ways in which one can achieve epistemic certainty. But in doing this, he also offers scattered remarks about how one recognizes that one has not yet achieved certain knowledge, and thus about how one can know that one does not know. It is here that Augustine’s views are the most muddled, since he simultaneously claims that we (as humans in this life) are ignorant in many fundamental ways, that knowledge of something requires knowledge of that thing as a whole, and that nevertheless we can know ourselves, which obviously involves knowing that we do not know. It is to this puzzling group of claims that the remainder of the paper is addressed. (shrink)