After reading Ancient Philosophy (2004) by Anthony Kenny, and not liking it (at all), one might wonder: Why, then, do you read Medieval Philosophy (2005), written by the same author? Well, the simple answer is: I had already bought both books.
The more complicated answer: years ago I started reading the original works by philosophers and scientists, because I wanted to gain a proper understanding of the philosophical and scientific developments and their interaction with culture, politics, etc. In short: I wanted to understand intellectual history. The problem with such an approach is that one can read all of the original works, but this lacks structure. So once in a whole, I'd like to systematize all my knowledge, putting all the pieces together, and to be able to do this I read modern books that offer an overview and integration.
So, anyway, that's why I chose to read Medieval Philosophy.
From the outset, I have to admit that the book is slightly better than the first Volume (Ancient Philosophy) in Kenny's series. Medieval Philosophy has the same structure as the first book: 1/3 of the book chronological developments (roughly 400-1400), 2/3 thematic discussions. This division is still flawed: the developmental part is easy to follow, but once Kenny enters thematic discussions, it pretty soon becomes hard to follow.
One problem is the artificially chopped-up subjects. So the coherent philosophical systems and ideas of Augustine, Averroes, Aquinas & co. are cut up into pieces and these fragments are then placed - chronologically - into each thematic chapter. This is problematic primarily because these philosophers didn't wrote their works for it to be chopped up. So, when Kenny divides the second part of his book into themes like: language & logic, knowledge, physics, metaphysics, soul & mind, ethics, and God, this means, in effect, that to understand, for example, Aquinas' view on some subject has to be referenced with Aquinas' views on other subject. For instance, when dealing with metaphysics, Kenny asserts that, since Augustine's metaphysics is intimately tied to his theology, it is better to explain Augustine's views in the chapter on God. The truth is, for these writers, there simply was no such distinction as Kenny makes. Augustine wrote a book, City of God, which deals with all of the themes that Kenny distinguishes.
Another problem, connected with the first one, is the multitude of references to other chapters. This is a consequence of Kenny's thematic division. This was already problematic in the first Volume, but now Kenny references not just to parts in the same book, but also to parts in the earlier book. Which makes following the main arguments very hard and one is constantly hindered from continuing, which reduces the reading experience (for me, at least) to a minimum.
A third problem, also present in the first Volume, is Kenny's approach in explaining the philosophies involved. He has a peculiar style of explanation, and one gets the impression that Kenny wants to be the popular teacher - trying to offer accessible introductions to less accessible information. This is laudable, especially since Medieval philosophy is pretty abstract and esoteric, but there's something with Kenny's way of expressing himself that completely blocks me from gaining any insights from his texts. I simply can't follow his explanations and this becomes irritating after the two first thematic chapters.
A big plus in this book, as compared to the first Volume, is the interesting material Kenny can work with. Ancient philosophy is pretty chewed up (I mean, who didn't get this subject in school), while Medieval philosophy is, by comparison, much less known. Which makes it a more interesting historical period in philosophy and science to write a book about. Unfortunately, this advantage is only partially exploited by Kenny. In the chronological part of the book, Kenny is able to offer readers new insights and to connect Ancient philosophy (pre-Augustine) to Modern philosophy (post-Descartes) in an informative way.
Yet, in the thematic part of the book (which, again, is about 2/3 of the entire book), the material becomes pretty dull at times. To be honest, this is not Kenny's fault. St. Augustine was the last original thinker up to René Descartes - anything in between is - generalizing, I know, I know - translation of old works, disputing about these works and trying to solve puzzles that were brought up by these old works. Frankly, Medieval philosophy was one big attempt to philosophize theology - in the sense that Christian theology was given as ultimate truth, and that philosophy was used as a tool to support theological doctrines, to understand nature in order to know God's works better, and to help resolve theological problems. The Middle Ages saw philosopers and theologians - the distinction is, frankly, a modern one - attempting to make sense of old works in light of Scripture and to fit in these old works where friction between both fields arose.
For example, the universally hailed St. Thomas Aquinas did nothing more (nor less) than working out how Aristotle's metaphysics and philosophy could be adjusted so that it would fit neatly within a Scriptural framework. And, in general, the whole period of the Middle Ages, saw philosophers clinging obsessively to logic as a way to truth. Logic, epistemology, ethics, psychology and metaphysics were all branches of the same tree, which was theology. God had given us a revelation - through the prophets, and, ultimately, Jesus Christ - and this was the primary and only truth. Anything else (like philosophy) had to acknowledge this scriptural truth, or at least not contradict it.
There's a charicature that the Medieval period saw theologians arguing how many Angels could dance on the head of a pin. This might be a bit unfair, but the gist of the joke is absolutely true. The Middle Ages were a period in which philosophers and theologians (again, the distinction only makes sense in retrospect) would argue both for and against propositions, review the arguments on both sides, and then pick the argument that would fit best within the existing Christian edifice.
This is, frankly, not the road to knowledge. For one, knowledge requires that preconceived notions go out the window: a priori truths have no place in a quest for knowledge. So, theology is, in that sense (and to me in any possible sense), incommensurable wih both philosophy and science. Second, Aristotle's axiomatic-deductive system of knowledge is severly handicapped and, ultimately, will hinder us in our quest for knowledge. To know the world, experience of the world is a necessary (although not sufficient) condition. Logic, in that sense, is only a tool for us to build our theories and hypotheses. Empirical science is needed to discover new truths - and this simply didn't have a place in the framework of Medieval philosophy.
It was only when René Descartes overthrew both Christian theology and the Aristotelean axiomatic-deductive system, and when Francis Bacon emphasized the need for empirical science and inductive truths, that the minds of intellectuals were opened up to alternative approaches to the quest for knowledge.
We, moderns, are steeped solely in inductive reasoning and empirical science, and it is extremely hard for us to enter the minds of people who think in terms of Aristotelean concepts and theological a priori's. It feels unnatural, and it feels awkward, and a lot of times it simply doesn't make any sense. I think this is why I couldn't enjoy Kenny's second Volume in his series, like the first Volume - it simply doesn't make sense to me. I understand what he's saying and what the original works were about, but I simply don't get it. It looks to me like Medieval philosophy is - for modern day readers, at least - nothing but a way to enjoy leisure time. Getting familiar with old ways of thinking, without drawing any implications from them - or rather: without being able to draw any implications from them.
Nevertheless, even though both the content and the structure of the book don't speak to me, I can see Kenny is a knowledgable author and he does his best to present the material as best as he can. This book is also slightly more interesting than the first book, so that's a plus.