Abstract

In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:Aquinas on Efficient Causation and Causal Powers by Gloria FrostBrian DaviesGloria Frost. Aquinas on Efficient Causation and Causal Powers. Cambridge: Cambridge University Press, 2022. Pp. 288. Hardback, $99.99; paperback, $32.99.Philosophers have often assumed that good philosophy discusses what X, Y, or Z is essentially. And Thomas Aquinas is someone who favors this way of proceeding. At one point in his writings, he modestly recognizes that he is at a loss to explain what a house fly actually is. But he continually aims to tell us what such and such really is. And he does so when it comes to “cause” (causa). One might ask, “What is a cause?” or “What is causation?” Aquinas tries to answer these questions in theoretical ways that effectively add up to definitions of ‘cause’ and ‘causation.’Unfortunately, however, Aquinas never wrote a self-contained treatise on ‘cause’ and ‘causation.’ So, in order to fully understand what he says about these terms, one must pay attention to many texts scattered throughout his many writings, which may sound like bad news. The good news, however, is that Gloria Frost has now provided (for the first time, as far as I know) what amounts to an excellent and much-needed one-volume exposition of what Aquinas says about causation. More specifically, she has given us a fine scholarly work on the history of philosophy that focuses exegetically on what Aquinas calls “efficient” causation.Following Aristotle, Aquinas distinguishes between efficient, final, formal, and material causes (all of which are explanations of some kind). Frost has accurate things to say about Aquinas on material, formal, and final causes. But it is Aquinas on efficient causation that she homes in on in great detail—understandably, since Aquinas references this notion many times over and since what he means by ‘efficient causation’ seems in various ways to correspond to what “causation” is taken to be these days by both philosophers and nonphilosophers (few of whom are familiar with the phrases ‘material causation,’ ‘formal causation,’ and ‘final causation’). Frost rightly notes that Aquinas takes final causation to be bound up with efficient causation, and she explains the relation between them (chapter 4). Still, her focus is on Aquinas on efficient causation. As she writes, “I have combed through Aquinas’s corpus to find the most important passages about efficient causation and causal powers and using them as a basis, I reconstruct his views in a systematic way” (5).Chapter 1 begins this reconstruction by providing a general overview of Aquinas on efficient causation together with some historical background and context for understanding what he says on the topic. The chapter includes reference to views on causation differing from that of Aquinas and introductions to some of Aquinas’s sources concerning efficient causation. Chapters 2 through 6 expand on this overview in great detail with many quotations from Aquinas and a lot of cross-referencing within his writings. In these chapters, Frost expounds Aquinas on topics such as the distinction between per se and per accidens causation, temporality and causation, agent and patient, causation at a distance, actuality and potentiality, active power and passive power, and causation and necessitation. Chapter 7 deals with what Frost calls “non-paradigm” cases of efficient causation (191), which include absences (which Aquinas thinks can be efficient causes) and sine qua non efficient causation (which Aquinas does not think to be genuine efficient causation). Chapter 8 is devoted to instrumental causes, primary and secondary causation, and the causality of heavenly bodies. Each chapter begins with an introduction explaining what the core of the chapter is about. And each chapter ends with a summary of the findings of the chapter. This structure, which leads Frost to repeat herself a lot, might irritate some readers. I take [End Page 661] it to be didactically helpful. Nobody can complain that Frost has failed to make it clear what she takes Aquinas to be saying.Frost’s account of Aquinas on causation is exemplary. It is written with great clarity and avoids jargon. It draws heavily on texts of Aquinas and gives us an accurate account of what he thought about efficient causation (as well as...