Aquinas on Efficient Causation and Causal Powers by Gloria Frost (review)

Reviewed by: Aquinas on Efficient Causation and Causal Powers by Gloria Frost Julie Loveland Swanstrom FROST, Gloria. Aquinas on Efficient Causation and Causal Powers. New York: Cambridge University Press, 2022. xii + 239 pp. Cloth, 99. 99; paper, 32. 99; eBook, 32. 99 Reconstructing Aquinas's premodern approach to causation in which causation is an ontological rather than logical relationship is Frost's goal in Aquinas on Efficient Causation and Causal Powers. Uniting components of Aquinas's discussions of causation across his corpus, Frost focuses on the cause–effect relationship, the ontological elements involved in efficient causation, and complicated cases of efficient causation. End Page 715 Throughout, Frost provides background information from Aristotle, Avicenna, and other thinkers used by Aquinas while delving deeply into Aquinas's views. She addresses interpretive issues while remaining focused on Aquinas's own ideas. Frost identifies topics that prefigure historical and contemporary philosophical debates and interjects Aquinas's thought into those conversations. In part 1, Frost elucidates Aquinas's standard efficient causation and the corresponding causal powers. Chapter 1 reviews Aquinas's theories of efficient causation and briefly compares them with competing theories, identifying eight elements included in per se instances of efficient causation: the agent, the action, the active power, the natural inclination giving rise to the active power, the patient, the passive power of the patient, the motion caused by the agent, and the passion undergone by the patient. Chapter 2 further examines the paradigmatic per se efficient cause, the elemental qualities of hot, cold, wet, and dry adapted from Aristotle and used to explain change, and the ontological (rather than temporal) dependence of effects upon their causes. An agent acts by powers that stem from its nature. Frost addresses several medieval puzzles such as natural causes being considered generally unimpeded and no action being caused at a distance. Active and passive powers feature heavily in Aquinas's account. In chapter 3, Frost teases out the distinction between potentiality and actuality. The relationship of matter and form in material substances relates to this distinction in various, complex ways. "Actuality" applies to form or to action that completes active potentiality. Frost addresses the communicability of forms, conceptually connecting active powers to nature and goodness. Active powers' relations to elemental qualities, quantitative forms, and qualitative forms also appear in this chapter. Chapter 5 covers what agents operate on, passive powers in the patient. Frost addresses complexities regarding the relationship of qualities of matter to passive potentiality and adjudicates an interpretive difficulty about the relation of active potentiality and passive potentiality. She clarifies how passive potentialities do not correspond to only one active power and how different qualitative forms can give rise to the same passive potentiality. She also explains the uniqueness of creaturely passive potentiality to undergo divine action. Engaging in interpretive debate, she asserts that the passive potentiality for undergoing action and for existence differ in concept but are the same in reality. In chapter 4, Frost explains natural inclination: An agent's actions are determined to particular ends by its form. Natural inclination explains causal regularity. Both rational and natural agents possess natural inclination. God, as creator, is the source of natural inclination. Frost notes difficulties with Aquinas's views, including some later raised by Spinoza. Action and passion are discussed in chapter 6, wherein Frost connects action and passion to motion. Explaining how the patient's passive potentiality is no longer passive upon actualization, she argues that this End Page 716 change simply is motion: The mover causes, and the same motion immediately actualizes passive potentiality in the patient. Responding to challenges, Frost argues that "actuality" is an analogous term. Patients experience actuality as completing that in which thing it inheres while agents experience actuality as arising from them. Aquinas makes seemingly inconsistent statements about action and passion in terms of Aristotelian categories. Frost clarifies that if motion in the patient is passion and motion from the agent is action, then the categories explaining how motion belongs to the patient and the agent will be different. Frost turns to nonparadigmatic efficient causation in part 2. In chapter 7, she introduces additional causal scenarios. Preparing causes, advisory causes, and assisting causes highlight the interdependent. . .