front cover of Nature and Nature's God
Nature and Nature's God
A Philosophical and Scientific Defense of Aquinas' Unmoved Mover Argument
Daniel Shields
Catholic University of America Press, 2023
Aquinas’ first proof for God’s existence is usually interpreted as a metaphysical argument immune to any objections coming from empirical science. Connections to Aquinas’ own historical understanding of physics and cosmology are ignored or downplayed. Nature and Nature's God proposes a natural philosophical interpretation of Aquinas’ argument more sensitive to the broader context of Aquinas’ work and yielding a more historically accurate account of the argument. Paradoxically, the book also shows that, on such an interpretation, Aquinas’ argument is not only consistent with modern science, but actually confirmed by the history of science, from classical mechanics through 19th century thermodynamics to contemporary cosmology. The first part of the book considers Aquinas’ argument in its historical context, exploring the key principles that everything in motion is moved by something else and that an infinite regress of causes is impossible. The structure of the First Way is analyzed and the argument is connected both with Aquinas’ Third Way—a new interpretation of which is also proposed—and Aquinas’ second proof from motion in the Summa contra Gentiles. To complete the account of what natural philosophy—prior to metaphysics—can demonstrate about God, a chapter on Aquinas’ teleological argument (the Fifth Way) is also included. The second part of the book tracks the history of modern science from Copernicus to today, showing how Aquinas’ argument fared at each major turn. The first chapter shows how Newton’s understanding of inertia and conservation of momentum supports the idea that motion cannot continue forever without God’s causality, and integrates a modern understanding of inertia and gravity with the principles of Thomistic natural philosophy. The second chapter considers the first and second laws of thermodynamics, showing how they too support Aquinas’ contention that motion cannot continue forever without God’s causality. This chapter also discusses statistical mechanics and contemporary cosmology, demonstrating that science continues to support Aquinas’ unmoved mover argument. The final chapter turns to modern biology as well as cosmological fine-tuning to show that modern science also continues to support Aquinas’ teleological argument. The result is not only a satisfying defense of Aquinas’ natural philosophical proofs for God’s existence, but a primer on the broader project of integrating Thomistic natural philosophy with modern science.
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front cover of Neither Nature nor Grace
Neither Nature nor Grace
Aquinas, Barth, and Garrigou-Lagrance on the Epistemic Use of God's Effects
T. Adam Van Wart
Catholic University of America Press, 2021
Neither Nature nor Grace operates at the intersection of systematic and philosophical theology, exploring in particular how St. Thomas Aquinas variously uses the latter in service to the clarification and faithful advancement of the former. More specifically, Neither Nature nor Grace explores the overlooked logical difficulties that have followed the late modern debates in ecumenical Christian theology as to whether knowledge of God is available solely through God’s gracious self-revelation (e.g., Jesus Christ and Holy Scripture), or through revelation and the deliverances of natural reason. Van Wart takes the prominent French Dominican Reginald Garrigou-Lagrange as paradigmatic for the case that knowledge of God can be had by both revelation and natural reason. Representing the opposing position, that God can only be known through divine revelation, Van Wart highlights the work of influential Protestant theologian Karl Barth. By placing these two imposing 20th century theologians in conversation, and by providing a careful theo-philosophical analysis of the logical mechanics of each thinker’s respective arguments, Van Wart shows how both inadvertently overreach their self-professed epistemological bounds and just so run into significant problems maintaining the coherence of their relative theological positions. That is, against their expressed intentions to the contrary, both thinkers unwittingly evacuate the divine essence of the mystery Christian tradition has always previously claimed it to have, effectively reducing the being of God to mere creaturely being writ large. As a contrasting corrective to this problem, Van Wart proffers a constructive grammatical reading of Aquinas’s measured account of the crucial but often overlooked logical differences between what can be said of the divine, on the one hand, versus what can be known of God, on the other. While many recent works have attempted to solve the ongoing arguments which Garrigou-Lagrange and Barth epitomize regarding the epistemic use of God’s effects, Van Wart’s contribution constructively pushes the conversation to a different level in showing how Aquinas’s grammar of God provides a salutary means of dissolving and moving beyond these contentious debates altogether.
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