Theism and Ultimate Explanation

This monograph presents a rigorous defense of theistic explanation as the most coherent account of ultimate reality. Piper develops a sophisticated version of the cosmological argument that addresses contemporary objections while advancing novel contributions to debates about explanation, necessity, and the limits of naturalistic accounts of existence.

The work's central thesis holds that theism provides the only genuinely ultimate explanation for the existence and nature of reality. Piper argues that all non-theistic explanatory frameworks ultimately fail to satisfy basic explanatory demands, either by positing brute facts that terminate explanation arbitrarily or by falling into various forms of circularity. Against naturalistic philosophers who accept brute facts as explanatory endpoints, he contends that such acceptance represents an unjustified abandonment of the principle of sufficient reason.

Piper's methodological approach combines classical philosophical analysis with engagement of recent developments in modal logic and explanation theory. He distinguishes between several types of explanation—causal, grounding, and constitutive—arguing that only a necessary being possessing the traditional divine attributes can serve as an adequate ultimate explanans. The work critically examines competing naturalistic proposals, including those that appeal to laws of nature, abstract objects, or quantum mechanical principles as fundamental explanatory resources.

A significant portion of the monograph addresses the objection that theistic explanation merely pushes the explanatory problem back one step. Piper responds by developing an account of divine necessity that he argues is both coherent and explanatorily superior to alternatives. Drawing on perfect being theology within the analytic tradition, he maintains that God's nature as maximally great entails existence necessarily, thereby terminating the explanatory regress in a principled rather than arbitrary manner.

The work engages extensively with contemporary critics of cosmological reasoning, particularly Graham Oppy and J.L. Mackie, while also incorporating insights from recent defenders of theistic argument such as Alexander Pruss and Joshua Rasmussen. Piper's contribution lies not merely in defending familiar cosmological reasoning but in developing a comprehensive theory of ultimate explanation that integrates metaphysical, epistemological, and semantic considerations.

The monograph represents a significant contribution to natural theology within the analytic tradition, offering both a sustained critique of naturalistic explanatory frameworks and a positive case for theistic metaphysics. Its careful attention to the logical structure of explanation and its engagement with cutting-edge philosophical literature make it an important text for understanding contemporary debates about God's existence and explanatory role.