An Essay on Free Will

Peter van Inwagen's An Essay on Free Will represents a watershed in philosophical discussions of human agency and its implications for divine providence and moral responsibility. The work systematically dismantles compatibilist attempts to reconcile determinism with free will, establishing what has become known as the Consequence Argument. Van Inwagen demonstrates that if determinism is true, then our acts are consequences of the laws of nature and events in the remote past, neither of which are up to us, therefore our acts are not up to us.

The monograph's significance for philosophical theology emerges through its treatment of theological fatalism and divine foreknowledge. Van Inwagen argues that the same logical structure threatening free will under causal determinism applies equally to theological determinism. If God possesses infallible foreknowledge of all future events, then human actions appear as fixed as they would be under physical determinism. This creates profound difficulties for traditional theistic accounts of moral responsibility, divine judgment, and the coherence of petitionary prayer.

Van Inwagen advances an incompatibilist position maintaining that free will exists but is incompatible with determinism. He defends a libertarian conception of agency requiring genuine alternative possibilities for action. This stance preserves moral responsibility but at the cost of accepting causal indeterminism in nature. For theistic philosophy, this raises questions about divine sovereignty and providence. If human actions are not determined by prior states, how can God maintain providential control over history while respecting human freedom?

The work's methodological rigor employs modal logic and careful conceptual analysis, setting new standards for precision in free will debates. Van Inwagen engages critically with the compatibilist tradition from Hobbes through contemporary philosophers like Harry Frankfurt, while also addressing hard determinists who deny free will entirely. His arguments have forced theologians to reconsider traditional formulations of omniscience and providence.

The essay's lasting contribution lies in crystallizing the logical tensions between determinism and moral responsibility, forcing subsequent thinkers to choose between revising concepts of divine knowledge, accepting limitations on human freedom, or developing new metaphysical frameworks. Van Inwagen's analysis demonstrates that classical theism faces serious conceptual challenges in maintaining both comprehensive divine foreknowledge and robust human freedom, issues that remain central to philosophical theology.