Trent Horn and Casey Chalk build their critique of perspicuity on a confusion between the clarity of a text and the uniformity of its interpreters. Both men repeatedly argue that Protestant disagreement proves Scripture is obscure. This assumes that clarity is measured by the number of people who reach identical conclusions. That assumption is flawed because disagreement is a property of readers, not a property of the text. If disagreement were the measure of obscurity, then Aristotle would be obscure, Aquinas would be obscure, the Catechism would be obscure, and Vatican II would be obscure. Horn and Chalk collapse the distinction between what a text is and what readers do with it. Once that distinction is erased, no text can ever be called clear again, and this undermines the very Catholic documents they rely on.
A deeper problem is that both men assume clarity must be self‑authenticating. They treat perspicuity as if Protestants claim that Scripture must be equally clear to every reader regardless of education or maturity. This is an unrealistic standard because no communication works that way. A child and a scholar can read the same sentence and understand it at different depths without the sentence becoming obscure. Horn quotes the Westminster Confession, yet ignores its actual claim that Scripture is clear to the ordinary believer using ordinary means. Ordinary means include preaching, study, community, and the accumulated wisdom of the church. Horn and Chalk treat these means as concessions that undermine perspicuity, yet Catholics rely on the same means to understand magisterial documents. If the need for teachers undermines clarity, then Roman Catholicism collapses along with Protestantism.
Both men also assume that the Roman Catholic magisterium provides interpretive finality that Protestants lack. This is asserted rather than demonstrated. The magisterium issues authoritative statements, yet those statements themselves require interpretation and Catholics disagree about their meaning. The magisterium has not resolved debates over religious liberty, the interpretation of Humanae Vitae, the nature of predestination, or the meaning of “subsists in” in Lumen Gentium. Horn and Chalk speak as if the magisterium were a living oracle that can be consulted at will, yet in practice the magisterium speaks rarely and often in ways that require further clarification. They never explain why infallibility is necessary for understanding, nor why the existence of an infallible authority eliminates interpretive diversity. History shows that it does not.
Their philosophical assumptions are equally problematic. Both men assume that divine revelation must be structured in a way that eliminates ambiguity. This mirrors certain atheist arguments that claim if God exists, then He would make His existence unmistakably clear, and since He has not, He must not exist. Horn and Chalk apply the same logic to Scripture. If God intended Scripture to guide us, then He would make it unmistakably clear, and since Protestants disagree, Scripture must not be clear. This assumes that God’s purpose in revelation is to eliminate interpretive struggle. Scripture itself contradicts this assumption. Jesus speaks in parables that are intentionally difficult. Paul writes things that Peter says are “hard to understand.” The prophets deliver oracles that require discernment. Horn and Chalk presuppose a model of divine communication that Scripture does not endorse.
Finally, Horn and Chalk fail because they treat perspicuity as a theory of everything. They assume perspicuity must explain all doctrinal unity, all interpretive success, and all ecclesial cohesion. Perspicuity was never meant to bear that weight. It is a modest claim that Scripture is sufficiently clear in its central message that the church can proclaim the gospel without needing an infallible interpretive office. Horn and Chalk inflate perspicuity into a totalizing epistemology, then criticize it for failing to do what it never claimed to do. This is a category mistake, not a refutation.