Boundary-Defining Truths: Counterpossibles as Epistemic Discipline in Science and Revelation

Modern critiques sometimes dismiss Qur’anic and Prophetic conditional statements involving impossible antecedents as logically vacuous. This article demonstrates that such dismissals rest on a contestable account of conditionals and overlook the epistemic function of counterpossibles—conditionals with impossible antecedents. Drawing on contemporary debates in modal logic and philosophy of science, the study argues that counterpossibles function as epistemic boundary conditions within axiomatic systems, articulating structural necessity by exposing the consequences of violation. The paper does not claim novelty for this function within Islamic thought—where analogous reasoning is well established in kalām—but rather re-articulates it using the conceptual resources of contemporary modal logic. A comparative epistemic framework is developed with explicit limits to avoid conflating domains. The analysis engages both modern philosophical debates and classical Islamic distinctions regarding impossibility, and addresses objections concerning circularity, epistemic asymmetry, and rhetorical versus logical function. It concludes that while epistemic warrant differs across domains, the structural role of counterpossibles exhibits a form of cross-domain invariance.