De Concordia praescientiae et praedestinationis et gratiae Dei cum libero arbitrio

Anselm of Canterbury's De Concordia represents his final and most systematic treatment of the perennial theological problem of reconciling divine foreknowledge, predestination, and grace with human free will. Writing at the height of his intellectual powers, Anselm addresses a cluster of interrelated questions that had vexed Christian thinkers since Augustine: how God's eternal knowledge of all events can coexist with genuine human choice, how divine predestination operates without destroying moral responsibility, and how grace enables salvation while preserving the freedom necessary for merit.

The work unfolds through a characteristically Anselmian method of necessary reasoning (rationes necessariae), seeking to demonstrate through logic alone that these apparent contradictions dissolve when properly understood. Anselm argues that divine foreknowledge poses no threat to free will because God's eternal perspective transcends temporal succession—God does not foresee future events but rather perceives all temporal moments simultaneously in an eternal present. This atemporalist solution, while drawing on Boethian insights, receives its most rigorous philosophical articulation in Anselm's careful analysis.

Regarding predestination, Anselm develops a nuanced position that distinguishes between God's antecedent and consequent will. While God desires all persons' salvation (antecedent will), divine justice requires that only those who freely choose righteousness receive eternal life (consequent will). Predestination thus operates through God's eternal knowledge of free choices rather than through coercive determination. This preserves both divine sovereignty and human agency within a unified theological framework.

The treatise's discussion of grace proves particularly innovative. Anselm argues that grace does not override freedom but rather restores and perfects it, enabling the will to achieve what it cannot accomplish through its own power alone. Grace operates not as external compulsion but as internal liberation, freeing the will from the bondage of sin to pursue its authentic good.

De Concordia's significance extends beyond its immediate theological context. The work provides crucial resources for later medieval debates about freedom and necessity, influencing figures from Peter Lombard to Thomas Aquinas. Its sophisticated treatment of modal logic, temporal indexing, and the metaphysics of divine action establishes conceptual distinctions that remain relevant to contemporary discussions in philosophical theology. By demonstrating how apparent contradictions in Christian doctrine yield to careful philosophical analysis, Anselm offers a model of faith seeking understanding that continues to shape theological method.