On Simony

Jan Hus wrote this Latin treatise on simony in 1413, during the height of his confrontation with church authorities over ecclesiastical corruption. The work emerged from his pastoral experience in Prague, where he witnessed firsthand the buying and selling of church offices, benefices, and spiritual services that had become endemic throughout the medieval Catholic Church. Writing in the shadow of the Western Schism, when competing papal claimants had intensified corruption as each faction sought to secure loyalty through the distribution of ecclesiastical positions, Hus sought to provide both theological analysis and practical guidance for reform.

The treatise systematically examines the nature and varieties of simony, drawing extensively on canon law, patristic sources, and scholastic theology to demonstrate that the purchase of spiritual offices violates the fundamental nature of divine grace. Hus argues that spiritual gifts cannot be commodified without destroying their essential character, and he traces the theological implications of treating grace as merchandise. He distinguishes between different forms of simony—including the exchange of money, services, and influence for ecclesiastical position—and demonstrates how each corrupts both the individual soul and the institutional church. The work connects simony to broader questions of church authority, arguing that the practice undermines the spiritual legitimacy of those who engage in it and therefore calls into question their right to exercise ecclesiastical power.

De Simonia became one of the key texts in the pre-Reformation critique of institutional corruption, influencing later reformers who would cite Hus's arguments about the relationship between spiritual authority and moral integrity. The treatise demonstrates the theological sophistication of the Bohemian reform movement and helps explain why Hus's challenge to church corruption was perceived as so threatening by the ecclesiastical establishment. Who should read this: students of medieval ecclesiology and pre-Reformation reform movements will find essential arguments about church authority and corruption, while those interested in the theology of grace and ecclesiastical office will encounter rigorous analysis of how institutional practices affect spiritual realities.