A Treatise Concerning the Ban

A Treatise Concerning the Ban (Sermon von dem Bann) is a short German tract Luther published at Wittenberg in 1520, reworking a sermon he had preached there the previous year on excommunication. Listeners' notes of that sermon had circulated and been used against him by his opponents, and he set out his own version in print at the moment the question had become anything but academic: the papal bull Exsurge Domine, condemning his teaching and threatening him with excommunication, was issued in June 1520, and among the propositions it censured were his statements on the ban. The treatise is thus the reflection of a man writing about a weapon he fully expected to be turned on himself.

The argument rests on one distinction carried through to its consequences. There are two fellowships in the church, Luther says. The inner fellowship is the communion of faith, hope and love with Christ and with all believers; the outer fellowship is participation in the sacraments, in worship and in ordinary association with other Christians. The ban can touch only the second. No bishop, pope or official can expel anyone from the inner communion, because only sin and unbelief can do that, and God alone judges there. The ban is therefore not a sentence of damnation but a sign and a discipline, a mother's rod rather than an executioner's sword, given, in Paul's words, for building up and not for tearing down. From this follow two sets of instructions. The person justly banned should receive it with humility and let it drive him back to repentance. The person unjustly banned should neither despair nor rebel: he should bear the outer penalty quietly, forgo the sacraments without resentment, and rest in the inner fellowship that no one has taken from him, for an unjust ban injures the one who imposes it, not the one who suffers it. Luther reserves his sharpest words for the practice of his day, in which episcopal courts wielded excommunication over debts, fees and petty disputes, turning the church's gravest medicine into an instrument of extortion, and he insists that those who impose the ban carelessly stand under a heavier judgment than those they strike.

The treatise mattered first because it stripped the ban of its terror before the bull against Luther arrived, giving him and his readers a settled account of what excommunication could and could not do. It has continued to matter as one of the clearest early statements of a conviction that runs through the whole Reformation: that the church's outward institutions and inner spiritual reality are not the same thing, and that no human authority can close what God has opened.

Who should read this: those studying Luther's break with Rome or the theology of church discipline will find here a compact and surprisingly pastoral piece of the story, and anyone who has felt crushed by a religious authority's judgment may find its counsel unexpectedly steadying. It is not for readers looking for a general treatment of excommunication across traditions, nor for those who want Luther at his polemical peak; this is Luther measured, almost gentle, arguing a single point with care.