Leipzig Debate

Background

After Martin Luther issued the Ninety-five Theses in 1517, Johann Eck, a professor at the University of Ingolstadt, criticized them. Luther's Wittenberg colleague Andreas Karlstadt then came to Luther's defense. In 1518 Karlstadt challenged Eck to a public disputation on human free will and grace. (A disputation was a form of academic debate in medieval universities in which an attacking side and a defending side publicly contested theses announced in advance.) The theses Eck published in December 1518, however, were aimed more at Luther than at Karlstadt, and Luther therefore decided to enter the debate himself. In preparation, Luther advanced a thesis asserting that papal primacy (supreme authority over the whole Church) rests not on divine law but on human law.

The theological faculty of the University of Leipzig and the Bishop of Merseburg opposed holding the debate. With the support of Duke George of Saxony, however, it went forward, and the duke's castle, the Pleissenburg, was chosen as the venue.

Course of the Debate

• June 27, 1519: The debate opened with an oration by Petrus Mosellanus, a Greek scholar at the University of Leipzig. Karlstadt and Eck first contended over the role of free will in justification. Philip Melanchthon was also present with the Wittenberg party.
• July: Luther and Eck then debated. They also addressed purgatory, penance, and indulgences, but the central issue was papal primacy. Luther argued that papal primacy could not be supported from Scripture. In a disputation the attacking side could steer the course of the debate, and Eck used this advantage to link Luther's views with those of Jan Hus, the Bohemian reformer (Bohemia corresponds to present-day western Czech Republic). Hus had been condemned as a heretic by the Council of Constance (1414–1418) and burned at the stake. Luther responded that some of Hus's teachings condemned by the council were Christian and evangelical. He further stated that councils (assemblies representing the whole Church) could err and in fact had erred. This statement implied that the authority not only of the pope but also of councils was not absolute.
• The debate ended around July 15; some sources give July 16.

Outcome and Influence

It was agreed that the verdict would be left to the University of Erfurt and the University of Paris, but no official judgment was ever issued. In Leipzig, Eck was hailed as the victor, and Luther is reported to have acknowledged that Eck had won. As a result of the debate, Duke George turned against Luther.

Nevertheless, as the record of the debate was printed and Melanchthon publicized it in his writings, Luther's views spread more widely, and public opinion generally moved in Luther's favor. Luther thereafter began to regard Hus as his forerunner. Prompted by the debate, Eck urged that the case against Luther, which had been under way in Rome since 1518, be reopened. In 1520 he traveled to Rome and took part in drafting Pope Leo X's bull Exsurge Domine (June 15, 1520), which threatened Luther with excommunication unless he submitted. Luther was excommunicated in 1521, and in the same year, following the Diet of Worms, he was also placed under the imperial ban.

Assessment

The debate is considered significant because what began as a narrow academic dispute over indulgences became a public controversy over the question of final authority in the Church.

• Protestant view: The debate is seen as the turning point at which Luther set out on the path of placing Scripture above pope and council as the final authority. Protestants hold that the principle later formulated as "Scripture alone" (the Five Solas) clearly emerged at this time.
• Catholic view: The debate is seen as one in which Eck exposed how Luther's views departed from church tradition and conciliar decisions. At the same time, it is regarded as a step on the road toward the division of the Church.

On the 500th anniversary of the debate in 2019, both Protestant and Catholic media in Germany treated it as a milestone in the division of the Church.