was of subsequent importance to the Reformation. Melanchthon presented a new doctrine of Christianity under the form of a discussion of the "leading thoughts" of the Epistle to the Romans. Loci communes contributed to the gradual rise of the Lutheran scholastic tradition, and the later theologians Martin Chemnitz, Mathias Haffenreffer, and Leonhard Hutter expanded upon it. Melanchthon continued to lecture on the classics. On a journey in 1524 to his native town, he encountered the papal legate, Cardinal Lorenzo Campeggio, who tried to draw him from Luther's cause. In his Unterricht der Visitatorn an die Pfarherrn im Kurfürstentum zu Sachssen (1528) Melanchthon presented the evangelical doctrine of salvation as well as regulations for churches and schools. In 1529, Melanchthon accompanied the elector to the Diet of Speyer. His hopes of persuading the Holy Roman Empire to recognize the Reformation were not fulfilled. A friendly attitude towards the Swiss at the Diet was something he later changed, calling Huldrych Zwingli's doctrine of the Lord's Supper "an impious dogma". Augsburg Confession The composition now known as the Augsburg Confession was laid before the Diet of Augsburg in 1530, and would come to be considered perhaps the most significant document of the Protestant Reformation. While the confession was based on Luther's Marburg and Schwabach articles, it was mainly the work of Melanchthon; although it was commonly thought of as a unified statement of doctrine by the two reformers, Luther did not conceal his dissatisfaction with its irenic tone. Indeed, some would criticize Melanchthon's conduct at the Diet as unbecoming of the principle he promoted, implying that faith in the truth of his cause should logically have inspired Melanchthon to a firmer and more dignified posture. Others point out that he had not sought the part of a political leader, suggesting that he seemed to lack the requisite energy and decision for such a role and may simply have been a lackluster judge of human nature. Melanchthon then settled into the comparative quiet of his academic and literary labours. His most important theological work of this period was the Commentarii in Epistolam Pauli ad Romanos (Wittenberg, 1532), noteworthy for introducing the idea that "to be justified" means "to be accounted just", whereas the Apology had placed side by side the meanings of "to be made just" and "to be accounted just". Melanchthon's increasing fame gave occasion for prestigious invitations to Tübingen (September 1534), France,