§ 167.4. =Unionist Efforts.=--The distinguished theologian Chr. Matt. Pfaff, chancellor of the University of Tübingen, who, without being numbered among the pietists, recognised in pietism a wholesome reaction against the barren worship of the letter which had characterized orthodoxy, regarded a union between the Lutheran and Reformed churches on their common beliefs, which in importance far exceeded the points of difference, as both practicable and desirable; and in A.D. 1720 expressed this opinion in his “_Alloquium Irenicum ad Protestantes_,” in which he answered the challenge of the “_Corpus Evangelicorum_” at Regensburg (§ 153, 1). His proposal, however, found little favour among Lutheran theologians. Not only Cyprian of Gotha, but even such conciliatory theologians as Weismann of Tübingen and Mosheim of Helmstädt [Helmstadt], opposed it. But forty years later a Lutheran theologian, Heumann of Göttingen, demonstrated that “the Reformed doctrine of the supper is true,” and proposed, in order to end the schism, that Lutherans should drop their doctrine of the supper and the Reformed their doctrine of predestination. This pamphlet, edited after the author’s death by Sack of Berlin, in A.D. 1764, produced a great sensation, and called forth a multitude of replies on the Lutheran side, the best of which were those of Walch of Jena and Ernesti of Leipzig. Even within the Lutheran church, however, it found considerable favour.