Historically, the final stemming of the Protestant flood was due to the revival of energy in the Catholic Church and to the internal weakness and schism of the Protestants. Even within the Lutheran communion fierce conflicts broke out. Luther's lieutenants fought for his spiritual heritage as the generals of Alexander fought for his empire. The center of these storms was Melanchthon until death freed him from "the rage of the theologians." [Sidenote: April 19, 1560] Always half Catholic, half Erasmian at heart, by his endorsement of the Interim, and by his severe criticisms of his former friends Luther and John Frederic, he brought on himself the bitter enmity of those calling themselves "Gnesio-Lutherans," or "Genuine Lutherans." Melanchthon abolished congregational hymn-singing, and published his true views, hitherto dissembled, on predestination and the sacrament. He was attacked by Flacius the historian, and by many others. The dispute was taken up by still others and went to such lengths that for a minor heresy a pastor, Funck, was executed by his fellow-Lutherans in Prussia, in 1566. "Philippism" as it was called, at first grew, but finally collapsed when the Formula of Concord was drawn up in 1580 and signed by over 8000 clergy. This document is to the Lutheran Church what the decrees of Trent were to the Catholics. The "high" doctrine of the real presence was strongly stated, and all the sophistries advanced to support it canonized. The sacramental bread and wine were treated with such superstitious reverence that a Lutheran priest who accidentally spilled the latter was punished by having his fingers cut off. Melanchthon was against such "remnants of {134} papistry" which he rightly named "artolatry" or "bread-worship." But the civil wars within the Lutheran communion were less bitter than the hatred for the Calvinists. By 1550 their mutual detestation had reached such a point that Calvin called the Lutherans "ministers of Satan" and "professed enemies of God" trying to bring in "adulterine rites" and vitiate the pure worship. The quarrel broke out again at the Colloquy of Worms. Melanchthon and others condemned Zwingli, thus, in Calvin's opinion, "wiping off all their glory." Nevertheless Calvin himself had said, in 1539, that Zwingli's opinion was false and pernicious. So difficult is the path of orthodoxy to find! In 1557 the Zwinglian leader M. Schenck wrote to Thomas Blaurer that the error of the papists was rather to be borne than that of the Saxons. Nevertheless Calvinism continued to grow in Germany at the expense of Lutheranism. Especially after the Formula of Concord the "Philippists" went over in large numbers to the Calvinists. [Sidenote: Effect on the nation]