There were other abuses in the Church of Rome which Luther now openly deplored. Hot discussion followed this bold step. Tetzel retired to Frankfort, {55} but from there he wrote to contradict the new teaching of the Augustine monk. He burnt Luther's theses publicly, and then heard that his own had been consigned to the flames in the market-place of Wittenberg, where a host of sympathisers had watched the bonfire with satisfaction. Luther did not stand alone in his struggle to free the Church from vice and superstition. He lived in an age when men had learning enough to despise the trickery of worldly monks. The spirit of inquiry had lived through the Revival of Letters and Erasmus, the famous scholar, had discovered many errors in the Roman Church. Erasmus joined Luther in an attempt to show men that the Holy Scriptures alone would offer guidance in spiritual matters. He knew that a reform of the Western Church was urgently needed, and was willing to use his subtle brains to confute the arguments of ignorant opponents. But soon he found that Luther's temper was too ardent, that there was no middle course for this impetuous spirit. He dreaded for himself the loss of wealth and honour, and refused to make war on those in high stations, whose patronage had helped him to the rewards of knowledge. Alarmed by the spread of Luther's books and doctrines, the cardinals entreated the Pope to summon him to Rome. Printing had been invented, and poor as well as rich could easily be roused to inquire into the truth of the doctrines taught by Rome. Leo X had been disposed to ignore the sermons of the obscure German monk, for he had many schemes to further his own ambition. He yielded, at last, and sent the necessary summons. Luther was loth to go to Rome, where he was sure of condemnation. The Elector Frederick of Saxony came forward as his champion, not from religious {56} motives, but because he was pleased to see some prospect of the exactions of the court of Rome being diminished. Cajetan, the Papal Legate, came to preside over a Diet, summoned specially to Augsburg. He urged the monk to retract his dangerous doctrine that the authority of the Bible was above that of the Pope of Rome. "Retract, my son, retract," he urged; "it is hard for thee to kick against the pricks." But the conference ended where it had begun--Luther fled back to Wittenberg.