After Luther had once ventured to attack openly this sale of indulgences, it was admitted even by their defenders and the violent enemies of the Reformer, that in those days 'greedy commissioners, monks and priests, had preached unblushingly about indulgences, and had laid more stress upon the money than upon confession, repentance, and sorrow.' Christian people were shocked and scandalised at the abuse. It was asked whether indeed God so loved the money, that for the sake of a few pence He would leave a soul in everlasting torments, or why the Pope did not out of love empty the whole of purgatory, since he was willing to free innumerable souls in return for such a trifle as a contribution to the building of a church. But not one of them found it then expedient to incur the abuse and slander of a Tetzel by a word spoken openly against the gross misconduct the fruits of which were so important to the Pope and the Archbishop. Tetzel now came to the borders of the Elector of Saxony's dominion, and to the neighbourhood of Wittenberg. The Elector would not allow him to enter his territory, on account of so much money being taken away, and accordingly he opened his trade at Jüterbok. Among those who confessed to Luther, there were some who appealed to letters of indulgence which they had purchased from him there. In a sermon preached as early as the summer of 1516, Luther had warned his congregation against trusting to indulgences, and he did not conceal his aversion to the system, whilst admitting his doubts and ignorance as to some important questions on the subject. He knew that these opinions and objections would grieve the heart of his sovereign; for Frederick, who with all his sincere piety, still shared the exaggerated veneration of the middle ages for relics, and had formed a rich collection of them in the Church of the Castle and Convent at Wittenberg, which he was always endeavouring to enrich, rejoiced at the Pope's lavish offer of indulgences to all who at an annual exhibition of these sacred treasures should pay their devotions at the nineteen altars of this church. A few years before he had caused a 'Book of Relics' to be printed, which enumerated upwards of five thousand different specimens, and showed how they represented half a million days of indulgence. Luther relates how he had incurred the Elector's displeasure by a sermon preached in his Castle Church against indulgences: he preached, however, again before the exhibition held in February 1517. The honour and interest, moreover, of his university had to be considered, for that church was attached to it, the professors were also dignitaries of the convent, and the university benefited by the revenues of the foundation. [Illustration: FIG. l2.--THE CASTLE CHURCH. (From the Wittenberg Book of Relics, 1509: the hill in the background is an addition by the artist.)]