The views of Luther were not original. Several theologians before him, even Cardinal Ximenes himself, had protested against the scandalous abuse of indulgences. Nor did Luther dream of rebelling against Mother Church. He did not deny the value of indulgences altogether, but declared that, in his opinion, the Pope could not thereby remit the guilt of sin nor abate the penalties of those who had already passed to their account. Further, he declared that the extravagant views he was combating were the invention of the schoolmen, not of the Church, which had never formally accepted them. He therefore demanded an expression of the mind of the Pope and Church thereon. Luther asked for discussion and for argument; he was met with assertion and denunciation. Tetzel in his answer disdained to discuss the question of indulgences at all, and he asserted the claim of the Pope to determine matters of opinion and to interpret Scripture. The Dominican Prierias declared that neither a Council presided over by the Pope, nor the Pope himself, could err when he gave an official decision, and branded all those as heretics who did not accept the doctrines of the Church and Popes, as the rule of faith. Cardinal Cajetan, who was sent as papal legate to the Diet of Augsburg in 1518, although he secretly agreed with Luther as to the abuse of indulgences, refused all disputation, and demanded a recantation and silence for the future. Luther’s subsequent promise to keep silence on his part, if it were adhered to on the other, could not possibly be kept, and the discussion soon broke out afresh.