The doctrine of indulgences had been opposed by men of learning and piety in the Roman Church, and there were many who had no faith in pretensions so contrary to both reason and revelation. No prelate dared lift his voice against this iniquitous traffic; but the minds of men were becoming disturbed and uneasy, and many eagerly inquired if God would not work through some instrumentality for the purification of His church. Luther, though still a papist of the straitest sort, was filled with horror at the blasphemous assumptions of the indulgence mongers. Many of his own congregation had purchased certificates of pardon, and they soon began to come to their pastor, confessing their various sins, and expecting absolution, not because they were penitent and wished to reform, but on the ground of the indulgence. Luther refused them absolution, and warned them that unless they should repent and reform their lives, they must perish in their sins. In great perplexity they repaired to Tetzel with the complaint that their confessor had refused his certificates; and some boldly demanded that their money be returned to them. The friar was filled with rage. He uttered the most terrible curses, caused fires to be lighted in the public squares, and declared that he “had received an order from the pope to burn all heretics who presumed to oppose his most holy indulgences.”(175) Luther now entered boldly upon his work as a champion of the truth. His voice was heard from the pulpit in earnest, solemn warning. He set before the people the offensive character of sin, and taught them that it is impossible for man, by his own works, to lessen its guilt or evade its punishment. Nothing but repentance toward God and faith in Christ can save the sinner. The grace of Christ cannot be purchased; it is a free gift. He counseled the people not to buy indulgences, but to look in faith to a crucified Redeemer. He related his own painful experience in vainly seeking by humiliation and penance to secure salvation, and assured his hearers that it was by looking away from himself and believing in Christ that he found peace and joy.