Luther was a North-German peasant with a first-class brain and possessed of great personal courage. He was a university man, a master of arts of the University of Erfurt; afterwards he joined a Dominican monastery. Then he became a college professor at the theological school of Wittenberg and began to explain the scriptures to the indifferent ploughboys of his Saxon home. He had a lot of spare time and this he used to study the original texts of the Old and New Testaments. Soon he began to see the great difference which existed between the words of Christ and those that were preached by the Popes and the Bishops. In the year 1511, he visited Rome on official business. Alexander VI, of the family of Borgia, who had enriched himself for the benefit of his son and daughter, was dead. But his successor, Julius II, a man of irreproachable personal character, was spending most of his time fighting and building and did not impress this serious minded German theologian with his piety. Luther returned to Wittenberg a much disappointed man. But worse was to follow. The gigantic church of St. Peter which Pope Julius had wished upon his innocent successors, although only half begun, was already in need of repair. Alexander VI had spent every penny of the Papal treasury. Leo X, who succeeded Julius in the year 1513, was on the verge of bankruptcy. He reverted to an old method of raising ready cash. He began to sell "indulgences." An indulgence was a piece of parchment which in return for a certain sum of money, promised a sinner a decrease of the time which he would have to spend in purgatory. It was a perfectly correct thing according to the creed of the late Middle Ages. Since the church had the power to forgive the sins of those who truly repented before they died, the church also had the right to shorten, through its intercession with the Saints, the time during which the soul must be purified in the shadowy realms of Purgatory. It was unfortunate that these Indulgences must be sold for money. But they offered an easy form of revenue and besides, those who were too poor to pay, received theirs for nothing.