In proportion, meanwhile, as his knowledge of the people of Zurich and their circumstances increased, his sermons became more direct and pointed. If any one found fault with them, and it came to the ears of the preacher, he might be sure of an answer at the first opportunity. He did not hesitate to speak of them by name, and sometimes gave free play to his wit. Whatever was done, in convent-walls, bar-rooms, and even in the hall of the council, contrary to truth, reason and sound morals, was exposed without mercy from the pulpit. Just then, 1519, the throne of the German Empire became vacant by the death of Maximilian I. Intrigues in regard to the choice of a successor kept the diet assembled in Zurich, in constant employment. Envoys were repeatedly sent to Italy in the service of the Pope; France attempted once more to bring about a closer alliance, and towards the north, in spite of all the dissuasion of the allied powers, whole troops of deserters streamed to the banner of Duke Ulric of Wirtemberg, who, driven from his own capital, was engaged in war against the Swabian League. Amid these circumstances Zwingli took occasion to speak sometimes a word from the pulpit concerning politics. In this, the Gospel gave him less countenance, than the example of those Jewish prophets, who formerly made bold to bring the rule of kings under their examination, warning, or censure. But the times were no longer the same, and such a transgression of the bounds marked out by prudence, might well awaken concern in the bosoms of individual statesmen, who were not deserving of reproach.