Luther's sentiments in the interval are expressed in a letter which he wrote on August 2 to a distant friend, the pastor Brismann at Eiga. 'Philip (Melancthon) and myself,' he says, 'after many refusals and much vain resistance, have been at length compelled to give our consent, because of the Landgrave's importunity; but I know not yet whether our going will come to anything. We have no hopes of any good result, but suspect artifice on all sides, that our enemies may be able to boast of having gained the victory.... I am pretty well in body, but inwardly weak, suffering like Peter from want of faith; but the prayers of my brethren support me.... That youth of Hesse is restless, and boiling over with projects.... Thus everywhere we are threatened with more danger from our own people than from our enemies. Satan rests not, in his bloodthirstiness, from the work of murder and bloodshed.' In the same letter Luther tells of the panic caused by a new pestilence--the Sweating Sickness--which had appeared in Germany and at Wittenberg itself. It was a plague, known already many years before, which used to attack its victims with fever, sweat, thirst, intense pain and exhaustion, and snatch them off with fearful rapidity. Luther knew well the danger of it when once it actually appeared. But he watched without terror the supposed symptoms of its appearance at Wittenberg, and remarked that the sickness there was mainly caused by fright. On the 27th he told another friend how the night before he had awoke bathed in sweat, and tormented with anxious thoughts, so much so, that had he given way to them he might very likely have fallen ill like so many others. He named also several of his acquaintances, whom he had driven out of bed, when they lay there fancying themselves ill, and who were now laughing at their own fancies. The Emperor, meanwhile, concluded a final treaty with the Pope on June 29, and on August 5 made peace with King Francis. By this treaty of Barcelona he pledged himself to provide a suitable antidote to the poisonous infection of the new opinions. By the peace of Cambray he renewed the promise, given in the treaty of Madrid, of a mutual cooperation of the two monarchs for the extirpation of heresy.