Many letters dating from 1522, 1523 and 1524, written by Lutheran Humanists such as Eobanus Hessus, Euricius Cordus and Michael Nossenus, who, with disgust, were observing their behaviour, bore witness to the general deterioration of morals in the town, more particularly among the escaped monks and nuns.[1004] “I see,” Luther himself wrote to Erfurt, “that monks are leaving in great numbers for no other reason than for their belly’s sake and for the freedom of the flesh.”[1005] Meanwhile, discussions were held in the Erfurt circle of the semi-theologian Lang, on the absence of free-will in man and on “the evil that God does.” Lang applied to Luther for help. “I see that you are idlers,” was his reply, “though the devil provides you with abundance of occupation in what he plots amongst you. You must not argue concerning the evil that God does. It is not, as you fancy, the work of God, but a ceasing to work on God’s part. We desire what is evil when He ceases to work in us and leaves our nature free to fulfil its own wickedness. Where He works the result is ever good. Scripture speaks of such ceasing to work on God’s part as a ‘hardening.’ Thus evil cannot be wrought [by God], since it is nothing (‘_malum non potest fieri, cum sit nihil_’), but it arises because what is good is neglected, or prevented.” This was one of the ethical doctrines proclaimed by Luther and Melanchthon which lay at the back of the new theory of good works. Luther enlarged on it in startling fashion in his book “_De servo arbitrio_” (above, p. 223 ff.). Bartholomew Usingen, the learned and pious Augustinian, who had once been Luther’s professor and had enjoyed his especial esteem, witnessed with pain and sadness the changes in the town and in his own priory. The former University professor, now an aged man, fearlessly took his place in the yet remaining Catholic pulpits, particularly at St. Mary’s, assured of the support and respect of the staunch members of the fold who flocked in numbers to hear him. There he protested against the new doctrines and the growing licentiousness, though he too had to submit to unheard-of insults, abuse and even violent interruptions of his sermons when emissaries of the Lutherans succeeded in forcing their way in. He also laboured against religious innovations with his pen. “If we are taught,” says Usingen, “that faith alone can save us, that good works are of no avail for salvation and do not merit a reward for us in heaven, who will then take the trouble to perform them?--Why exhort men even to do what is right if we have no free-will? And who will be diligent in keeping the commandments of God if the people are taught that they cannot possibly be kept, and that Christ has already fulfilled them perfectly for us?”[1006]