Luther believed that he had not only heard the devil tormenting him by day, and more particularly by night, with divers dreadful noises, but that he had seen him in his room under the form of a huge black dog, and had chased him away by prayer. His statements, to which we shall return in detail in another connection (vol. vi., xxxvi. 3; cp. vol. v., xxxi. 4), are such as presuppose, at the very least, the strangest illusions. Some have even opined that he suffered from real hallucinations of hearing and sight, though they have adduced no definite proof of such. The disputes with the devil, of which he speaks, are certainly nothing more than a rhetorical version of his own self-communings. If Luther brought with him to the Wartburg a large stock of popular superstition, he increased it yet more within those dreary walls, thanks to the sensitiveness of his lively imagination, until he himself became the plaything of his fancy. “Because he was so lonely,” writes his friend the physician Ratzeberger, on the strength of Luther’s personal communication, “he was beset with ghosts and noisy spirits which gave him much concern.” And after quoting the tale of the dog he goes on: “Such-like and many other ghosts came to him at that time, all of which he drove away by prayer, and which he would not talk about, for he said he would never tell anyone by how many different kinds of ghosts he had been molested.”[198] The temptations of the flesh which he then experienced Luther also attributed, in the main, to the devil. They fell upon him with greater force than ever before. Their strength displeased him, according to his letters, and he sought to resist them, though it is plain from his words that he realised the utter futility of his desire to rid himself of them. In this state of darkness he directed his thoughts more vigorously than heretofore to the question of monastic vows and their binding power. He seems to be clanking the chains by which he had by his own vow freely pledged himself to the Almighty.