The more vividly he persuaded himself of his mission, the blacker were the colours in which he painted the devil of Popery who refused to believe in it, and the more strangely did there surge up from the sombre depths of his soul and permeate his whole being a hatred the like of which no mortal man had ever known before. In such outbursts Luther thinks he is “raving and raging [’_debacchari_’] against Satan”; for instance, in a letter to Melanchthon, dated from the fortress of Coburg, “from the stronghold full of devils where Christ yet reigns in the midst of His foes.” Even when unable from bodily weakness to write against the devil, yet he could at least rage against him in thought and prayer; “the Pope’s enormities (‘_portenta_’) against God and against the common weal” supplied him with material in abundance.[1080] God had appointed him, so we read elsewhere, “to teach and to instruct,” as “an Apostle and Evangelist in the German lands” (were it his intention to boast); for he knows that he teaches “by the Grace of God, whose name Satan shall not destroy nor deprive me of to all eternity”; therefore I must unsparingly “expose my back parts to the devil ... so as to enrage him still more.” To the wrath of all the devils, bishops, and princes he will pay as little heed as to the rustle of a bat’s wing, nor will he spare the “traitors and murderers.”[1081] As early as 1520 he revealed to an intimate friend the morbidly exaggerated ideas which moved him: As an excuse for his dreadful vituperation he alleges his pseudo-mystic conception of the life and death struggle he was to engage in with the devil, and his sense of the “_impetus Spiritus_”; this he pleads in extenuation to his friend, who would appear to have reminded him of the dangers of pride. “All condemn my sarcasm,” he admits, but, now that the Spirit has moved him, he may set himself on a line with the “prophets” of the Old Law who “were so harsh in their invective,” nay, with Paul the Apostle, whose severe censures were ever present in his mind. In fact, God Himself, according to Luther, is to some extent present in these utterances by means of His power and action, and, “sure enough, intends in this way to unmask the inventions of man.”[1082]