In Goethe the instinct for self-mastery was as remarkable as his instinct for knowledge. As the result of his illness in Frankfort, his organs of sense were in a state of morbid susceptibility which "put him out of harmony with himself, with objects around him, and even with the elements." It throws a curious light on the nature of the man that amid all the preoccupations of his mind and heart in Strassburg he could deliberately turn his thoughts to the cure of his jarred nerves. Loud sounds disturbed him, and to deaden the sensitiveness of his ears he attended the evening tatoo; to cure himself of a tendency to giddiness he practised climbing the cathedral; partly to rid himself of a repugnance to repulsive sights he attended clinical lectures; and by a similar course of discipline he so completely delivered himself from "night fears" that he afterwards found it difficult to realise them even in imagination. In his old age Goethe said of himself: "I have that in me which, if I allowed it to go unchecked, would ruin both myself and those about me." Was it, as Goethe would have us believe, by sheer purposive will that he kept this dangerous element in him under check and saved himself at critical moments from disaster? When we regard his life as a whole, the actual facts hardly justify such a conclusion. Nature had given him two safeguards which, without any effort of will on his own part, assured him deliverance where the risk of wreckage was greatest--a consuming desire to _know_ which grew with every year of his life, and a versatility of temperament which necessitated ever-renewed sensations equally of the mind and heart. Of the working of these two elements in him we have already had illustration; they will receive further illustration as we proceed.