However, Nathaniel was quite right, when he wrote to his friend Lothaire that the form of the repulsive barometer-seller, Coppola, had had a most hostile effect on his life. All felt, even in the first days, that Nathaniel had undergone a thorough change in his whole temperament. He sank into a gloomy reverie, and conducted himself in a strange manner, that had never been known in him before. Every thing, his whole life, had become to him a dream and a foreboding, and he was always saying that every man, although he might think himself free, only served for the cruel sport of dark powers. These he said it was vain to resist, and man must patiently resign himself to his fate. He went even so far as to say, that it is foolish to think that we do any thing in art and science according to our own self-acting will, for the inspiration which alone enables us to produce any thing, does not proceed from within ourselves, but is the effect of a higher principle without. To the clear-headed Clara this mysticism was in the highest degree repugnant, but contradiction appeared to be useless. Only when Nathaniel proved that Coppelius was the evil principle, which had seized him at the moment when he was listening behind the curtain, and that this repugnant principle would in some horrible manner disturb the happiness of their life, Clara grew very serious, and said: “Yes, Nathaniel, you are right. Coppelius is an evil, hostile principle; he can produce terrible effects, like a diabolical power that has come invisibly into life; but only then, when you will not banish him from your mind and thoughts. So long as you believe in him he really exists, and exerts his influence; only your belief is his power.” Nathaniel, quite indignant that Clara established the demon’s existence only in his own mind, would then come out with all the mystical doctrine of devils and fearful powers. But Clara would break off peevishly, by introducing some indifferent matter, to the no small annoyance of Nathaniel. He thought that such deep secrets were closed to cold, unsusceptible minds, without being clearly aware that he reckoned Clara among these subordinate natures, and therefore he constantly endeavoured to initiate her into the mysteries. In the morning, when Clara was getting breakfast ready, he stood by her, and read out of all sorts of mystical books, till she cried: “But, dear Nathaniel, suppose I blame you as the evil principle, that has a hostile effect upon my coffee? For if to please you, I leave every thing standing still, and look in your eyes, while you read, my coffee will run into the fire, and none of you will get any breakfast.”