The Adventure Of The German Student by Washington Irving

On a stormy night, in the tempestuous times of the French Revolution, a young German was returning to his lodgings, at a late hour, across the old part of Paris. The lightning gleamed, and the loud claps of thunder rattled through the lofty narrow streets--but I should first tell you something about this young German.
Gottfried Wolfgang was a young man of good family. He had studied for some time at Göttingen, but being of a visionary and enthusiastic character, he had wandered into those wild and speculative doctrines which have so often bewildered German students. His secluded life, his intense application, and the singular nature of his studies, had an effect on both mind and body. His health was impaired; his imagination diseased. He had been indulging in fanciful speculations on spiritual essences, until, like Swedenborg, he had an ideal world of his own around him. He took up a notion, I do not know from what cause, that there was an evil influence hanging over him; an evil genius or spirit seeking to ensnare him and ensure his perdition. Such an idea working on his melancholy temperament produced the most gloomy effects. He became haggard and desponding. His friends discovered the mental malady preying upon him, and determined that the best cure was a change of scene; he was sent, therefore, to finish his studies amidst the splendors and gayeties of Paris.