Godolphin, Volume V by Edward Bulwer-lytton

It was perfectly true that there had appeared in London a person of the female sex who, during the last few years, had been much noted on the Continent for the singular boldness with which she had promulgated the wildest doctrines, and the supposed felicity which had attended her vaticinations. She professed belief in all the dogmas that preceded the dawn of modern philosophy; and a strange, vivid, yet gloomy eloquence that pervaded her language gave effect to theories which, while incomprehensible to the many, were alluring to the few. None knew her native country, although she was believed to come from the North of Europe. Her way of life was lonely, her habits eccentric; she sought no companionship; she was beautiful, but not of this earth's beauty; men admired, but courted not; she, at least, lived apart from the reach of human passions.

In fact, the strange Liehbur, for such was the name the prophetness was known by (and she assumed before it the French title of Madame), was not an impostor, but a fanatic: the chords of the brain were touched, and the sound they gave back was erring and imperfect. She was mad, but with a certain method in her madness; a cold, and preternatural, and fearful spirit abode within her, and spoke from her lips -- its voice froze herself, and she was more awed by her own oracles than her listeners themselves.