Joseph Thomas Sheridan Le Fanu was the leading ghost-story writer of the nineteenth century and was central to the development of the genre in the Victorian era.

From Green Tea
The evil spirits associated with man are, indeed from the hells, but when with man they are not then in hell, but are taken out thence. The place where they then are, is in the midst between heaven and hell, and is called the world of spirits – when the evil spirits who are with man, are in that world, they are not in any infernal torment, but in every thought and affection of man, and so, in all that the man himself enjoys. But when they are remitted into their hell, they return to their former state… .
If evil spirits could perceive that they were associated with man, and yet that they were spirits separate from him, and if they could flow in into the things of his body, they would attempt by a thousand means to destroy him; for they hate man with a deadly hatred… .
Knowing, therefore, that I was a man in the body, they were continually striving to destroy me, not as to the body only, but especially as to the soul; for to destroy any man or spirit is the very delight of the life of all who are in hell; but I have been continually protected by the Lord. Hence it appears how dangerous it is for man to be in a living consort with spirits, unless he be in the good of faith… .
Nothing is more carefully guarded from the knowledge of associate spirits than their being thus conjoint with a man, for if they knew it they would speak to him, with the intention to destroy him… .