237. Among the difficulties incident to practical Spiritism, we must place in the first rank, obsession, that is to say, the empire exercised by certain spirits over certain men. Obsession is always the work of inferior spirits, ambitious of keeping human beings under their power Superior spirits desire no such tyrannical influence, but content themselves with giving good advice and combating the evil influence  lower spirits; if we fail to give heed to them, they retire. Bad spirits, on the contrary, attach themselves obstinately to the human being over whom they obtain a hold; identifying themselves with his spirit, and leading him as you lead a child. Obsession presents various characters which it is very important to distinguish, as they result both from the degree of restraint exercised by the obsessor, and from the nature of the effects produced by his action. The word obsession is a generic term, designating a phenomenon, of which the principal varieties are: Simple Obsession, Fascination, and Subjugation.