It is actually the case that demonisation is not usually the slightest bit obvious at all. After all, if it was then what need would there be for the gift of the Holy Spirit of the discerning of spirits, which is given, in part, for the precise purpose of ascertaining whether someone is demonised or not? That particular gift is here examined in detail, as is the important point that it has an application far wider than merely establishing whether or not individuals have evil spirits. That application may well surprise you, but every Christian does need to know a bit about it.