QUOTE(primordial @ Aug 15 2005, 11:06 PM)
First comes the violation,where a negative spirit is invited through voluntary means, such as a satanic ritual, a OB, or through involuntary means, such as a curse or carry out of an unholy act.
The second stage is invasion, when the demons first disturb a person's house and repress' the individual(s) causing, like u say, depression.
The third stage is domination, when the spirits begin trying to take over the person(s) living in the house.
The final stage, after possession, is Death.
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Most Demonic possession is never actually "invited", through the majority of wrong acts, Demons are said to be able to get in through wrong doings, and weak willed people. For instance, your at your friends house, he has a Video Game you really really want, but you know it's very bad to steal. Going against your own beliefs stealing the game, and opening yourself to evil can expose your body to demonic possession. This is why they say, people that don't beleive in God and the devil, don't much get possessed, because they don't really have a notion, for what is right from wrong, and some theologists believe, that they are what you call "Fully Possessed", because they don't need demonic possession to carry out there acts.
However primordial is very correct that demons can most defiently be brought in through invitation, and also, they can be invited by accident through weak willed, or mis-understanding people. Demons do lie, and once again they will tell you what you want to hear. For instance, things may change once possessed, taking the stealing scenerio, when overcome by evil your mind may change. You may tell yourself " I can steal the game, he has enough money to buy another one anyway."
There are many different cases of Demonic Possession, and all demons work different ways, however, they will lie, and also, try to mix the truth with a lie. For instance, they could say to a priest " Your mother is dead" , well, yes, I know this... " She rotts in hell with satan " , no, she really doesn't. Gotta know when to take the right with the wrong. Demonic Possession goes very deep, and there are many different kinds of Excorcism's. Depending on your religious faiths. Good books on this are " The Devils Hostage" by Father Malachi Martin, and the book Im currently reading, should be done in a day or two "Glimpses of the Devil : A Psychiatrist's Personal Accounts of Possession, Exorcism, and Redemption ".