1. Through generations:   Demons may oppress or possess a person because of previous possession or oppression of the parents. This accounts for demonic influence over children (Exodus 20:5; 34:7; Deuteronomy 5:9).
  1. Through the mind:   The mind is one of the major battlefields of Satan. If Satan controls your thoughts, he will eventually control your actions. Demons also gain access through mind-altering drugs which reduce the ability to resist demons and grant increasing access.
  1. Through sinful actions:   Sinful thoughts are soon fulfilled by sinful actions. For example, the thought of adultery is fulfilled in the actual act of adultery. Sin is rebellion, and rebellious thoughts and actions provide an entry point for demonic activity.
  1. Through Ungodly soul ties:   Ungodly relationships with friends, associations with people in sin, sexual sin, accepting verbal curses.
  1. Through desire:   Some people ask Satan for demonic power to enable them to perform supernatural acts.  This is done by some gamers that compete for fame or money.
  1. Through an empty house:   Demons consider the body of the person they inhabit as their own house (Matthew 12:44). When a person who is delivered from demonic powers does not fill his house with the new birth experience and the infilling of the Holy Spirit, reentry can occur.
  1. Through permission:   Sometimes God grants permission for demonic powers to accomplish special purposes. This can be evidenced by a trial — as in the case of Job — or judgment for sin — as in the example of King Saul’s experience with the witch of Endor (1 Samuel 28).