The reality and personality of this host of evil spirits is taught in Scripture; and a careful study of the numerous passages in which they are mentioned will reveal how God has provided complete instruction in His Word concerning this theme on which so much of the believer's welfare depends. These spirits are usually referred to in both the Authorized and Revised Versions of the New Testament as "devils," but the word might better have been translated "demons." In considering the service these beings render to Satan, it is important to distinguish between demon possession or control, and demon influence. In the one case the body is entered and a dominating control is gained: while in the other case a warfare from without is carried on by suggestion, temptation, and influence. Investigation of the Scriptures in regard to demon possession reveals: First: That this host is made up of bodiless spirits only. The following Scripture verifies this statement: "When the unclean spirit is gone out of a man, he walketh through dry places, seeking rest, and findeth none. Then he saith, I will return into my house from whence I came out; and when he is come, he findeth it empty, swept, and garnished. Then goeth he, and tak'eth with himself seven other spirits more wicked than himself, and they enter in and dwell there: and the last state of that man is worse than the first" (Matt. 12:43-45). "And all the devils besought him, saying, Send us into the swine, that we may enter into them" (Mark 5:12).