Demon influence, like the activity of Satan, is prompted by two motives: both to hinder the purpose of God for humanity, and to extend the authority of Satan. They, therefore, at the command of their king, willingly co-operate in all his God-dishonoring undertakings. Their influence is exercised both to mislead the unsaved and to wage an unceasing warfare against the believer (Eph. 6:12). Their motive is suggested in what is revealed by their knowledge of the authority and deity of Christ, as well as by what they know of their eternal doom. The following passages are important in this connection: "And behold, they cried out, saying, What have we to do with thee, Jesus, thou Son of God? art thou come hither to torment us before the time?" (Matt. 8:29). "And there was in their synagogue a man with an unclean spirit; and he cried out, saying, Let us alone; what have we to do with thee, thou Jesus of Nazareth? Art thou come to destroy us? I know thee who thou art, the Holy One of God. And Jesus rebuked him, saying, Hold thy peace, and come out of him" (Mark 1:23-25). "And the evil spirit answered and said, Jesus I know, and Paul I know; but who are ye?" (Acts 19:15). "Thou believest that there is one God; thou doest well: the devils also believe, and tremble" (Jas. 2:19). Of the methods of demons in the latter days of the age, the Scriptures bear special testimony. They will cover their lies with the empty form of religion, and by every means make them to appear as the truth, that they may draw both the saved and the unsaved from their hope in Christ: "Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils; speaking lies in hypocrisy; having their conscience seared with a hot iron" (I Tim. 4: 1, 2). A departure from the true faith is thus predicted to be the evidence of the influence of demons in the last days. This is none other than the great apostasy that must precede the "Day of the Lord" according to II Thes. 2:2, 3. The believer's security in this unceasing warfare is treated at length in another chapter. It may be noted here, however, that the God-appointed means for this victory are prayer and bodily control, "Howbeit this kind goeth not out but by prayer and fasting" (Matt. 17:21); and in the appropriation of the Person of Christ as the believer's sufficiency, as He is set forth in His saving power by the various parts of the "whole armour" of Eph. 6:13-18.