The commission He gave to the twelve, and to the seventy, was exactly in line with His own. He sent them forth, and “gave them authority over unclean spirits, to cast them out, and to preach the gospel” (Matt. 10: 1); to “first bind the strong man” (Mark 3: 27), and then to take his goods; to deal with the invisible hosts of Satan first, and then “preach the gospel.”
From all this we learn that there is one Satan, one devil, one prince of the demons, directing all the opposition to Christ and His people; but myriads of wicked spirits called “demons,” lying spirits, deceiving spirits, foul spirits, unclean spirits, subjectively at work in men. Who they are, and whence their origin, none can positively say. That they are spirit beings who are evil is alone beyond all doubt; and all who are undeceived and dispossessed from Satanic deception, become witnesses, from their own experience, to their existence, and power. They know that things were done to them by spirit beings, and that those things were evil; therefore they recognize that there are spirit beings who do evil, and know that the symptoms, effects and manifestations of demoniacal possession have active, personal agencies behind them. From experience they know that they are hindered by spirit beings, and therefore know that these things are done by evil spirits who are hinderers. Therefore, reasoning from experimental facts, as well as the testimony of Scripture, they know that these evil spirits are murderers, tempters, liars, accusers, counterfeiters, enemies, haters, and wicked beyond all the power of man to know.
The names of these evil spirits describe their characters, for they are called “foul,” “lying,” “unclean,” “evil,” and “deceiving” spirits, as they are wholly given up to every manner of wickedness, and deception, and lying works. – Jessie Penn-Lewis; War On The Saints Chapter 2
Recovered In Christ 
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