"Don't let anyone deceive you in any way, for that day will not come until the rebellion occurs and the man of lawlessness is revealed, the man doomed to destruction. He will oppose and will exalt himself over everything that is called God or is worshiped, so that he sets himself up in God's temple, proclaiming himself to be God ...and now you know what is holding him back, so that he may be revealed at the proper time. For the secret power of lawlessness is already at work; but the one who now holds it back will continue to do so till he is taken out of the way. And then the lawless one will be revealed, whom the Lord Jesus will overthrow by the splendor of his coming. The coming of the lawless one will be in accordance with the work of Satan displayed in all kinds of counterfeit miracles, signs and wonders, and in every sort of evil that deceives those who are perishing. They perish because they refused to love the truth and so be saved. For this reason God sends them a powerful delusion so that they will believe the lie and so that all will be condemned who have not believed the truth but have delighted in wickedness" (II Thes. 2:3-4; 6-12).
In Matthew 24 and in Luke 21 Jesus warns His followers that in the last days they must be prepared for a universal sweep of deception driven by hosts of evil spirits designed to snare both sinners and saints, even "to the very elect." "For it will come upon all those who live on the face of the whole earth," He said (Luke 21:35).
The apostle Paul wrote his second epistle to the Thessalonians from Corinth only a few months after he wrote the first. He wrote the second time to correct their misunderstanding of his first letter. Paul had learned that many of the Thessalonian believers had taken his teachings on the imminence of the Second Coming of Christ so seriously that some had quit their jobs, grown antisocial and gone into hibernation to await the coming of Christ. Paul wrote his second letter to tell them to come out of hiding, rejoin the body of Christ in worship and loving fellowship, go back to work and prepare more responsibly for the Second Coming of Christ.
But Paul also wrote his second letter to the Thessalonians to brace them for the darkness and deception that would sweep all nations and cultures in the last days preceding the revelation of the AntiChrist.