For they are spirits of demons, performing signs, which go out to the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty.--Revelation 16:14
Fearful sights of a supernatural character will soon be revealed in the heavens, in token of the power of miracle-working demons. The spirits of devils will go forth to the kings of the earth and to the whole world, to fasten them in deception, and urge them to unite with Satan in his last struggle against the government of heaven. By these agencies, rulers and subjects will be alike deceived.
Persons will arise pretending to be Christ Himself, and claiming the title and worship which belongs to the world's Redeemer. They will perform wonderful miracles of healing and will profess to have revelations from heaven contradicting the testimony of the Scriptures. (The Great Controversy, 624)
We would lose faith and courage in the conflict if we were not sustained by the power of God. Every form of evil is to spring into intense activity. Evil angels unite their powers with evil men and, as they have been in constant conflict and attained an experience in the best modes of deception and battle, and have been strengthening for centuries, they will not yield the last great final contest without a desperate struggle.
All the world will be on one side or the other of the question. The battle of Armageddon will be fought. And that day must find none of us sleeping. Wide awake we must be, as wise virgins having oil in our vessels with our lamps. What is this? Grace, grace! The power of the Holy Ghost must be upon us and the Captain of the Lord's host will stand at the head of the angels of heaven to direct the battle. (Letter 112, December 22, 1890)
REFLECTION: The battle of Armageddon is soon to be fought. He on whose vesture is written the name, King of Kings and Lord of lords, leads forth the armies of heaven on white horses, clothed in fine linen, clean and white. (Manuscript 172, 1899)