In this age antichrist will appear as the true Christ, and then the law of God will be fully made void in the nations of our world. Rebellion against God's holy law will be fully ripe. But the true leader of all this rebellion is Satan clothed as an angel of light. Men will be deceived and will exalt him to the place of God, and deify him. But Omnipotence will interpose, and to the apostate churches that unite in the exaltation of Satan, the sentence will go forth, “Therefore shall her plagues come in one day, death, and mourning, and famine; and she shall be utterly burned with fire: for strong is the Lord God who judgeth her.”—Testimonies to Ministers and Gospel Workers, 62. TA 268.4
Disguised as an angel of light, he [Satan] will walk the earth as a wonder-worker. In beautiful language he will present lofty sentiments. Good words will be spoken by him, and good deeds performed. Christ will be personified, but on one point there will be a marked distinction. Satan will turn the people from the law of God. Notwithstanding this, so well will he counterfeit righteousness, that if it were possible, he would deceive the very elect. Crowned heads, presidents, rulers in high places, will bow to his false theories.—The Review and Herald, August 17, 1897. TA 269.1
It is impossible to give any idea of the experience of the people of God who shall be alive upon the earth when celestial glory and a repetition of the persecutions of the past are blended. They will walk in the light proceeding from the throne of God. By means of the angels there will be constant communication between heaven and earth. And Satan, surrounded by evil angels, and claiming to be God, will work miracles of all kinds, to deceive, if possible, the very elect. God's people will not find their safety in working miracles, for Satan will counterfeit the miracles that will be wrought.—Testimonies for the Church 9:16. TA 269.2
Satan is preparing his deceptions that in his last campaign against the people of God, they may not understand that it is he. “And no marvel; for Satan himself is transformed into an angel of light.” ... Satan will go to the extent of his power to harass, tempt, and mislead God's people.—The Review and Herald, May 13, 1862. TA 270.1
Satan ... will come personating Jesus Christ, working mighty miracles; and men will fall down and worship him as Jesus Christ. We shall be commanded to worship this being, whom the world will glorify as Christ. What shall we do?—Tell them that Christ has warned us against just such a foe, who is man's worst enemy, yet who claims to be God.—The Review and Herald, December 18, 1888. TA 270.2
The time is coming when Satan will work miracles right in your sight, claiming that he is Christ; and if your feet are not firmly established upon the truth of God, then you will be led away from your foundation.—The Review and Herald, April 3, 1888. TA 270.3
In the last days he [Satan] will appear in such a manner as to make men believe him to be Christ come the second time into the world. He will indeed transform himself into an angel of light. But while he will bear the appearance of Christ in every particular, so far as mere appearance goes, it will deceive none but those who ... are seeking to resist the truth.—Testimonies for the Church 5:698. TA 270.4