Before the close of time he [Satan] will work still greater wonders. So far as his power extends, he will perform actual miracles. Says the Scripture: “He ... deceiveth them that dwell on the earth by the means of those miracles which he had power to do,” not merely those which he pretends to do. Something more than mere impostures is brought to view in this scripture.—Testimonies for the Church 5:698. TA 264.2
We need not be deceived. Wonderful scenes, with which Satan will be closely connected, will soon take place. God's Word declares that Satan will work miracles. He will make people sick, and then will suddenly remove from them his satanic power. They will then be regarded as healed. These works of apparent healing will bring Seventh-day Adventists to the test.—Selected Messages 2:53. TA 264.3
Some will be tempted to receive these wonders as from God. The sick will be healed before us. Miracles will be performed in our sight. Are we prepared for the trial which awaits us when the lying wonders of Satan shall be more fully exhibited? Will not many souls be ensnared and taken? By departing from the plain precepts and commandments of God, and giving heed to fables, the minds of many are preparing to receive these lying wonders. We must all now seek to arm ourselves for the contest in which we must soon engage. Faith in God's Word, prayerfully studied and practically applied, will be our shield from Satan's power and will bring us off conquerors through the blood of Christ.—Testimonies for the Church 1:302. TA 265.1