Safety not found in miracles

The angel who unites in the proclamation of the third angel's message is to lighten the whole earth with his glory... The great work of the gospel is not to close with less manifestation of the power of God than marked its opening. The prophecies which were fulfilled in the outpouring of the former rain at the opening of the gospel are again to be fulfilled in the latter rain at its close. Here are "the times of refreshing" to which the apostle Peter looked forward when he said: "Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord; and He shall send Jesus." Acts 3:19, 20

Servants of God, with their faces lighted up and shining with holy consecration, will hasten from place to place to proclaim the message from heaven. By thousands of voices, all over the earth, the warning will be given. Miracles will be wrought, the sick will be healed, and signs and wonders will follow the believers. Satan also works, with lying wonders, even bringing down fire from heaven in the sight of men. Revelation 13:13. Thus the inhabitants of the earth will be brought to take their stand.
The Great Controversy 1888, p. 612

God’s people will not find their safety in working miracles, for Satan will counterfeit the miracles that will be wrought.
Last Day Events, p. 169

As spiritualism more closely imitates the nominal Christianity of the day, it has greater power to deceive and ensnare. Satan himself is converted, after the modern order of things. He will appear in the character of an angel of light. Through the agency of spiritualism, miracles will be wrought,the sick will be healed, and many undeniable wonders will be performed. And as the spirits will profess faith in the Bible, and manifest respect for the institutions of the church, their work will be accepted as a manifestation of divine power.... The line of distinction between professed Christians and the ungodly is now hardly distinguishable.   The Great Controversy, p. 588

If those through whom cures are performed are disposed, on account of these manifestations, to excuse their neglect of the law of God and continue in disobedience, though they have power to any and every extent, it does not follow that they have the great power of God. On the contrary, it is the miracle-working power of the great deceiver.—Selected Messages 2:50, 51 (1885).

The Bible will never be superseded by miraculous manifestations. The truth must be studied, it must be searched for as hidden treasure. Wonderful illuminations will not be given aside from the Word or to take the place of it. Cling to the Word, receive the engrafted Word which will make men wise unto salvation.
—Selected Messages 2:48 (1894).

The last great delusion is soon to open before us. Antichrist is to perform his marvelous works in our sight. So closely will the counterfeit resemble the true that it will be impossible to distinguish between them except by the Holy Scriptures. By their testimony every statement and every miracle must be tested.
—The Great Controversy, 593 (1911).