"In contrast to those who keep the commandments of God and have the faith of Jesus, the third angel points to another class, against whose errors a solemn and fearful warning is uttered: “If any man worship the beast and his image, and receive his mark in his forehead, or in his hand, the same shall drink of the wine of the wrath of God.” Revelation 14:9, 10 . A correct interpretation of the symbols employed is necessary to an understanding of this message. What is represented by the beast, the image, the mark? GC 438.1"
"And the third angel followed them, saying with a loud voice, If any man worship the beast and his image, and receive his mark in his forehead, or in his hand,"
EGW directly quotes Revelation 14:9.
"The same shall drink of the wine of the wrath of God, which is poured out without mixture into the cup of his indignation; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb:"
EGW directly quotes Revelation 14:10.
"The line of prophecy in which these symbols are found begins with Revelation 12 , with the dragon that sought to destroy Christ at His birth. The dragon is said to be Satan ( Revelation 12:9 ); he it was that moved upon Herod to put the Saviour to death. But the chief agent of Satan in making war upon Christ and His people during the first centuries of the Christian Era was the Roman Empire, in which paganism was the prevailing religion. Thus while the dragon, primarily, represents Satan, it is, in a secondary sense, a symbol of pagan Rome. GC 438.2"
"And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him."
Ellen White directly references Revelation 12:9 in this passage.