"The message of the third angel is to prepare a people to stand in these days of peril. It is to be proclaimed with a loud voice and is to accomplish a work which few realize. 8T 94.1"
"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 references the third angel's message and its proclamation with a loud voice, which is a key element of Revelation 14:9. The connection is direct and meaningful.
"John writes: “I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people, saying with a loud voice, Fear God, and give glory to Him; for the hour of His judgment is come: and worship Him that made heaven, and earth, and the sea, and the fountains of waters. And there followed another angel, saying, Babylon is fallen is fallen, that great city, because she made all nations drink of the wine of the wrath of her fornication.” Revelation 14:6-8 . How is this done? By forcing men to accept a spurious sabbath. In the thirty-first chapter of Exodus we are plainly told which day is the Sabbath of the Lord. The keeping of the Sabbath is declared to be a sign of the loyalty of God's people. 8T 94.2"
"And I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people,"
EGW quotes Revelation 14:6 verbatim. This is a clear and direct allusion.
"And I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people, Saying with a loud voice, Fear God, and give glory to him; for the hour of his judgment is come: and worship him that made heaven, and earth, and the sea, and the fountains of waters. And there followed another angel, saying, Babylon is fallen, is fallen, that great city, because she made all nations drink of the wine of the wrath of her fornication."
Ellen White directly references Revelation 14:6-8 in this passage.
"God means just what He says. Man has interposed between God and the people, and the Lord has sent forth the third angel with the message: “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, 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.” Verses 9, 10 . 8T 94.3"
"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, making this an explicit allusion.