But Christians of past generations observed the Sunday, supposing that in so doing they were keeping the Bible Sabbath; and there are now true Christians in every church, not excepting the Roman Catholic communion, who honestly believe that Sunday is the Sabbath of divine appointment. God accepts their sincerity of purpose and their integrity before Him. But when Sunday observance shall be enforced by law, and the world shall be enlightened concerning the obligation of the true Sabbath, then whoever shall transgress the command of God, to obey a precept which has no higher authority than that of Rome, will thereby honor popery above God. He is paying homage to Rome and to the power which enforces the institution ordained by Rome. He is worshiping the beast and his image. As men then reject the institution which God has declared to be the sign of His authority, and honor in its stead that which Rome has chosen as the token of her supremacy, they will thereby accept the sign of allegianc…
"And the times of this ignorance God winked at; but now commandeth all men every where to repent:"
EGW's statement about God accepting sincerity during times of ignorance echoes the principle in Acts 17:30 where God overlooked past ignorance but now calls for repentance. Both highlight God's understanding of unintentional wrongdoing before greater knowledge is available.
"The most fearful threatening ever addressed to mortals is contained in the third angel's message. That must be a terrible sin which calls down the wrath of God unmingled with mercy. Men are not to be left in darkness concerning this important matter; the warning against this sin is to be given to the world before the visitation of God's judgments, that all may know why they are to be inflicted, and have opportunity to escape them. Prophecy declares that the first angel would make his announcement to “every nation, and kindred, and tongue, and people.” The warning of the third angel, which forms a part of the same threefold message, is to be no less widespread. It is represented in the prophecy as being proclaimed with a loud voice, by an angel flying in the midst of heaven; and it will command the attention of the world. GC 449.2"
"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, 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:"
The EGW passage directly references and interprets Revelation 14:9-10, focusing on the warning against worshipping the beast and receiving its mark, and the consequences of doing so. The passage emphasizes the severity of the sin and the unmixed wrath of God, which aligns with the biblical text.
"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,"
The EGW passage explicitly refers to the first angel's message being proclaimed to "every nation, and kindred, and tongue, and people," which is a direct quote from Revelation 14:6. It connects this with the third angel's message, arguing for its equally widespread proclamation.