The mark of the beast became Sunday
The paper reduces the mark of the beast to mentally assenting to the papal Sunday. Revelation 13 speaks of loyalty to the beast, and Colossians 2:16 forbids judging anyone because of days.
By Rodrigo Custódio ·
The moment
June 17, 1880. Circulating in Oakland, California, was number 23 of the sixth volume of the Signs of the Times — the weekly founded by James White as the printed voice of the Adventist movement on the American West Coast.
On printed page 266, a series was coming to an end: "The United States in Prophecy," by Elder U. Smith, bearing the chapter notation "(Concluded)." Week after week, the author had developed the Adventist thesis that the two-horned beast of Revelation 13 was the United States and that the country would impose, by force of law, the religious observance of the first day of the week. The final chapter still resorts to the old calculation of the papal title "Vicar of the Son of God" adding up to 666 — a classic piece of nineteenth-century anti-Catholic polemic, presented as numerical confirmation of the thesis.
In this final chapter, Smith responds to an imaginary objector: would it be credible that skeptics, spiritualists, and the irreligious masses would accept a general Sunday law? The author himself admits that his answer is "only conjecture," but insists that the prophecy "must be fulfilled." The mechanism he describes begins within the churches: first, conformity would be wrung from the evangelical denominations — "by persuasion, if possible, by force, if necessary" — and the blow would fall first upon the "conscientious observers of the commandments."
It is within this scenario of future coercion that the paper inserts the theological definition examined in this article: what does it actually mean to receive the mark of the beast on the forehead.

A nineteenth-century stationery shop recreated in a diorama: stamps, ink pads, and stacks of paper — the atmosphere of the era in which the paper stamped Sunday as the mark of the beast.
The absurdity
Read carefully the definition that the paper presented as prophetic truth:
"To receive the mark of the beast in the forehead is, we understand, to give the assent of the mind and judgment to its authority in the adoption of that institution which constitutes the mark."
Source: Signs of the Times, vol. 6, no. 23, June 17, 1880 — p. 266.

The original English passage, underlined, on printed page 266 of the Signs of the Times of June 17, 1880 — the documentary proof of the thesis.
Why this is serious
The maneuver is subtle, but the effect is brutal. Scripture describes the mark as a sign of worship of the beast and of submission to its economic system — "that no man might buy or sell, save he that had the mark" (Rev. 13:17). The paper shifts the meaning of the mark to an institution — the observance of Sunday — and then treats millions of Christians who worship on Sunday as bearers of the sign of perdition, even though they have never heard of the thesis.
The mechanism chosen — "the assent of the mind and judgment" — widens the reach of the terror. One need not consciously worship the beast nor deliberately rebel against God: mental agreement, even inadvertent, with papal authority in the adoption of Sunday is enough. The seal of condemnation comes to fit on anyone's forehead, without their knowing, without their choosing.
And there is the tactic of the test. The author admits, in so many words, that the scenario is "only conjecture" — but he closes the article by "confidently submitting the argument as invulnerable in all its points." The conjecture enters through the back door and leaves through the front door as dogma: what was hypothesis becomes a test of fidelity, and whoever does not believe the test is treated as blind to the "present truth."

A nineteenth-century camp meeting tent at dusk, like those of the gatherings in which Adventist preachers spread the thesis of the mark of the beast.
The pastoral consequence is the inversion of discipleship. Instead of examining whether one worships Christ in spirit and in truth, the reader learns to watch the calendar. Loyalty to Christ is exchanged for loyalty to a day of the week — exactly the kind of legalism that the New Testament combats when it declares that the kingdom of God "is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost" (Rom. 14:17). And the damage is not only doctrinal: entire families learned to measure the salvation of others by the calendar, and brotherly love gave way to eschatological vigilance.
The verdict of Scripture
Revelation 13:16-17 describes the mark as something received "in their right hand, or in their foreheads," linked to the ability to buy and sell and to the worship of the beast — a system of economic and religious loyalty to the antichristian power. The text never mentions Sunday. The paper injects Sunday into the text and then reads the text as proof of Sunday: circular eisegesis, not exegesis.
The warning of Revelation 14:9-11 is against worshiping the beast and his image and receiving his mark — worship, not chronology. Turning the mark into a matter of a day of worship shifts the focus from loyalty to Christ to loyalty to a calendar and accuses of apostasy millions of believers whom the apostle John himself would never accuse.
And Paul is direct: "Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days" (Col. 2:16). If no one may judge a Christian because of days, much less may anyone stamp him as marked by the beast because of the day on which he gathers to worship. Romans 14:5-6 completes it: as for the observance of days, "let every man be fully persuaded in his own mind" — conscience, not the calendar, is the tribunal.
The mark of the beast is worshipful loyalty to the antichristian power — not the day on which the believer gathers to praise God. Whoever turns Sunday into the mark of the beast is not defending the Sabbath: he is accusing brothers in Christ of treason on the basis of a silence of Scripture. And Scripture does not keep silent by chance — it defines the mark with precision, and in that definition there is no calendar. The mark identifies who worships the beast; Sunday identifies when millions worship Christ. Confusing the two is trading worship for the clock — and no clock has ever condemned or saved anyone.