"The editor of The Catholic Mirror of Baltimore, MD, published a series of four editorials, which appeared in that paper, September 2, 9, 16 and 23, 1893. . . . These articles, therefore, although not written by the Cardinal’s (Gibbons) own hand, appear under his official sanction, and are the expression of the Papacy on this subject, are the open challenge of the Papacy to Protestantism, and the demand of the Papacy that Protestants shall render to the Papacy an account of why they keep Sunday. . . .

"The Adventists are the only body of Christians with the Bible as their teacher, who can find no warrant in its pages for the change of the day from the seventh to the first. Hence their appellation, ‘Seventh-day Adventists’. Protestants. . . have rejected the day named for His worship by God, and assumed, in apparent contradiction of His command, a day for His worship never once referred to for that purpose, in the pages of that Sacred Volume. . . . 

"But the truth, fact, and right, a strict sense of justice forbids the condemnation of this little sect [Seventh-day Adventists today number over 12 million] without a calm unbiased investigation. . . .

"The Protestant world has been, from its infancy, in the 16th century, in thorough accord with the Catholic Church, in keeping ‘holy’ not Saturday, but Sunday." 

"If. . .on the other hand, the latter (Israelites and Adventists) furnish arguments, incontrovertible by the great body of Protestants. . . [Protestants] have no other resource left than the admission that they have been teaching and practicing what is Scripturally false for over three centuries. . . . 

"To add to the intensity of this Scriptural and unpardonable blunder, it involves one of the most positive and emphatic commands of God to His servant, man: ‘Remember the Sabbath day, to keep it holy.’ (the 7th day) No Protestant (except for the Adventists and a few others) living today has ever yet obeyed that command, preferring to follow the apostate church referred to than his teacher, the Bible, which, from Genesis to Revelation, teaches no other doctrine. . . ." Rome’s Challenge, 1–5. 

"Hence the conclusion is inevitable; that is, that of those who follow the Bible as their guide, the Israelites and Seventh-day Adventists have the exclusive weight of evidence on their side, whilst the Biblical Protestant has not a word in self-defense for his substitution of Sunday for Saturday." Ibid., 11.