"The same spirit of hatred and opposition to the truth has inspired the enemies of God in every age, and the same vigilance and fidelity have been required in His servants. The words of Christ to the first disciples are applicable to His followers to the close of time: “What I say unto you I say unto all, Watch.” Mark 13:37 . GC 56.3 The darkness seemed to grow more dense. Image worship became more general. Candles were burned before images, and prayers were offered to them. The most absurd and superstitious customs prevailed. The minds of men were so completely controlled by superstition that reason itself seemed to have lost its sway. While priests and bishops were themselves pleasure-loving, sensual, and corrupt, it could only be expected that the people who looked to them for guidance would be sunken in ignorance and vice. GC 57.1"
"And what I say unto you I say unto all, Watch."
Ellen White directly references Mark 13:37 in this passage.
"Another step in papal assumption was taken, when, in the eleventh century, Pope Gregory VII proclaimed the perfection of the Roman Church. Among the propositions which he put forth was one declaring that the church had never erred, nor would it ever err, according to the Scriptures. But the Scripture proofs did not accompany the assertion. The proud pontiff also claimed the power to depose emperors, and declared that no sentence which he pronounced could be reversed by anyone, but that it was his prerogative to reverse the decisions of all others. (See Appendix .) GC 57.2"
"Who opposeth and exalteth himself above all that is called God, or that is worshipped; so that he as God sitteth in the temple of God, shewing himself that he is God."
Both passages describe a figure who exalts himself and claims authority above others, even claiming a position of infallibility. EGW applies 2 Thessalonians 2:4 to the papacy.