"falling away first, and that man of sin be revealed, the son of perdition; who opposeth and exalteth himself above all that is called God, or that is worshiped; so that he as God sitteth in the temple of God, showing himself that he is God.” And furthermore, the apostle warns his brethren that “the mystery of iniquity doth already work.” 2 Thessalonians 2:3, 4, 7 . Even at that early date he saw, creeping into the church, errors that would prepare the way for the development of the papacy. GC 49.1"
"Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;"
EGW directly quotes 2 Thessalonians 2:3, making this a clear and explicit allusion.
"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."
The EGW passage directly quotes 2 Thessalonians 2:4.
"For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way."
EGW directly quotes 2 Thessalonians 2:7, making this a clear and explicit allusion.