John Damascene

In his own words on 2 Thessalonians

• 2 Thessalonians 2:4

  And the apostle says: 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: who opposeth and exalteth himself above all that is called God or that is worshipped, so that he sitteth in the temple of God, shewing himself that he is God; in the temple of God he said; not our temple, but the old Jewish temple. For he will come not to us but to the Jews: not for Christ or the things of Christ: wherefore he is called Antichrist.

  An Exact Exposition of the Orthodox Faith, Book IV

• 2 Thessalonians 2:11

  One should know that the Antichrist must come. Antichrist, to be sure, is everyone who does not confess that the Son of God came in the flesh, is perfect God and became perfect man while at the same time he was God. In a peculiar and special sense, however, he who is to come at the consummation of the world is called Antichrist. So, it is first necessary for the gospel to have been preached to all the Gentiles, as the Lord said, and then God shall proceed to the conviction of the impious Jews.… "Because they refused to love the truth and so be saved. Therefore God sends upon them a strong delusion, to let them believe what is false, so that all may be condemned who did not believe the truth but had pleasure in unrighteousness."

  The Orthodox Faith 4.26