Saint Ephrem the Syrian (Greek: Ἐφραίμ ὁ Σῦρος)
The Antichrist will rule the Church under the guise of truth
In this way he will appear and ascend into the temple of God, in order to sit within, and precisely in the Church of God. He does not deviate (will not deviate) to any other society from heretical sects, so that they would not recognize him, but with contempt rejects all cults (false ones) so that the Church can be captivated. That is why he will ascend into the very temple of God in order to sit down and show himself that he is, as it were, God. How will he show that there is a true God? In addition to the glory and honor with which he will be invested, he will show this even more through the enmity that he will wage against heretical sects. Since he will not incline to any heresy, thanks to his (feigned) love for the children of the Church, he will make him think that he loves them as true (children of the Church), and he will come and sit in their temple, as in the temple of truth, so that show that he is God. He condemns hypocrisy in pretense (feignedly) and puts on the guise of truth in deceit (deceitful). He will pretend so skillfully that he will captivate the people by means of fleshly things and will govern the Church under the guise of truth.
Rev. Ephraim the Syrian
Второе послание к Фессалоникийцам
After three and a half years of power of the unclean
After the fulfillment of three and a half years of the power and actions of the unclean, and when all the temptations of the whole earth are fulfilled, the Lord will finally come according to what has been said, the Lord, like lightning flashing from heaven, our Holy, most pure, terrible and glorious God will come, with incomparable glory, in the precedence of His glory of the ranks of angels and archangels; yet they are a fiery flame; and the river in a terrible gurgling full of fire, the Cherubim with drooping eyes and the Seraphim flying and covering their faces and feet with fiery wings and crying out in trepidation: "Rise, the dead, behold the Bridegroom has come!" Groom; and the darkness of those and thousands of thousands of angels and archangels, countless armies, will rejoice with great joy; the saints and the righteous, and all who have not received the seal of the serpent and the wicked, will rejoice. The tormentor with all the demons, bound by the Angels, also all who have received his seal, all the ungodly and sinners bound, will be brought before the judgment seat. And the King will give them a sentence of eternal condemnation into unquenchable fire. All those who did not accept the seal of the Antichrist and all those who were hiding in the caves will rejoice with the Bridegroom in the eternal and heavenly chamber with all the saints throughout the endless ages of ages.
Rev. Ephraim the Syrian
Слово на пришествие Господне,
на скончание мира и на пришествие антихристово