John Chrysostom
“That they may be condemned.” He did not say, “that they may receive punishment,” since punishment awaited them even apart from this. Rather, he says, “that they may be condemned,” that is, condemned at that fearful tribunal, so that they may be without answer. “But those,” he says, “who loved unrighteousness.” Antichrist will come for the destruction of mankind, to inflict wrongs upon men. Indeed, what will he not do at that time? He will bring everything into tumult and confusion, both by his commands and by fear. He will be terrible in every respect: in his authority, his cruelty, and his lawless commands. But do not fear. He will have power, says the Apostle, only over those who are perishing. And Elijah will then come to support the believers.
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Christ says of this, “Elijah is to come first and restore all things” (Mt 17:11). Therefore it is said of John that he would go before the Lord “in the spirit and power of Elijah” (Lk 1:17), since he performed neither signs like Elijah nor wonders. “John,” it is said, “did no sign, but everything John said about Him was true” (Jn 10:41). What then do the words “in the spirit and power of Elijah” mean? They mean that John would fulfill the same ministry. As John was the forerunner of the first coming of Christ, so Elijah will be the forerunner of His second and glorious coming, and he is kept for this purpose. Therefore let us fear nothing. The Apostle disturbed the minds of his hearers, but he did not make them regard their present condition as wretched. On the contrary, he showed that they ought to thank God for it. Therefore he added, “But we ought always to thank God for you, brethren beloved by the Lord, because God chose you from the beginning for salvation, through sanctification of the Spirit and faith in the truth” (2 Thess 2:13).