John Chrysostom

"Let no man beguile you in any wise: for it will not be, except the falling away come first, and the man of sin be revealed, the son of perdition, he that opposeth and exalteth himself against all that is called God or that is worshiped; so that he sitteth in the temple of God, setting himself forth as God."

Here he discourses concerning the Antichrist, and reveals great mysteries. What is "the falling away?" He calls him Apostasy, as being about to destroy many, and make them fall away. So that if it were possible, He says, the very Elect should be offended. And he calls him "the man of sin." For he shall do numberless mischiefs, and shall cause others to do them. But he calls him "the son of perdition," because he is also to be destroyed. But who is he? Is it then Satan? By no means; but some man, that admits his fully working in him. For he is a man.