For many shall come in my name, saying, I am Christ; and shall deceive many.
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Augustine of Hippo
As to wars, when has the earth not been scourged by them at different periods and places? To pass over remote history, when the barbarians were everywhere invading Roman provinces in the reign of Gallienus, how many of our brothers who were then alive do we think could have believed that the end was near, since this happened long after the ascension of the Lord! Thus, we do not know what the nature of those signs will be when the end is really near at hand, if these present ones have not been so foretold that they should at least be understood in the church. Certainly, there are two nations and two kingdoms, namely, one of Christ, the other of the devil. Letter , To Hesychius
But that not all who call on the name of Christ are heard, and that their invocation cannot obtain any grace, the Lord Himself manifests, saying, "Many shall come in my name, saying, I am Christ, and shall deceive many.".
He professes himself to be a Christian in such a way as the devil often feigns himself to be Christ, as the Lord Himself forewarns us, and says, "Many shall come in my name, saying, I am Christ, and shall deceive many."
At the destruction of Jerusalem there appeared many impostors, many who professed themselves to be the Christ, and assured the populace that their delivery was at hand. And in the Church many heresiarchs started up, and many came in the name of Christ; the first of these was Simon Magus, mentioned in the Acts of the Apostles, whom the people of Samaria received as the power and virtue of God. But it is remarkable from the time of our Saviour's passion, when they preferred the robber Barabbas to Jesus Christ, the Lamb of God, they had no peace or quiet in the city, but constant tumult and dissension succeeded, to the very time of its destruction. (Ven. Bede)
So shall many seducers come towards the end of the world, who shall make themselves authors of sects, and shall gain many disciples: as followeth in plain words, ver. 22. of this chapter. (Bristow)