John Chrysostom
When the Lord had finished all that related to Jerusalem, He came in the rest to His own coming, and gives them signs thereof, useful not for them only, but for us and for all who shall be after us. As above, the Evangelist said, In those days came John the Baptist, (Mat. 3:1.) not implying immediately after what had gone before, but thirty years after; so here, when He says Then, He passes over the whole interval of time between the taking of Jerusalem and the beginnings of the consummation of the world. Among the signs which He gives of His second coming He certifies them concerning the place, and the deceivers.
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For it shall not be then as at His former coming, when He appeared in Bethlehem, in a corner of the world, unknown of any; but He shall come openly so as not to need any to announce His approach, wherefore, If any man shall say unto you, Lo, here is Christ, or there, believe not.
He speaks here of Antichrist, and of certain his ministers, whom He calls false Christs and false prophets, such as were many in the time of the Apostles; but before Christ’s second coming there shall come others more bitter than the former, And they shall shew great signs and wonders. (cf. 2 Thes. 2:8.)
As He had above described in what guise Antichrist should come, so here He describes how He Himself shall come. For as the lightning needeth none to herald or announce it, but is in an instant of time visible throughout the whole world, even to those that are sitting in their chambers, so the coming of Christ shall be seen every where at once, because of the brightness of His glory. Another sign He adds of His coming, Wheresoever the body is, thither will the eagles be gathered together. The eagles denote the company of the Angels, Martyrs, and Saints.