Bede the Venerable — as excerpted in the Catena Aurea on Mark 13:21-27

“By the four winds, He means the four parts of the world, the east, the west, the north, and the south. And lest any one should think that the elect are to be gathered together only from the four edges of the world, and not from the midland regions as well as the borders, He has fitly added, From the uttermost part of earth, to the uttermost part of heaven, that is, from the extremities of the earth to its utmost bounds, where the circle of the heavens appears to those who look from afar to rest upon the boundaries of the earth. No one therefore shall be elect in that day who remains behind and does not meet the Lord in the air, when He comes to judgment. The reprobate also shall come to judgment, that when it is finished they may be scattered abroad and perish from before the face of God.”