Ambrose of Milan — as excerpted in the Catena Aurea on Luke 21:25-27

“So severe then will be the manifold fires of our souls, that with consciences depraved through the multitude of crimes, by reason of our fear of the coming judgment, the dew of the sacred fountain will be dried upon us. But as the Lord’s coming is looked for, in order that His presence may dwell in the whole circle of mankind or the world, which now dwells in each individual who has embraced Christ with his whole heart, so the powers of heaven shall at our Lord’s coming obtain an increase of grace, and shall be moved by the fulness of the Divine nature more closely infusing itself. There are also heavenly powers which proclaim the glory of God, which shall be stirred by a fuller infusion of Christ, that they may see Christ.”