Augustine of Hippo
Catena Aurea · Markusevangelium 13
And then if any man shall say to you, Lo, here is Christ; or, lo, he is there; believe him not: For false Christs and false prophets shall rise, and shall shew signs and wonders, to seduce, if it were possible, even the elect. But take ye heed: behold, I have foretold you all things. But in those days, after that tribulation, the sun shall be darkened, and the moon shall not give her light, And the stars of heaven shall fall, and the powers that are in heaven shall be shaken. And then shall they see the Son of man coming in the clouds with great power and glory. And then shall he send his angels, and shall gather together his elect from the four winds, from the uttermost part of the earth to the uttermost part of heaven.
(de Trin. i. 13) For the vision of the Son of Man is shewn even to the bad, but the vision of the form of God to the pure in heart alone, for they shall see God. (Matt. 5:8) And because the wicked cannot see the Son of God, as He is in the form of God, equal to the Father, and at the same time both just and wicked are to see Him as Judge of the quick and dead, before Whom they shall be judged, it was necessary that the Son of Man should receive power to judge. Concerning the execution of which power, there is immediately added, And then shall he send his angels.