Gregory the Great — on Ezek 1:4 (Homilies on Ezekiel, Book 1, Homily 2)

“But if anyone wishes to understand these things which we have said about the Lord's first coming also concerning His second coming, he is to be followed with swift agreement, because often the spirit of prophecy in one thing it speaks beholds many things at once. For the whirlwind comes from the North, because indeed the cause of sins demands that the shaking of strict judgment disturb all the elements together. For the terror of the final disturbance is said to come from where it is generated. For since the judgment of final disturbance is carried out to strike the cold minds of sinners, rightly the whirlwind is said to come from the North. This shaking is aptly called a whirlwind, because on that day the hearts of all who shall then be found in mortal flesh will be moved with excessive fear. For when what is written begins to be fulfilled: "The sun shall be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken," what mind of man will there be that does not dread the sentence of the eternal Judge? For there then all sins at once return before the eyes, there all things which were done with delight are recalled to memory with fear, there is the darkness of miserable thought from the punishment of approaching damnation. Whence it is also added: "And a great cloud." For then from the memory of sins the darkness of blindness weighs down the perception of the mind, when the reprobate are not permitted to behold the only-begotten Son of God in the form of divinity. For "they shall look upon Him whom they pierced." And, "Let the ungodly be taken away, lest he see the glory of God." Where it is also openly added: "And fire enfolding itself." Because indeed that fire of judgment, which will burn up the aerial heaven and the earth, will no longer permit sinners to be raised up in their pride, but will enfold them, whom without doubt it will crush in the punishment of their damnation. And there was splendor all around it. For just as lightning goes out from the East and appears even to the West, so will be the coming of the Son of Man. Where no one is then permitted to hide in his mind from the judgment, because he is penetrated by the very brilliance of the Judge. Concerning this it is soon added: "And in its midst was something like the appearance of electrum," that is, from the midst of the fire. For He Himself, our Redeemer, presiding over angels and archangels and all the powers, who as in the likeness of electrum remained one from both and in both natures, both God with the Father, and for our redemption was made mortal with men, will then be seen in His terror, and the fire of judgment will serve Him in vengeance upon the reprobate. For thus it is written: "The day of the Lord will make clear because it will be revealed in fire." Thus the Psalmist says: "God will come manifestly, our God, and He will not be silent; fire will burn in His sight, and around Him will be a mighty storm." Thus the apostle Peter says: "The day of the Lord will come as a thief, in which the heavens will pass away with great violence, and the elements will be dissolved by the heat of fire."”