14 Behold, that form of man will be seen by the godly and by the wicked, by the just and the unjust, by the believers and unbelievers, by those that rejoice and by those that mourn, by them that trusted and by them that are confounded: lo, seen it will be. When that form shall have appeared in the judgment, and the judgment shall have been finished, where it is said that the Father judges not any, but has given all judgment to the Son, for this reason, that the Son will appear in the judgment in that form which He took from us.
What shall be after this? When shall be seen the form of God, which all the faithful are thirsting to see? When shall be seen that Word which was in the beginning, God with God, by which all things were made? When shall be seen that form of God, of which the apostle says, “Being in the form of God, He thought it not robbery to be equal with God”? For great is that form, in which, moreover, the quality of the Father and Son is recognized; ineffable, incomprehensible, most of all to little ones.
When shall this form be seen? Behold, on the right are the just, on the left are the unjust; all alike see the man, they see the Son of man, they see Him who was pierced, Him who was crucified they see: they see Him that was made low, Him who was born of the Virgin, the Lamb of the tribe of Judah they see. But when will they see the Word, God with God? He will be the very same even then, but the form of a servant will appear. The form of a servant will be shown to servants: the form of God will be reserved for sons.
Wherefore let the servants be made sons: let them who are on the right hand go into the eternal inheritance promised of old, which the martyrs, though not seeing, believed, for the promise of which they poured out their blood without hesitation; let them go there and see there. When shall they go there? Let the Lord Himself say: “So those shall go into everlasting burning, but the righteous into life eternal.”
Source: Tractates on the Gospel of John (New Advent)