Then He shall gather together all nations, as the holy Gospel so strikingly declares. For what says Matthew the evangelist, or rather the Lord Himself, in the Gospel? “When the Son of man shall come in His glory, and all the holy angels with Him, then shall He sit upon the throne of His glory: and before Him shall be gathered all nations; and He shall separate them one from another, as a shepherd divides his sheep from the goats: and He shall set the sheep on His right hand, but the goats on the left. Then shall the King say unto them on His right hand, Come, you blessed of my Father, inherit the kingdom prepared for you from the foundation of the world.” Come, you prophets, who were cast out for my name's sake. Come, you patriarchs, who before my advent were obedient to me, and longed for my kingdom. Come, you apostles, who were my fellows in my sufferings in my incarnation, and suffered with me in the Gospel. Come, you martyrs, who confessed me before despots, and endured many torments and pains. Come, you hierarchs, who did me sacred service blamelessly day and night, and made the oblation of my honourable body and blood daily.
Source: The End of the World (Pseudonymous) (New Advent)