Revelation 21:2

From the seventh verse of the foregoing chapter, begins as it were the third part of the Apocalypse containing the coming of antichrist, the great day of judgment, the punishment of the wicked, and the eternal happiness of God's elect in heaven, or in the celestial Jerusalem, which St. John describes in this chapter as if it were like a large city, beautified and enriched with gold and all manner of precious stones, &c. (Witham)

Coming down from God out of heaven. By the city we must understand its citizens, the Angels and saints. (Witham) --- Justice, innocence, the good works of the saints, are the ornaments of the inhabitants of this new Jerusalem, the Church triumphant. If the world of the old Adam has appeared so beautiful, so magnificent, good God, what will be the riches of that which is made for Jesus Christ, the second Adam, and for his members! O Jesus! Father of the world to come, render us worthy of this new and everlasting world, and give us a disgust, a mortal hatred, for that which perishes, and which is the cause of our perdition.