Revelation 7:4

I am one in the choir with Christ dispensing His rewards in heaven, around the unbeginning and never-ending King. I have become the torch-bearer of the unapproachable lights, and I join with their company in the new song of the archangels, showing forth the new grace of the Church; for the Word says that the company of virgins always follow the Lord, and have fellowship with Him wherever He is. And this is what John signifies in the commemoration of the hundred and forty-four thousand.

And I heard the number of those who were sealed, etc. This finite number signifies the innumerable multitude of the whole Church, which is generated from the patriarchs, either by descent of flesh or by imitation of faith. For if you are Christ's, then you are Abraham's seed (Gal. 3). For the increase of perfection, it pertains that twelve is multiplied twelve times, and to the total is perfected as a thousand, which is a solid squared number, signifying the stable life of the Church. Therefore, it is often figured by the number twelve because it stands firm in the faith of the Holy Trinity in a fourfold world. For thrice four is the perfect number, a double portion. Finally, the apostles, who were chosen to preach the same faith to the world, were twelve, indicating by their number the mystery of their work.

"Now, sir," I continued, "explain to me, with respect to the mountains, why their forms are various and diverse." "Listen," he said: "these mountains are the twelve tribes, which inhabit the whole world. The Son of God, accordingly, was preached unto them by the apostles." "But why are the mountains of various kinds, some having one form, and others another? Explain that to me, sir." "Listen," he answered: "these twelve tribes that inhabit the whole world are twelve nations. And they vary in prudence and understanding. As numerous, then, as are the varieties of the mountains which you saw, are also the diversities of mind and understanding among these nations. And I will explain to you the actions of each one." "First, sir," I said, "explain this: why, when the mountains are so diverse, their stones, when placed in the building, became one colour, shining like those also that had ascended out of the pit." "Because," he said, "all the nations that dwell under heaven were called by hearing and believing upon the name of the Son of God. Having, therefore, received the seal, they had one understanding and one mind; and their faith became one, and their love one, and with the name they bore also the spirits of the virgins."