Apocalypse 7:4

“I understand, sir,” I replied. “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. …

These, O fair virgins, are the orgies of our mysteries; these the mystic rites of those who are initiated in virginity; these the “undefiled rewards” of the conflict of virginity. I am be trothed to the Word, and receive as a reward the eternal crown of immortality and riches from the Father; and I triumph in eternity, crowned with the bright and unfading flowers of wisdom. 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.

That people which was called of old the people of God was divided into twelve tribes, and over and above the other tribes it had the levitical order, which itself again carried on the service of God in various priestly and levitical suborders. In the same manner, it appears to me that the whole people of Christ, when we regard it in the aspect of the hidden man of the heart, that people which is called “Jew inwardly,” and is circumcised in the spirit, has in a more mystic way the characteristics of the tribes. This may be more plainly gathered from John in his Apocalyse, though the other prophets also do not by any means conceal the state of matters from those who have the faculty of hearing them. …

These, then, who are sealed on their foreheads from every tribe of the children of Israel, are a hundred and forty-four thousand in number; and these hundred and forty-four thousand are afterwards said in John to have the name of the Lamb and of His Father written on their foreheads, and to be virgins, not having defiled themselves with women. What else could the seal be which is on their foreheads but the name of the Lamb and the name of His Father? In both passages their foreheads are said to have the seal; in one the seal is spoken of, in the other it appears to contain the letters forming the name of the Lamb, and the name of His Father. Now these taken from the tribes are, as we showed before, the same persons as the virgins. …

51. In the next place, our author calls those numbers legitimate which Holy Scripture more highly favors such as seven, or ten, or twelve, or any of the other numbers which the diligent reader of Scripture soon comes to know. Now numbers of this sort are often put for time universal; as for example, “Seven times in the day do I praise Thee,” means just the same as “His praise shall continually be in my mouth.” And their force is exactly the same, either when multiplied by ten, as seventy and seven hundred (whence the seventy years mentioned in Jeremiah may be taken in a spiritual sense for the whole time during which the Church is a sojourner among aliens); or when multiplied into themselves, as ten into ten gives one hundred, and twelve into twelve gives one hundred and forty-four, which last number is used in the Apocalypse to signify the whole body of the saints. …