Ezekiel 40:5

While reading the description of the mystical temple (which the Jews believe should be built literally upon the coming of their own Christ, whom we believe to be the Antichrist, but we refer to the Church of Christ, which we see being built daily in his saints), whenever the eye of the heart opens, it happens to me that I think I see and possess the bridegroom and joyfully say: 'I have found him whom my soul loves; I will hold him, and not let him go.' (Song of Solomon 3:4).

(Verse 5 and following) And behold, there was a wall surrounding the house on all sides, and in the hand of the man was a measuring reed of six cubits and a handbreadth, and he measured the width of the building with the reed, one reed wide, and the height with the reed, one reed high. And he came to the gate that faced the eastern road, and he went up its steps, and he measured the threshold of the gate with the reed, one reed wide, that is, one reed wide, and the vestibule one reed long, and one reed wide, and between the vestibules five cubits, and the threshold of the gate next to the entrance of the gate inside, one reed wide. And the vestibule of the gate was eight cubits, and the front of it two cubits: but the gate itself was inward. And the chambers of the gate towards the east, three on this side, and three on that side; they measured one against another: and the fronts of the gate on both sides were of one measure. And he measured the length of the porch of the gate, ten cubits: and the breadth of the gate, thirteen cubits. And there was also a space before the chambers, one cubit on this side, and one cubit on that side: and the chambers six cubits on this side, and six cubits on that side. And he measured the gate from the roof of the chamber to its roof, a width of twenty-five cubits, door against door. Seventy: And behold, a wall on the outside of the house all around, and in the man's hand a measuring reed of six cubits and a handbreadth. So he measured the thickness of the wall, one reed; and the height, one reed. Then he went inside the gateway which faced toward the east, went up its stairs and measured the threshold of the gateway, which was one reed wide, and the other threshold was one reed wide. Each gate chamber was one reed long and one reed wide; between the gate chambers were five cubits. […]

Generally in sacred Scripture the incarnate Lord Himself is accustomed to be called a wall from the protection of His defense, just as it is said of holy Church through the prophet: "A wall and a rampart shall be set in her." For He Himself is a wall to us, who surrounds us by guarding us on every side. But the rampart of our wall were all the prophets, who before the Lord appeared in the flesh were sent to build up faith by prophesying. In holy Church, therefore, the Lord is set as a wall to us and His prophets as a rampart, because to us whom He Himself perfectly protects, the words of the prophets also came for the building up of faith. Whence also the wall is rightly placed first, and the rampart afterward, because we who were called from the Gentiles would by no means have received the sayings of His prophets unless we had first come to know the Lord. And it should be noted that this wall of the spiritual building is said to be on the outside. For a wall that is built for the fortification of a building is customarily placed not on the inside but on the outside. What need was there, then, to say "on the outside," since a wall is never customarily placed on the inside? Because it is necessary that being placed on the outside it defend those things which are within. But in this word what is openly demonstrated except the Lord's incarnation itself? For God is a wall to us within, but God made man is a wall to us without. Whence it is said to Him through a certain prophet: "You went forth for the salvation of Your people, to save Your anointed ones." For this incarnate wall, namely the Lord, would not be a wall to us if He had not been on the outside, because He would not protect us within if He did not appear outwardly. But neither should this be carelessly passed over, that this same wall is said to be placed around the house on every side. […]

Next, through the addition of one unit, there is a comparison in relation to the number six. In this sense is understood the measure of the one who carried a rod of six cubits and one palm for the measuring of the temple. Seven, for …

A wall - This was that outmost wall, that compassed the whole mount Sion, upon whose top the temple stood. The man's hand - Christ, hath, and keeps the reed in his own hand, as the only fit person to take the measures of all. A measuring reed - Or cane, for this measuring rod was of those canes growing in that country, long, and light, which architects made use of.