The catholic Church is being built, and they are being built together with her. They are united with her deeply and essentially, so that they cannot be built separately and in isolation. Local Churches live by the common life of the whole Church.
So in the body each function seems to act by itself, such as breathing, circulation, or nourishment. In fact, it acts because it is connected with the whole body. Once separated from it, it immediately ceases, just as every outer member dies when cut from the body, or every branch when cut from the tree.
In other places the Apostle says that each believer is also a temple of God and a dwelling of God. Here he does not say this directly, but one may arrive at it by inference while reading this passage. Saint Chrysostom does so when he says: "This temple, in which God dwells as in a body, is each one of you and all of you together."
Each member of the body contains everything that is in the body. In it are blood, muscle, nerve, and other fluids. It is a condensed form of the whole body. In a tree this is still clearer. Each branch is the same as the whole tree, with root, trunk, and leaves. Each leaf is the same as the whole branch.
So each believer has everything that is in the Church: the truth of the word, the grace of the mysteries, and communion with God in Christ Jesus. He is a condensed Church. Yet he is such because he is united with the whole Church.
The powers and life of the Church enter into him, and he lives by the life of the Church. Separateness is entirely contrary to the spirit of Christianity. This building into a temple and dwelling for God, whether of each believer, of local Churches, or of the whole Church, is accomplished by the Holy Spirit.
Both every person and whole peoples are unfit in themselves to be God’s dwelling. The grace of the Spirit enters the soul through faith and through the mysteries. It transforms the soul, spiritualizes it, and makes it fit for God to dwell in it.
If God is in each believer by grace, then by that same grace He is also in the souls of the whole community of believers. Thus He is in all believers, that is, in the whole Church. He says that you are a dwelling for God in the Lord Jesus Christ, by the Spirit.
All the persons of the Most Holy Trinity are in you, the undivided Godhead Himself. To what nearness the Apostle has brought them. From afar, through citizenship and kinship, he has led them here. God is in them, and they in turn are in God, for He embraces all things.
There is nowhere further to go in order to indicate greater nearness. It was fitting for the Apostle at the beginning to cry out: remember, Ephesians, how far away you were and how near you have become.
Let us also take several lessons for ourselves from this. Everything is said here about the Church of God that the Symbol of Faith teaches us to believe. She is one, being established upon the one cornerstone (verses 14, 16, 17, 20).
She is holy, because she is built by the Holy Spirit into a holy temple (verses 21, 22). She is catholic, because she embraces all times and peoples (verses 14, 20). She is apostolic, being built upon the foundation of the Apostles (verse 20).
The holy Church is the city of God, the house of God, a living temple, and the living dwelling of the living God. The image most understandable to us is that of temple and dwelling. The cornerstone of the building is the Lord Jesus Christ, the Son of God.
The Church stands firm, and the gates of Hades shall not prevail against her. Upon the cornerstone, the Apostles and prophets are laid first, and upon them the whole building is then raised. From them comes the word of truth.
From them also comes the grace of the Spirit, given through the mysteries established by them and kindled through all the other ranks and orders of the Church. Nothing here may be touched with the intention of changing or abolishing it. Otherwise you will destroy the Church.
Both apostolic teaching and apostolic institutions are inviolable. The body of the building is made up of all believers, of every sex, age, and condition. They are worked like stones and made fit for laying into the building by the Holy Spirit.
Love poured forth from Him joins them all together like cement and, as it were, fuses them into one. "For what purpose is such a building raised? So that God Himself may dwell in it as in a temple" (Saint Chrysostom).
This temple is holy, majestic, and worthy of reverence. If such is the temple, what ought every believer to be who forms part of it?
Blessed Jerome writes: "If every building, fitly joined together, grows into a holy church in the Lord, then we must spare no labor. We must strive to become those stones of which it is said: ‘Holy stones lie scattered,’ that is, are found in abundance, ‘on His land’ (Zech 9:16).
When we become living stones, hewn, cleansed, and polished on every side, then we shall be built into a temple and shall be a dwelling for God. The ark of the covenant will be established in us, the guardian of God’s law.
There will also be the Cherubim, the abundance of knowledge. The inward part of our breast will pass into a new word, for what is in the heart will be expressed by a new word. We shall be called dabir, which means oracle, or answer, or, more exactly, a place of speaking.
Thus we shall be able to say with the Apostle: ‘Do you seek proof of Christ speaking in me?’ (2 Cor 13:3)."