Victorinus of Poetovio
The seven churches are named by the Apostle with their own names, and to them he sends the epistles. Yet this is not because only they are churches, or because they are first among the rest. Rather, what he says to one, he says to all.
It makes no difference whether one speaks to a small detachment of soldiers, or through it to the whole army. Finally, whether in Asia or in the whole world, Paul teaches that all seven churches, the seven named, are one catholic Church.
First, in order to preserve this, he did not exceed the number of seven churches. He wrote to the Romans, Corinthians, Ephesians, Thessalonians, Galatians, Philippians, and Colossians. Then Paul wrote to individuals, so that he would not surpass the number of seven churches.
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Soon, bringing his proclamation to completion, he says to Timothy: “that you may know how one ought to conduct himself in the house of God, which is the Church of the living God” (1 Tim 3:15).
We read that a similar form of expression is used in Isaiah, where seven women are foretold as taking hold of one man. The one man is Christ, born not of seed.
The seven women are the churches, eating their own bread and clothed in their own garments. They desire to have their reproach taken away, so that they may be called by His name.
The bread is the Holy Spirit, nourishing unto eternal life. Their own bread means what was promised to them through faith. So too their own garment means the garment promised to them, with which they desire to be covered.
Finally, Paul says: “this corruptible must put on incorruption, and this mortal must put on immortality” (1 Cor 15:53).
“Take away our reproach.” The reproach is former sin, which is taken away in baptism. The one baptized begins to be called a Christian, which is what it means to say: “let us be called by your name.”
Therefore understand that among them the seven churches arise from the one Church.
That John and Paul, when speaking of the seven churches, spoke of the one catholic Church is an idea common to Apringius, Primasius, Bede, and others.
Isa 4:1 says: “And seven women shall take hold of one man in that day, saying, ‘We will eat our own bread and wear our own clothing; only let us be called by your name. Take away our reproach.’”