Now therefore you are no more strangers and sojourners, but fellow citizens with the saints, and of the household of God;
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Believers become “fellow citizens” in a way analogous to all those who desired the peace of Rome. They brought gifts and were accepted as Roman citizens, as were the people of Cilician Tarsus. Paul was a Roman citizen of that city. So too anyone who has joined himself to the Christian faith becomes a fellow citizen of the saints and a member of God’s household.
What are we to understand by “fellow citizens with the saints?” It implies a distinction between citizens and saints. But if this is so, who are the saints and who are the citizens? Saints refers to the apostles, prophets and all who formerly experienced God or spoke divinely through the Spirit dwelling within them. They in some way beheld God’s presence, as did Abraham, either through the flesh, through the Spirit or through both flesh and Spirit, as with all the apostles. Those who have later believed in Christ without any such special means are “fellow citizens with the saints and members of God’s household.” .
You are no longer strangers with regard to God and his holy alliance. You are no longer travellers and vagabonds, without a God, as you were before your conversion; not knowing to whom you belonged, nor finding in paganism either solid foundation or truth, neither hopes for this nor consolation for future life. But now you are become citizens of the same city as the saints, and domestics of the house of God. (Calmet)
* And of the household, he continues, of God.
The very thing which they at the first had, by means of so many toils and troubles, has been for you accomplished by the grace of God. Behold the hope of your calling.