John Chrysostom
"To the Church of God." Not of this one or that one, but "of God." "Which is in Corinth." Do you see how by every expression he casts down their arrogance, raising their mind in every way to heaven?
He calls the Church God’s, thereby showing that there must be unity in it. For if it is God’s, it is united and one, not only in Corinth, but also throughout the whole inhabited world.
The name of the Church is a name not of division, but of unity and concord.
"To those sanctified in Christ Jesus." Again he brings in the name of Jesus, not the names of men. What is sanctification? Washing, cleansing.
He reminds them of the uncleanness from which He delivered them, and teaches humility. For they were sanctified not because of their own good works, but by God’s love for mankind.
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"Called saints." Even the fact that you are saved by faith is not from yourselves, he says. You did not come first, but were called, so that even this small thing does not fully belong to you.
Although you came while burdened with many evils, even for this you are indebted not to yourselves, but to God. Therefore in the Epistle to the Ephesians he says, "By grace you have been saved through faith, and this is not from yourselves" (Eph 2:8).
Even faith does not fully belong to you. You did not believe on your own, anticipating God, but obeyed when you were called.
"With all who call upon the name of our Lord Jesus Christ." The name not of this or that person, but of the Lord. "In every place, theirs and ours."
Although the Epistle was written only to the Corinthians, he mentions all believers throughout the whole inhabited world. He shows that the Church must be one everywhere, though it is in different places, and all the more in Corinth.
Place divides, but the Lord unites them, since He is common to all. Therefore, in order to instill unity in them, he added, "ours and theirs." The latter is more important than the former.
Those who are in one place, when they have many masters who disagree among themselves, are divided. Place does not help them toward unity, because their masters give them different commands and each demands his own.
It is said, "You cannot serve God and mammon" (Mt 6:24). So too, those who are in different places, when they have not different masters but only one, do not lose concord because of places, for the one Lord unites them.
Therefore, he says, you Corinthians must be in concord not only with the Corinthians, but with all throughout the inhabited world, since you have a common Master. Therefore he added "ours" a second time.
Lest any foolish person think that he admits division when he said, "the name of our Lord Jesus Christ," he again adds, "our Lord and theirs."
To make this clearer, I will read it as the sense of the speech requires: Paul and Sosthenes to the Church of God which is in Corinth. And to all who call upon the name of our Lord and theirs in every place, whether in Rome or wherever they may be, grace to you and peace from God our Father and the Lord Jesus Christ.
Or it may be read this way, and I think it is still more exact: Paul and Sosthenes to those in Corinth who are sanctified, called saints, with all who call upon the name of our Lord Jesus Christ in every place, both theirs and ours.
That is, grace to you and peace to you who are in Corinth, sanctified and made called ones, not to you alone, but together with all in every place who call upon the name of Jesus Christ, our Lord and theirs.