All the brethren greet you through me, that is, all the Christians surrounding the Apostle. From the very beginning Christians loved to call themselves brethren, faithful, saints, and similar names.
What does a greeting mean, or, as people say, a bow? Among us they say, "Bow to such and such a person." But according to sacred expression one should write, "greet." What does this mean?
A greeting or bow sent through another person or in a letter expresses kind remembrance of the one greeted, sympathy for him, unity of spirit, and in general a whole series of good wishes. Therefore the greeting from the Churches of Asia to the Church of Corinth teaches the Corinthians to value unity of mind with other Churches and the love of the latter for it.
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Therefore, the Apostle continues to the Corinthians, greet one another with a kiss, but a holy one. Do not kiss your neighbor as Judas did. Express your greeting not merely from propriety, nor only in words or bodily movements, that is, gestures.
Rather, prove by deed your respect for one another and your Christian, holy love, not merely a kiss of the lips. Put an end to empty quarrels and divisions. Love one another as before, so that with one mind you may confess the one Redeemer, Christ, without preferring one apostle over another.