John Chrysostom
“Greet Apelles, approved in Christ.” Nothing equals this praise, to be blameless and not even give occasion for reproach in matters according to God.
When the Apostle says, “approved in Christ,” he means every virtue.
Why does the Apostle not use such expressions in his greetings as, “my master so-and-so,” or, “my lord”? Because that praise is weightier than this.
In the latter, only honor is expressed. In apostolic praise, virtue is indicated.
The Apostle did not accidentally honor them with the same praise, greeting many who were lower together with those who were higher and noble.
By greeting them, and greeting them together with others in the same epistle, the Apostle gave equal honor to all.
By praising each in particular, he set before us the special virtue of each.
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He does this so as not to produce envy by honoring some and not honoring others. He also does it so as not to mix the unworthy with the worthy.
Nor did he wish to lead them into negligence by granting the same honor to all who were not equally worthy.
“Greet the faithful of the household of Aristobulus.” See Rom 16:11.