John Chrysostom
This man, as is evident, was educated and older than Timothy. Therefore, lest they say, “Why did he not send this man to us, but sent a young man instead?” see how the Apostle calms them concerning him.
He calls him brother and tells them that he urged him greatly to go to them. Again, lest they think that he preferred Timothy to him and therefore did not send him, and lest he stir up greater envy in them, he says, “I urged him greatly to go to you with the brethren.”
What then? Did he not agree and not obey, but resist and refuse? Paul does not say this.
But so as not to accuse him and to justify himself, he remarks, “but he was not at all willing to come now, and he will come when he has opportunity.”
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Then, lest they say that this is only an excuse and a pretext, he adds, “he will come when he has opportunity.” Thus he justified Apollos and comforted those who wished to see him with the hope of his arrival.