John Chrysostom

"For I know this, that after my departing shall grievous wolves enter in among you, not sparing the flock." Again he engages them from another quarter, from the things which should come after: as when he says, "We wrestle not against flesh and blood. After my departing," he says, "grievous wolves shall enter in among you" (Eph. vi. 12); twofold the evil, both that he himself would not be present, and that others would assail them. "Then why depart, if thou knowest this beforehand?" The Spirit draws me, he says. …

Homily on Acts 44 ↗

Theophylact of Ohrid

A twofold misfortune: on the one hand, that he will not be there, and on the other, that certain people will attack, and moreover — what is especially bitter — "from among your own selves." It is grievous when civil war breaks out.

Commentary on Acts ↗

Cyprian

These several matters, I pray you, suggest to our brethren. And as "he who humbleth himself shall be exalted," now is the time when they should rather fear the ensnaring adversary, who more eagerly attacks the man that is strongest, and becoming more virulent, for the very reason that he is conquered, strives to overcome his conqueror. The Lord grant that I may soon both see them again, and by salutary exhortation may establish their minds to preserve their glory. …

Epistle V ↗