Theophylact of Ohrid, on 1Thess 3:3

“That no man should be moved in these tribulations: for yourselves know, that we are appointed thereunto.”

“The Apostle indicates here what benefit the confirmation from the person of holy Timothy was meant to bring them. This, he says, is so that they would not be shaken, that is, not lose heart and not grow weak in view of my trials. For the devil, when he finds a favorable time for temptation, unsettles the unsteady by reminding them of their former ease, so that they would fall away from that which was the cause of their afflictions. Some, however, have said that σαίνεθαι, "to be shaken, to be disturbed," is used in place of ταράττεσθαι, "to be agitated" — a metaphor taken from dogs which, when they fawn, wag their tails.”

Imported from an open dataset — not yet checked against the printed edition.