John Chrysostom
Here the Apostle pointed to what he also said in the second epistle. Since the Thessalonians were in affliction, while their enemies were in rest and pleasure, he comforted them in their present sufferings by speaking of the resurrection.
Their enemies insulted them, spread the opinions of their fathers, and said: when will this be? Therefore, just as the prophets said, "Woe to those who say, 'Let Him make haste and speed His work, that we may see it.
Let the counsel of the Holy One of Israel draw near and come to pass, that we may know it!'" (Is 5:19). Or again, "Woe to those who desire the day of the Lord!"
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By this they meant not simply those who desire it, but those who desire it through unbelief. And again, "The day of the Lord," says the prophet, "is darkness, and not light" (Amos 5:18).
So the Apostle also spoke here. And see how he comforts them. It is as though he says: let them not conclude from their prosperity that there will be no judgment.
It will overtake them in just that way. Yet one circumstance deserves attention. If the antichrist will come, and if Elijah will come, how will utter destruction suddenly fall upon them when they say, "Peace and security"?
These events, as signs of Christ's coming, would not allow that day to be unknown. But the Apostle does not indicate that time, that is, the time of the antichrist.
Nor does he say that the day of his coming will be a sign of Christ's coming. Rather, he affirms that Christ will give no advance sign of Himself, but will come suddenly and unexpectedly.
So too, he says, the time of birth does not come entirely unanticipated for a pregnant woman. She knows that birth will come after nine months.
Yet this time is very unknown to her. Some have given birth after seven months, others after nine. In any case the day and hour of childbirth are unknown.
This, then, is why Paul speaks of this. And the comparison is accurate. In truth, there are few signs of the time of birth.
Because of this many, not foreseeing it, have given birth on the roads and away from home. But in this comparison the Apostle wished to indicate not only the uncertainty of the time.
He also wished to indicate the severity of the suffering. As a woman giving birth, while playing, laughing, and foreseeing absolutely nothing, is suddenly seized by inexpressible pains and torn by the pangs of childbirth, so also will souls be struck when that day comes.
"And they shall not escape." He shows that he is not saying this about them, the Thessalonian Christians.