Mark 13:20

(ubi sup.) The only refuge in such evils is, that God who gives strength to suffer, should abridge the power of inflicting. Wherefore there follows: And except that the Lord had shortened those days.

That is, if the Roman war had not been soon finished, no flesh should be saved; that is, no Jew should have escaped; but for the elect's sake, whom he hath chosen, that is, for the sake of the believing Jews, or who were hereafter to believe, He hath shortened the days, that is, the war was soon finished, for God foresaw that many Jews would believe after the destruction of the city; for which reason He would not suffer the whole race to be utterly destroyed.

(Epist. cxcix. 9.) For Josephus, who has written the history of the Jews, relates that such things were suffered by this people, as are scarcely credible, wherefore it is said, not without cause, that there was not such tribulation from the beginning of the creation until now, nor shall ever be. But although in the time of Antichrist there shall be one similar or greater, we must understand that it is of that people, that it is said that there shall never happen such another. For if they are the first and foremost to receive Antichrist, that same people may rather be said to cause than to suffer tribulation. (ubi sup.) But some persons more fitly understand that the calamities themselves are signified by days, as evil days are spoken of in other parts of holy Scripture; for the days themselves are not evil, but what is done in them. The woes themselves therefore are said to be abridged, because through the patience which God gave they felt them less, and then what was great in itself was abridged.

But the tribulation shall be great, and the days short, for the sake of the elect, lest the evil of this time should change their understanding.