Mark 13:19

(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.

(ubi sup.) Or else; these words, In those days shall be affliction, properly agree with the times of Antichrist, when not only tortures more frequent, and more painful than before are to be heaped on the faithful, but also, what is more terrible, the working of miracles shall accompany those who inflict torments. But in proportion as this tribulation shall be greater than those which preceded, by so much shall it be shorter. For it is believed, that during three years and a half, as far as may be conjectured from the prophecy of Daniel and the Revelations of John, the Church is to be attacked.

And He fitly gives the cause for so great a necessity for flight; saying, For in those days shall be affliction, such as was not from the beginning of the creation which God created unto this time, neither shall be.

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.