Irenaeus : These men, therefore, ought to learn [what really is the state of the case], and go back to the true number of the name, that they be not reckoned among false prophets. But, knowing the sure number declared by Scripture, that is, six hundred sixty and six, let them await, in the first place, the division of the kingdom into ten; then, in the next place, when these kings are reigning, and beginning to set their affairs in order, and advance their kingdom, [let them learn] to acknowledge that he who shall come claiming the kingdom for himself, and shall terrify those men of whom we have been speaking, having a name containing the aforesaid number, is truly the abomination of desolation. This, too, the apostle affirms: "When they shall say, Peace and safety, then sudden destruction shall come upon them." And Jeremiah does not merely point out his sudden coming, but he even indicates the tribe from which he shall come, where he says, "We shall hear the voice of his swift horses from Dan; the whole earth shall be moved by the voice of the neighing of his galloping horses: he shall also come and devour the earth, and the fulness thereof, the city also, and they that dwell therein." This, too, is the reason that this tribe is not reckoned in the Apocalypse along with those which are saved. — Against Heresies Book V John Chrysostom : And that thou mayest learn by another thing also, that the silence is not a mark of ignorance on His part, see, together with what we have mentioned, how He sets forth another sign also. "But as in the days of Noe they were eating and drinking, marrying and giving in marriage, until the day that the flood came, and took all away; so shall also the coming of the Son of Man be." And these things He spake, showing that He should come on a sudden, and unexpectedly, and when the more part were living luxuriously. For Paul too saith this, writing on this wise, "When they shall speak of peace and safety, then sudden destruction cometh upon them;" and to show how unexpected, He said, "as travail upon a woman with child." — HOMILIES ON Matthew 77.2 John Chrysostom : "When they are saying peace and safety, then sudden destruction cometh upon them, as travail upon a woman with child; and they shall in nowise escape." Here he has glanced at something which he has also said in his second Epistle. For since they indeed were in affliction, but they that warred on them at ease and in luxury, and then while he comforted them in their present sufferings by this mention of the Resurrection, the others insulted them with arguments taken from their forefathers, and said, When will it happen? But it may be worth while to ask, If Antichrist comes, and Elias comes, how is it "when they say Peace and safety," that then a sudden destruction comes upon them? For these things do not permit the day to come upon them unawares, being signs of its coming. But he does not mean this to be the time of Antichrist, and the whole day, because that will be a sign of the coming of Christ, but Himself will not have a sign, but will come suddenly and unexpectedly. For travail, indeed, you say, does not come upon the pregnant woman unexpectedly: for she knows that after nine months the birth will take place. And yet it is very uncertain. For some bring forth at the seventh month, and others at the ninth. And at any rate the day and the hour is uncertain. With respect to this therefore, Paul speaks thus. And the image is exact. For there are not many sure signs of travail; many indeed have brought forth in the high roads, or when out of their houses and abroad, not foreseeing it. And he has not only glanced here at the uncertainty, but also at the bitterness of the pain. — Homily on 1 Thessalonians 9 Theodoret of Cyrus : The woman who is pregnant knows that she has a fetus in the womb but does not know when birth will occur. So it is with us as we know that the Lord will come, but we do not teach the time itself with certainty. — INTERPRETATION OF THE FIRST LETTER TO THE THESSALONIANS