Having told them what the sign would be, and counselled His disciples to lose no time in making their escape as soon as they should see it, He further warns them, in a few impressive words, of the terrors of those days of tribulation (vv. 19-22), and then concludes this portion of the prophecy by warning them against the supposition--a very natural one in the circumstances--that even then the Son of man should come.
So far we have found the leading ideas to be simple and practical, and all connected with the destruction of Jerusalem. (1) Do not expect that event too early; for you must pass through many trials and do much work before it. (2) As soon as you shall see the sign I give you, expect it immediately, and lose no time in making your escape from the horrors of these awful days. (3) Even then, however, do not expect the personal advent of the Son of man; for though it is a day of judgment, it is only one of those partial judgments which are necessary on the principle that "wheresoever the carcase is, there will the eagles be gathered together." The personal advent of Christ and the day of final judgment are only foreshadowed by, not realised in, the destruction of Jerusalem and the close of the old dispensation.
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The three closing verses of this portion of the prophecy refer pre-eminently to the great Day of the coming of the Son of man (vv. 29-31). The word "immediately" has given rise to much difficulty, on account of the hasty conclusion to which some have come that "immediately after the tribulation of those days" must mean immediately after the destruction of Jerusalem; according to which all this must have taken place long ago. It is, indeed, sufficiently obvious that the tribulation of those days began with the destruction, or rather with the besieging, of Jerusalem. But when did it end? As soon as the city was destroyed? Nay. If we wish to get some idea of the duration of those days of tribulation, let us turn to the same place in the same prophecy as given by St. Luke (xxi. 23, 24), where it clearly appears that it embraces the whole period of the Jewish dispersion and of the standing of the Gentile Church. "The tribulation of those days" is going on still, and therefore the events of these verses are still future. We look forward to the Day of the Lord of which that terrible day of judgment, to which their thoughts were first turned, was only a dim foreshadowing--a Day far more august in its nature, far more awful in its accompaniments, far more terrible in its aspect to those who are unprepared for it, yet full of glory and of joy to those who "love His appearing."
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Appended to the main prophecy are some additional warnings as to time (vv. 32-44) setting forth in the most impressive manner the certainty, the suddenness, and, to those who are not looking for it, the unexpectedness of the coming of the Day of the Lord. Here again, in the first portion the destruction of Jerusalem, and in the latter portion the Day of the Son of man, is prominent. If we bear this in mind it will remove a difficulty many have found in ver. 34, which seems to say that the events specially referred to in vv. 29-31 would be fulfilled before that generation passed away. But when we remember that the prophecy proper closes with the thirty-first verse, and that the warning as to the imminency of the events referred to commences with ver. 32, the difficulty vanishes; for it is most natural that the practical warning should follow the course of the prophecy itself, referring first to the destruction of Jerusalem, and passing from it to that grand event of which it was the precursor. On this principle vv. 32-35 are quite simple and natural, as well as most impressive, and the statement of ver. 34 is seen to be literally accurate.