(33) Take ye heed.--Note once more the characteristic iteration of the warning. It would almost seem, from the very different conclusions of the discourse in the three Gospels, as if they had been based up to this point on a common document which then stopped and left them to a greater divergency of memory or tradition. The omission of St. Matthew's reference to the history of Noah is, perhaps, characteristic of St. Mark's as a Gentile Gospel.

Verses 33-37. - These exhortations, which gather up in a succinct form the practical bearing of the parallel passages and parables in St. Matthew, must not be understood as implying that our Lord's coming in judgment would be during the lifetime of his disciples. The preceding words would teach them plainly enough that the actual time of this coming was hidden from the. m. But the intention was that, while by the certainty of the event their faith and hope would be quickened, by the uncertainty of the time they might be left in a continual state of watchfulness and prayer. According to the Jewish reckoning, there were only three watches - namely, the first watch, from sunset to 10 p.m.; the second watch, from 10 p.m. to 2 a.m.; and the third watch, from 2 a.m. to sunrise. But after the establishment of the Roman power in Judaea, these watches were divided into four; and were either described as the first, second, third, and fourth respectively; or, as here, by the terms even, beginning at six and ending at nine; midnight, ending at twelve; cockcrowing, ending at three; and morning, ending at six.

13:28-37 We have the application of this prophetic sermon. As to the destruction of Jerusalem, expect it to come very shortly. As to the end of the world, do not inquire when it will come, for of that day and that hour knoweth no man. Christ, as God, could not be ignorant of anything; but the Divine wisdom which dwelt in our Saviour, communicated itself to his human soul according to the Divine pleasure. As to both, our duty is to watch and pray. Our Lord Jesus, when he ascended on high, left something for all his servants to do. We ought to be always upon our watch, in expectation of his return. This applies to Christ's coming to us at our death, as well as to the general judgment. We know not whether our Master will come in the days of youth, or middle age, or old age; but, as soon as we are born, we begin to die, and therefore we must expect death. Our great care must be, that, whenever our Lord comes, he may not find us secure, indulging in ease and sloth, mindless of our work and duty. He says to all, Watch, that you may be found in peace, without spot, and blameless.Take ye heed, watch and pray,.... This seems to be the principal reason why the day and hour of Jerusalem's destruction, though known by the Father, were not made known to any man, neither to the angels, nor by them; nor to the son of man in the days of his flesh, nor by him when on earth; that his people might be upon their guard, against false Christs, and prophets, and their deception; and watch unto prayer, and in it, lest they fell into temptation, and that day should come upon them unawares:

for ye know not when the time is; the exact and precise time: for though the people of God had notice of it, and were sensible it was at hand, and did make their escape out of Jerusalem; yet they knew not the exact time, but that it might be sooner or later; and the unbelieving Jews were blinded, and in the dark about it to the very last; See Gill on Matthew 24:42.