Heaven and earth shall pass away,.... Which may be understood either affirmatively, as what will be at the second coming of Christ; or comparatively, rather than any thing said by Christ should; and so shows the certainty and irreversibleness of his predictions, as it follows:

but my words shall not pass away; which is true of all the words of Christ he ever spake, and here particularly relates to those he had just delivered, concerning the calamities that should come upon the Jewish nation; See Gill on Matthew 24:35.

Heaven and earth shall pass away: but my words shall not pass away.

31. Heaven and earth shall pass away; but my words shall not pass away-the strongest possible expression of the divine authority by which He spake; not as Moses or Paul might have said of their own inspiration, for such language would be unsuitable in any merely human mouth.

Warnings to Prepare for the Coming of Christ Suggested by the Foregoing Prophecy (Mr 13:32-37).

It will be observed that, in the foregoing prophecy, as our Lord approaches the crisis of the day of vengeance on Jerusalem and redemption for the Church-at which stage the analogy between that and the day of final vengeance and redemption waxes more striking-His language rises and swells beyond all temporal and partial vengeance, beyond all earthly deliverances and enlargements, and ushers us resistlessly into the scenes of the final day. Accordingly, in these six concluding verses it is manifest that preparation for "THAT DAY" is what our Lord designs to inculcate.

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.