Matthew 24:27 - Ellicott's Commentary On The Whole Bible

As the lightning cometh out of the east. — In this and the three preceding verses we are, as it were, on the dim border-land of the primary and the ultimate fulfilments of the words. The disciples in their questions (Matthew 24:3) had connected the destruction of Jerusalem with the “coming” of their Lord, and the two are connected even in His own words and thoughts. In whatever way He came, whether in the final destruction of the Temple and polity of Israel, or at the end of the world’s great drama, the advent would be sudden and unlooked-for as the lightning-flash. The crises of the world’s history, which are the “springing and germinant accomplishments” of such words as these, are always unexpected by the great mass of mankind, even though the few whose eyes are opened can discern the signs of the times, and know that their “redemption draweth nigh.”