Thematic Bible: (unexpectedness of,) of suddenness of Christ's coming

Now no one knows anything about that day or hour, not even the angels in heaven, but only my Father. As were the days of Noah, so will the arrival of the Son of man be. For as in the days before the deluge people ate and drank, married and were married, till the day Noah entered the ark; read more.
and as they knew nothing till the deluge came and swept them all away; so will the arrival of the Son of man be.

And just as it was in the days of Noah, so will it be in the days of the Son of man; they were eating, drinking, marrying and being married, till the day Noah entered the ark ??then came the deluge and destroyed them all. Or just as it was in the days of Lot; they were eating, drinking, buying, selling, planting and building, read more.
but on the day that Lot left Sodom it rained fire and brimstone from heaven and destroyed them all. So will it be on the day the Son of man is revealed.