The Deluge: (Unexpectedness of) Suddenness of Christ's Coming
Source: TTT
Matthew 24:36–39
No one knows about that day or hour, not even the angels in heaven, nor the Son, but only the Father. / As it was in the days of Noah, so will it be at the coming of the Son of Man. / For in the days before the flood, people were eating and drinking, marrying and giving in marriage, up to the day Noah entered the ark.
Luke 17:26, 27–30
Just as it was in the days of Noah, so also will it be in the days of the Son of Man: / People were eating and drinking, marrying and being given in marriage, up to the day Noah entered the ark. Then the flood came and destroyed them all. / It will be just like that on the day the Son of Man is revealed.