As the days of Noe were. In citing this example, the Lord has special reference to the fact that the warning then given was not heeded (Genesis 6:3). If, as seems probable, the antediluvians had more than a century's warning of the coming flood, it can hardly be only the suddenness of the calamity to which Christ would point (1 Peter 3:20).
He has used the illustration elsewhere (Luke 17:26, Luke 17:27), where also the destruction of Sodom is adduced as a type of the last day. So shall also The parousia of Christ shall fall on a world incredulous and heedless.