Luke 17:26 And as it was in the days of Noe, so shall it be also in the days of the Son of man.
Luke 17:27 They did eat, they drank, they married wives, they were given in marriage, until the day that Noe entered into the ark, and the flood came, and destroyed them all.
Jesus is as our Ark, we shall abide safely in him. John 3:36 He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him.
Luke 17:28 Likewise also as it was in the days of Lot; they did eat, they drank, they bought, they sold, they planted, they builded;
Luke 17:29 But the same day that Lot went out of Sodom it rained fire and brimstone from heaven, and destroyed them all.
Lot was taken out of Sodom by the angels. The angels shall gather God's people and those not in Jesus shall be destroyed.
Mat 13:30 Let both grow together until the harvest: and in the time of harvest I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them: but gather the wheat into my barn.
We will know that the time is near, but the world will be taken by surprise.
Luke 17:30 Even thus shall it be in the day when the Son of man is revealed.