It will be like what happened when Noah lived. Until the flood came, the people did not know that anything bad would happen to them. Before the flood waters covered the earth, the people were eating and drinking as usual. Some men were marrying women and some parents were giving their daughters to men to marry them. They were doing all this until the day that Noah and his family entered the big boat. And then the flood came and drowned all those who were not in the boat. Similarly, the unbelieving people will not know when I, the one who came from heaven, will return, and they will not be expecting me.