Matthew 24:42-44

Twentieth_Century(i) 42 Therefore watch; for you cannot be sure on what day your Master is coming. 43 But this you do know, that, had the owner of the house known at what time of night the thief was coming, he would have been on the watch, and would not have allowed his house to be broken into. 44 Therefore, do you also prepare, since it is just when you are least expecting him that the Son of Man will come.