1 Thess 5:2-3
2 You know as well as I that the day of the Master's coming can't be posted on our calendars. He won't call ahead and make an appointment any more than a burglar would. 3 About the time everybody's walking around complacently, congratulating each other — "We've sure got it made! Now we can take it easy!" — suddenly everything will fall apart. It's going to come as suddenly and inescapably as birth pangs to a pregnant woman.