Matthew 24:42-44

Watch therefore [give strict attention, be cautious and active], for you do not know in what kind of a day [whether a near or remote one] your Lord is coming. But understand this: had the householder known in what [part of the night, whether in a night or a morning] watch the thief was coming, he would have watched and would not have allowed his house to be undermined and broken into. You also must be ready therefore, for the Son of Man is coming at an hour when you do not expect Him.