Matthew 25:6

There was a cry. So shall we all have to rise again at the sound of the last trumpet, to meet our judge, either like the wise virgins, who having their oil ready, and their lamps trimmed and burning, soon prepare themselves to give in their accounts to their Lord; or, like the foolish, who having made no provision of the oil of good works, are compelled to seek it at the time they are to be judged. (St. Augustine) --- It is said he will come at midnight; i.e. when least expected.