Luke 12: 35 - 40
35 "Let your loins be girded and your lamps burning,
36 and be like men who are waiting for their master to come home from the marriage feast, so that they may open to him at once when he comes and knocks.
37 Blessed are those servants whom the master finds awake when he comes; truly, I say to you, he will gird himself and have them sit at table, and he will come and serve them.
38 If he comes in the second watch, or in the third, and finds them so, blessed are those servants!
39 But know this, that if the householder had known at what hour the thief was coming, he would not have left his house to be broken into.
40 You also must be ready; for the Son of man is coming at an unexpected hour."

EWTN