Therefore, be continually on the alert—for you do not know when the master of the house is coming, whether in the evening, or at midnight, or when the rooster crows, or in the morning— [stay alert,] in case he should come suddenly and unexpectedly and find you asleep and unprepared. What I say to you I say to everyone, ‘Be on the alert [stay awake and be continually cautious]!’ ”