Take ye heed, watch and pray: for ye know not when the time is.
For the Son of Man is as a man taking a far journey, who left his house, and gave authority to his servants, and to every man his work, and commanded the porter to watch.
Watch ye therefore: for ye know not when the master of the house cometh, at even, or at midnight, or at the cockcrowing, or in the morning:
Lest coming suddenly he find you sleeping.
And what I say unto you I say unto all, Watch.
Mark 13:33-37
