Matthew 24:42

Watch therefore: for ye know not on what day your Lord cometh. But know this, that if the master of the house had known in what watch the thief was coming, he would have watched, and would not have suffered his house to be broken through. Therefore be ye also ready; for in an hour that ye think not the Son of man cometh.

The most urgent conclusion from the preceding discourse was presented in a single word by Jesus, "watch"! Since it is impossible to know the day or the hour, the true disciples must be ready ALWAYS. The second coming will occur at a time when men do not expect it, and that should set at rest the speculations of those who have thought to discover it. The constant watchfulness of a householder against a thief is made a parable of the watchfulness of the Lord's followers against the day of judgment. Christ refers to himself in Matthew 24:42 as "your Lord," another incidental witness to his godhead.