Therefore keep watch, because you do not know the day on which your Lord will come.
42. Watch therefore. In Luke the exhortation is more pointed, or, at least, more special, Take heed to yourselves, lest at any time your hearts be overcharged with surfeiting, and drunkenness, and the cares of this life. And certainly he who, by living in intemperance, has his senses overloaded with food and wine, will never elevate his mind to meditation on the heavenly life.
But know this,.... Or you do know this: this may be illustrated by supposing a case well known to men, and in which common prudence would direct a man how to behave: that if the good man of the house, or householder, or master of the family, had known in what watch the thief would come; whether at the first, second, third, or fourth watch...
Verse 42. Watch. Be looking for his coming. Be expecting it as near; as a great event; as coming in an unexpected manner. Watch the signs of his coming, and be ready. (m) "therefore"