Matthew 24:43

The master of the household is the understanding, the house is the soul, the thief is the Devil. The thief is also every contrary doctrine which enters the soul of the unwary by other than the natural entrance, breaking into the house, and pulling down the soul's natural fences, that is, the natural powers of understanding, it enters the breach, and spoils the soul. Sometimes one takes the thief in the act of breaking in, and seizing him, stabs him with a word, and slays him. And the thief comes not in the day-time, when the soul of the thoughtful man is illuminated with the Sun of righteousness, but in the night, that is, in the time of prevailing wickedness; in which, when one is plunged, it is possible, though he have not the power of the sun, that he may be illuminated by some rays from the Word, as from a lamp; continuing still in evil, yet having a better purpose, and watchfulness, that this his purpose should not be broken through. Or in time of temptation, or of any calamities, is the time when the thief is most found to come, seeking to break through the house of the soul.

In this He rebukes such as have less care for their souls, than they have of guarding their money against an expected thief.

And by the instance of the master of the household, He teaches more plainly why He keeps secret the day of the consummation.

(Hom. in Ev. xiii. 5.) Or, the thief breaks into the house through the neglect of the master of the house, when the spirit has slept upon its post of guard, and death has come in unawares into the dwelling house of our flesh, and finding the lord of the house sleeping, slays him; that is, the spirit, little providing for coming evils, is taken off unprepared, to punishment, by death. But if he had watched he would have been secure from the thief; that is, looking forward to the coming of the Judge, who takes our lives unawares, he would meet Him with penitence, and not perish impenitent.

After this again, that they may not ask about it, He added, "Watch therefore, for ye know not what hour your Lord doth come." He said not, "I know not," but, "ye know not." For when He had brought them well nigh to the very hour, and had placed them there, again He deters them from the inquiry, from a desire that they should be striving always. Therefore He saith, "Watch," showing that for the sake of this, He did not tell it. "But know this, that if the good man of the house had known in what watch the thief would come, he would have watched, and would not have suffered his house to be broken up. Therefore be ye also ready, for in such an hour as ye think not the Son of Man cometh." For this intent He tells them not, in order that they may watch, that they may be always ready; therefore He saith, When ye look not for it, then He will come, desiring that they should be anxiously waiting, and continually in virtuous action. But His meaning is like this: if the common sort of men knew when they were to die, they would surely strive earnestly at that hour. In order therefore that they may strive, not at that hour only, therefore He tells them not either the common hour, or the hour of each, desiring them to be ever looking for this, that they may be always striving. Wherefore He made the end of each man's life also uncertain. After this, He openly calls Himself Lord, having nowhere spoken so distinctly. But here He seems to me also to put to shame the careless, that not even as much care as they that expect a thief have taken for their money, not even this much do these take for their own soul. For they indeed, when they expect it, watch, and suffer none of the things in their house to be carried off; but ye, although knowing that He will come, and come assuredly, continue not watching, saith He, and ready so as not to be carried away hence unprepared. So that the day cometh unto destruction for them that sleep. For as that man, if he had known, would have escaped, so also ye, if ye be ready, escape free.