Matthew 24:43

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. […]

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

(Verse 42, 43.) Therefore, stay awake, for you do not know at what hour your Lord is coming. But understand this, that if the master of the house had known at what hour the thief was coming, he would have stayed awake and would not have let his house be broken into.

He bids us to keep vigil and to be ready, that is, to have stored up beforehand deeds of virtue so that when the Lord comes asking for the things that He wants, we will have them to give. See how He did not say, …

But to shake off the sloth of our mind, even external losses are brought forward through a comparison, so that through these the soul may be roused to guard itself. For it is said: "Know this, that if the master of the house knew at what hour the thief was coming, he would certainly watch and would not allow his house to be broken into." For while the master of the house is unaware, the thief breaks into the house, because while the spirit sleeps from guarding itself, unforeseen death coming bursts into the dwelling of our flesh, and slays as if sleeping the one it found as master of the house, because when the spirit fails to foresee the coming losses, death snatches him unknowing to punishment. But he would resist the thief if he were watching, because being on guard against the coming of the judge who secretly seizes the soul, he would meet him by repenting, lest he perish impenitent.

(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.

But know this, that if the master of the house knew at what hour the thief would come, he would watch at that hour and would not suffer his house to be broken open. But because he does not know at what hour, he must …

But know this,....

There are verses in this passage which are often much misapplied. “The coming of the Son of Man” is frequently spoken of as being the same thing as death; the texts which describe the uncertainty of his coming are used in epitaphs, and thought suitable to the tomb. But there is no solid ground for such an application of this passage. Death is one thing, and the coming of the Son of Man is quite another. The subject of these verses is not death, but the second advent of Jesus Christ. Let us remember this.

There are verses in this passage which are often much misapplied. “The coming of the Son of Man” is frequently spoken of as being the same thing as death; the texts which describe the uncertainty of his coming are used in epitaphs, and thought suitable to the tomb. But there is no solid ground for such an application of this passage. Death is one thing, and the coming of the Son of Man is quite another. The subject of these verses is not death, but the second advent of Jesus Christ. Let us remember this. It is a serious thing to wrest Scripture and use it in any but its true meaning. The first thing that demands our attention in these verses is the awful account that they give of the state of the world when the Lord Jesus comes again. The world will not be converted when Christ returns: it will be found in the same condition that it was in the day of the flood. When the flood came, men were found “eating and drinking, marrying and giving in marriage” absorbed in their worldly pursuits and utterly regardless of Noah’s repeated warnings. They saw no likelihood of a flood; they would not believe there was any danger. But at last the flood came suddenly and took them all away. All that were not with Noah in the ark were drowned: they were all swept away to their last account, unpardoned, unconverted and unprepared to meet God. And our Lord says, “ So shall also the coming of the Son of Man be.” Let us mark this text, and store it up in our minds. There are many strange opinions current on this subject, even among good men. Let us not flatter ourselves that the heathen will all be converted and the earth filled with the knowledge of God before the Lord comes; let us not dream that the end of all things cannot be at hand because there is yet much wickedness both in the church and in the world.

If the good man of the house had known - “As a master of a family who expected a thief at any time of the night, would take care to be awake, and ready to protect his house; so do ye, who know that the Son of man will come. Though the day and hour be uncertain, continue always in a state of watchfulness, that he may not come upon you unawares.” Wakefield.