Matthew 24:42

Watch for your life's sake. Let not your lamps be quenched, nor your loins unloosed; but be ye ready, for ye know not the hour in which our Lord cometh. But often shall ye come together, seeking the things which are befitting to your souls: for the whole time of your faith will not profit you, if ye be not made perfect in the last time. For in the last days false prophets and corrupters shall be multiplied, and the sheep shall be turned into wolves, and love shall be turned into hate; for when lawlessness increaseth, they shall hate and persecute and betray one another, and then shall appear the world-deceiver as Son of God, and shall do signs and wonders, and the earth shall be delivered into his hands, and he shall do iniquitous things which have never yet come to pass since the beginning. Then shall the creation of men come into the fire of trial, and many shall be made to stumble and shall perish; but they that endure in their faith shall be saved from under the curse itself. And then shall appear the signs of the truth; first, the sign of an out-spreading in heaven; then the sign of the sound of the trumpet; and the third, the resurrection of the dead; yet not of all, but as it is said: The Lord shall come and all His saints with Him. Then shall the world see the Lord coming upon the clouds of heaven.

He would have them ever ready, and therefore He says, Watch.

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. […]

(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, …

(Hom. in Ev. ii, 3.) To watch is to keep the eyes open, and looking out for the true light, to do and to observe that which one believes, to cast away the darkness of sloth and negligence.

After the Lord set forth the uncertainty of the hour, he urges vigilance. And first he urges all; secondly, prelates in particular, at who, do you think, is the faithful and wise servant? etc. Regarding the first he does three things. First, he sets forth …

Watch therefore,....

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.

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.