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Matthew 24:42

Watch ye therefore, because ye know not what hour your Lord will come.

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The verse in its languages

Vulgate (Clementine)
Vigilate ergo, quia nescitis qua hora Dominus vester venturus sit.
Greek New Testament (SBLGNT)
γρηγορεῖτε οὖν, ὅτι οὐκ οἴδατε ποίᾳ ἡμέρᾳ ὁ κύριος ὑμῶν ἔρχεται.

Haydock's commentary

Watch ye, therefore. That men might not be attentive for a time only, but preserve a continual vigilance, the Almighty conceals from them the hour of their dissolution: they ought therefore to be ever expecting it, and ever watchful. But to the eternal infamy of Christians be it said, much more diligence is used by the worldly wise for the preservation of their wealth, than by the former for the salvation of their immortal souls. Though they are fully aware that the Lord will come, and like a thief in the night, when they least expect him, they do not persevere watching, nor guard against the irreparable misfortune of quitting the present life without previous preparation. Therefore will the day come to the destruction of such as are reposed in sleep. (St. Chrysostom, hom. lxxviii. on S. Matt.)

Of what importance is it then that we should be found watching, and properly attentive to the one thing necessary, the salvation of our immortal souls. For what will it avail us, if we have gained the whole world, which we must then leave, and lose our immortal souls, which, owing to our supine neglect to these admonitions of Jesus Christ, must suffer in hell-flames for all eternity? (Haydock)

From Haydock's Catholic Bible Commentary, 1859, in the transcription made by Todd Easton and kept online by John Paul Wohlschied at johnblood.gitlab.io/haydock.

The Fathers on this verse

St Jerome Catena Aurea on verses 42-44

Having declared that "of that hour knoweth no man, but the Father only," He shews that it was not expedient for the Apostles to know, that being ignorant they might live in perpetual expectation of His coming, and thus concluding the whole, He says, "Watch therefore, &c." And He does not say, "Because we know not," but "Because ye know not," shewing that He Himself is not ignorant of the day of judgment.

St John Chrysostom Catena Aurea on verses 42-44

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

St Gregory the Great Catena Aurea on verses 42-44

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.

Origen Catena Aurea on verses 42-44

Those of more plain understanding say, that He spoke this of His second coming; but others would say that it applies to an intellectual coming of the word into the understanding of the disciples, for as yet He was not in their understanding as He was to be.

St Augustine Catena Aurea on verses 42-44

He said this "Watch," not to those only who heard Him speak at the time, but to those who came after them, and to us, and to all who shall be after us, until His second coming, for it touches all in a manner. That day comes to each one of us, when it comes to him to go out of the world, such as he shall be judged, and therefore ought every Christian to watch that the Lord's coming may not find him unprepared; and he will be unprepared for the day of His coming, whom the last day of his life shall find unprepared.

St Augustine Catena Aurea on verses 42-44

non occ.: Foolish are all they, who either profess to know the day of the end of the world, when it is to come, or even the end of their own life, which no one can know unless be is illuminated by the Holy Spirit.

St Jerome Catena Aurea on verses 42-44

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

Origen Catena Aurea on verses 42-44

"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.

St Gregory the Great Catena Aurea on verses 42-44

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 be would have been secure from the thief; that is, looking forward to the coming of the Judge, who takes our lives unawares, be would meet Him with penitence, and not perish impenitent. And the Lord would therefore have the last hour unknown, that it might always be in suspense, and that being unable to foresee it, we might never be unprepared for it.

St John Chrysostom Catena Aurea on verses 42-44

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

St Irenaeus Against Heresies: Book IV, Chapter XXXVI. The prophets were

3. And therefore did the Lord say to His disciples, to make us become good workmen: “Take heed to yourselves, and watch continually upon every occasion, lest at any time your hearts be overcharged with surfeiting and drunkenness, and cares of this life, and that day shall come upon you unawares; for as a snare shall it come upon all dwelling upon the face of the earth.” “Let your loins, therefore, be girded about, and your lights burning, and ye like to men who wait for their lord, when he shall return from the wedding.” “For as it was in the days of Noe, they did eat and drink, they bought and sold, they married and were given in marriage, and they knew not, until Noe entered into the ark, and the flood came and destroyed them all; as also it was in the days of Lot, they did eat and drink, they bought and sold, they planted and builded, until the time that Lot went out of Sodom; it rain …

St Irenaeus Against Heresies: Book V, Chapter X. By a comparison drawn

1. This truth, therefore, [he declares], in order that we may not reject the engrafting of the Spirit while pampering the flesh. “But thou, being a wild olive-tree,” he says, “hast been grafted into the good olive-tree, and been made a partaker of the fatness of the olive-tree.” As, therefore, when the wild olive has been engrafted, if it remain in its former condition, viz., a wild olive, it is “cut off, and cast into the fire;” but if it takes kindly to the graft, and is changed into the good olive-tree, it becomes a fruit-bearing olive, planted, as it were, in a king’s park ( paradiso ): so likewise men, if they do truly progress by faith towards better things, and receive the Spirit of God, and bring forth the fruit thereof, shall be spiritual, as being planted in the paradise of God. …

The Didache The Teaching of the Twelve Apostles, Chapter XVI. Watchfulness; The Coming of the Lord

1. 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. 2. 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. 3. 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; 4. for when lawlessness increaseth, they shall hate and persecute and betray one another, and then shall appear the world-deceiver as the 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. 5. …

St Augustine On the Morals of the Catholic Church, Of Justice and Prudence

45. With equal brevity we must treat of prudence, to which it belongs to discern between what is to be desired and what to be shunned. Without this, nothing can be done of what we have already spoken of. It is the part of prudence to keep watch with most anxious vigilance, lest any evil influence should stealthily creep in upon us. Thus the Lord often exclaims, "Watch;" and He says, "Walk while ye have the light, lest darkness come upon you." And then it is said, "Know ye not that a little leaven leaveneth the whole lump?" And no passage can be quoted from the Old Testament more expressly condemning this mental somnolence, which makes us insensible to destruction advancing on us step by step, than those words of the prophet, "He who despiseth small things shall fall by degrees." On this topic I might discourse at length did our haste allow of it. …

St John Chrysostom The Homilies of St. John Chrysostom, Matthew XXIV. 32, 33

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.

St John Chrysostom The Commentary and Homilies of St. John Chrysostom on Galatians and Ephesians, Ephesians 6:14

Wherefore, I beseech you, let us do all we can, so as to lay up no treasure here; for if the thief should come, we must in a moment arise and depart. “Watch,” saith He, “for ye know not at what hour the thief cometh” ( Matt. xxiv. 42, 43 .), thus naming death. O then, before he cometh, let us send away everything before us to our native country; but here let us be “well girded,” that we may be enabled to overcome our enemies, whom God grant that we may overcome, through the grace and lovingkindness of our Lord Jesus Christ, with Whom together with the Holy Ghost, be unto the Father glory, strength, honor forever and ever. Amen.

St John Chrysostom The Homilies of St. John Chrysostom on Philippians, Colossians, and Thessalonians, 1 Thessalonians 5:1,2

Ye see how many advantages there are, and yet there are more than these that arise from not knowing the time of our end. Meanwhile it is sufficient to learn these. On this account He so cometh as a thief in the night; that we may not abandon ourselves to wickedness, nor to sloth; that He may not take from us our reward. “For yourselves know perfectly,” he says. Why then are you curious, if you are persuaded? But that the future is uncertain, learn from what Christ has said. For that on this account He said it, hear what he says, “Watch therefore: for ye know not at what hour” the thief “cometh.” ( Matt. xxiv. 42 .) On this account also Paul said,

St Athanasius Against the Arians. (Orationes contra Arianos IV.), Texts Explained; Eleventhly, Mark xiii. 32 and Luke ii. 52. Arian explanation of the former text is against the Regula Fidei; and against the context. Our Lord said He was ignorant of the Day, by reason of His human nature. If the Holy Spirit knows the Day, therefore the Son knows; if the Son knows the Father, therefore He knows the Day; if He has all that is the Father's, therefore knowledge of the Day; if in the Father, He knows the Day in the Father; if He created and upholds all things, He knows when they will cease to be. He knows not as Man, argued from Matt. xxiv. 42. As He asked about Lazarus's grave, &c., yet knew, so He knows; as S. Paul says, 'whether in the body I know not,' &c., yet knew, so He knows. He said He knew not for our profit, that we be not curious (as in Acts i. 7, where on the contrary He did not say He knew not). As the Almighty asks of Adam and of Cain, yet knew, so the Son knows[as God]. Again, He advanced in wisdom also as man, else He made Angels perfect before Himself. He advanced, in that the Godhead was manifested in Him more fully as time went on

Chapter XXVIII. Texts Explained; Eleventhly, Mark xiii. 32 and Luke ii. 52 Arian explanation of the former text is against the Regula Fidei; and against the context. Our Lord said He was ignorant of the Day, by reason of His human nature. If the Holy Spirit knows the Day, therefore the Son knows; if the Son knows the Father, therefore He knows the Day; if He has all that is the Father’s, therefore knowledge of the Day; if in the Father, He knows the Day in the Father; if He created and upholds all things, He knows when they will cease to be. He knows not as Man, argued from Matt. xxiv. 42 . As He asked about Lazarus’s grave, &c., yet knew, so He knows; as S. Paul says, ‘whether in the body I know not,’ &c., yet knew, so He knows. He said He knew not for our profit, that we be not curious (as in Acts i. 7 , where on the contrary He did not say He knew not). …

St Athanasius Against the Arians. (Orationes contra Arianos IV.), Texts Explained; Eleventhly, Mark xiii. 32 and Luke ii. 52. Arian explanation of the former text is against the Regula Fidei; and against the context. Our Lord said He was ignorant of the Day, by reason of His human nature. If the Holy Spirit knows the Day, therefore the Son knows; if the Son knows the Father, therefore He knows the Day; if He has all that is the Father's, therefore knowledge of the Day; if in the Father, He knows the Day in the Father; if He created and upholds all things, He knows when they will cease to be. He knows not as Man, argued from Matt. xxiv. 42. As He asked about Lazarus's grave, &c., yet knew, so He knows; as S. Paul says, 'whether in the body I know not,' &c., yet knew, so He knows. He said He knew not for our profit, that we be not curious (as in Acts i. 7, where on the contrary He did not say He knew not). As the Almighty asks of Adam and of Cain, yet knew, so the Son knows[as God]. Again, He advanced in wisdom also as man, else He made Angels perfect before Himself. He advanced, in that the Godhead was manifested in Him more fully as time went on

45. But for them, when they thus blaspheme the Spirit, they must expect no remission ever of such irreligion, as the Lord has said; but let us, who love Christ and bear Christ within us, know that the Word, not as ignorant, considered as Word, has said ‘I know not,’ for He knows, but as shewing His manhood, in that to be ignorant is proper to man, and that He had put on flesh that was ignorant, being in which, He said according to the flesh, ‘I know not.’ And for this reason, after saying, ‘No not the Son knows,’ and mentioning the ignorance of the men in Noah’s day, immediately He added, ‘Watch therefore, for ye know not in what hour your Lord doth come,’ and again, ‘In such an hour as ye think not, the Son of man cometh.’ For I too, having become as you for you, said ‘no, not the Son.’ For, had He been ignorant divinely, He must have said, ‘Watch therefore, for I know not,’ and, ‘In an …

St Athanasius Against the Arians. (Orationes contra Arianos IV.), Texts Explained; Eleventhly, Mark xiii. 32 and Luke ii. 52. Arian explanation of the former text is against the Regula Fidei; and against the context. Our Lord said He was ignorant of the Day, by reason of His human nature. If the Holy Spirit knows the Day, therefore the Son knows; if the Son knows the Father, therefore He knows the Day; if He has all that is the Father's, therefore knowledge of the Day; if in the Father, He knows the Day in the Father; if He created and upholds all things, He knows when they will cease to be. He knows not as Man, argued from Matt. xxiv. 42. As He asked about Lazarus's grave, &c., yet knew, so He knows; as S. Paul says, 'whether in the body I know not,' &c., yet knew, so He knows. He said He knew not for our profit, that we be not curious (as in Acts i. 7, where on the contrary He did not say He knew not). As the Almighty asks of Adam and of Cain, yet knew, so the Son knows[as God]. Again, He advanced in wisdom also as man, else He made Angels perfect before Himself. He advanced, in that the Godhead was manifested in Him more fully as time went on

49. The Son then did know, as being the Word; for He implied this in what He said, ‘I know but it is not for you to know;’ for it was for your sakes that sitting also on the mount I said according to the flesh, ‘No, not the Son knoweth,’ for the profit of you and all. For it is profitable to you to hear so much both of the Angels and of the Son, because of the deceivers which shall be afterwards; that though demons should be transfigured as Angels, and should attempt to speak concerning the end, you should not believe, since they are ignorant; and that, if Antichrist too, disguising himself, should say, ‘I am Christ,’ and should try in his turn to speak of that day and end, to deceive the hearers, ye, having these words from Me, ‘No, not the Son,’ may disbelieve him also. …

St Cyril of Jerusalem On the Clause, And Shall Come in Glory to Judge the Quick and the Dead; Of Whose Kingdom There Shall Be No End

4. The things then which are seen shall pass away, and there shall come the things which are looked for, things fairer than the present; but as to the time let no one be curious. For it is not for you , He says, to know times or seasons, which the Father hath put in His own power . And venture not thou to declare when these things shall be, nor on the other hand supinely slumber. For he saith, Watch, for in such an hour as ye expect not the Son of Man cometh . …

St Cyril of Jerusalem On the Clause, And Shall Come in Glory to Judge the Quick and the Dead; Of Whose Kingdom There Shall Be No End

6. A second sign. And ye shall hear of wars and rumours of wars . Is there then at this time war between Persians and Romans for Mesopotamia, or no? Does nation rise up against nation and kingdom against kingdom, or no? And there shall be famines and pesti lences and earthquakes in divers places . These things have already come to pass; and again, And fearful sights from heaven, and mighty storms . Watch therefore , He says; for ye know not at what hour your Lord doth come .