The interpretation timeline
1 Thessalonians 5:4 Douay-Rheims

But you, brethren, are not in darkness, that that day should overtake you as a thief.

A.D. 220 – 1871 8 witnesses 9 excerpts

Patristic

before A.D. 750
220
A.D.
Tertullian Patristic
c. A.D. 150–220
“Nay, but this whole world is the one house of all; in which world it is more the heathen, who is found in darkness, whom the grace of God enlightens, than the Christian, who is already in God's light. Finally, it is one "straying" which is ascribed to the ewe and the drachma: (and this is an evidence in my favour); for if the parables had been composed with a view to a Christian sinner, after the loss of his faith, a second loss and restoration of them would have been noted.”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“"But ye, brethren, are not in darkness, that that day should overtake you as a thief." Here he speaks of a life that is dark and impure. For it is just as corrupt and wicked men do all things as in the night, escaping the notice of all, and inclosing themselves in darkness. For tell me, does not the adulterer watch for the evening, and the thief for the night? Does not the violator of the tombs carry on all his trade in the night? What then? Does it not overtake them as a thief? Does it not come upon them also uncertainly, but do they know it beforehand? How then does he say, "Ye have no need that aught be written unto you"? He speaks here not with respect to the uncertainty, but with respect to the calamity, that is, it will not come as an evil to them. For it will come uncertainly indeed even to them, but it will involve them in no trouble. "That that Day," he says, "may not overtake you as a thief." For in the case of those who are watching and who are in the light, if there should be any entry of a robber, it can do them no harm: so also it is with those who live well. But those who are sleeping he will strip of everything, and go off; that is, those who are trusting in the things of this life.”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“Therefore, not to know the times is something different from decay of morals and love of vice. For, when the apostle Paul said, "Don't allow your thinking to be shaken nor be frightened, neither by word nor by epistle as sent from us, as if the day of the Lord were at hand," he obviously did not want them to believe those who thought the coming of the Lord was already at hand, but neither did he want them to be like the wicked servant and say, "My Lord is long in coming," and deliver themselves over to destruction by pride and riotous behavior. Thus, his desire that they should not listen to false rumors about the imminent approach of the last day was consistent with his wish that they should await the coming of their Lord fully prepared, packed for travel and with lamps burning. He said to them, "But you, brothers, are not in darkness that that day should overtake you as a thief, for all you are the children of light and children of the day; we are not of the night nor of darkness."”
Source
“On the verse: "This is the day which the Lord has made." What we have sung to our Lord let us put into practice with his help. To be sure, every day has been made by the Lord, but with good reason has it been said of a particular day, "This is the day which the Lord has made." We read that when he created heaven and earth, "God said, 'Let there be light,' and there was light, and God called the light Day, and the darkness Night." But there is another day, well established and definitely to be commended by us, concerning which the apostle says, "Let us walk becomingly as in the day." That day, commonly called "today," is caused by the rising and setting of the sun. There is still another day by which the word of God shines on the hearts of the faithful and dispels the darkness, not of the eyes, but of evil habits. Let us, therefore, recognize this light; let us rejoice in it; let us pay attention to the apostle when he says, "For we are children of the light and children of the day. We are not of night nor of darkness."”
Source

Scholastic

c. 1100 – 1500
1272
A.D.
Thomas Aquinas Catholic
1225–1274
“Above he corrected what needed correcting among them; here he admonishes them for the future, and first he sets down the admonition; second, the prayer, at the place "but God himself." Now these two are necessary for us. For since the good things we do are from free will, man therefore needs admonition, and since they are also from grace, he needs prayer. Concerning the first he does two things: first he exhorts them to prepare themselves for the future judgment; second he shows the manner of preparing, at the place "wherefore comfort." Again, the first part divides into two: first he shows what the condition of the future judgment is; second, how they should prepare themselves for it, at the place "therefore let us not sleep." Likewise the first divides into two: first he sets forth the condition of the future judgment; second he explains it, at the place "for when." Likewise, first he sets at rest their anxiety concerning knowledge of the future coming; second he shows what they do know concerning it, at the place "for you yourselves." He says therefore: it was necessary that I write about the aforesaid matters, because you needed it. But concerning the times, namely summer, winter, or rather, what the future times would be, it was not necessary, because some of these things are reserved to the divine knowledge alone. Matthew 24:36 and Mark 13:32: of that day or hour no one knows, neither the angels in heaven, nor the Son, but the Father, etc. Acts 1:7: it is not for you to know the times or the moments, etc. Ecclesiastes 7:1: what need is there for man to seek things greater than himself, since he does not know what is of use to him in life, in the number of the days of his life? etc. And therefore this was not necessary to write, because that which is to be known, you know, namely that the day of the Lord is as a thief in the night, etc. Now all days are the Lord's. Psalm 118:91: by your ordinance the days continue. But this day is especially the Lord's, because in all things he does his own will, which is fulfilled in the good, who are brought to the end foreknown by God, namely, salvation. 1 Timothy 2:4: he wills all men to be saved, etc. In the wicked, because they will be punished. Psalm 74:3: when I shall have taken the time, I will judge according to justice. This day will come like a thief, that is, without premeditation. Luke 13:36: if the father of the household knew at what hour the thief would come, etc. 2 Peter 3:10: the day of the Lord will come like a thief. Apocalypse 3:3: I will come to you as a thief. But how is the day said to come in the night? One must know that both are true: for it comes in the day on account of the manifestation of hearts — 1 Corinthians 4:5: until the Lord comes, who will both bring to light the hidden things of darkness, and manifest the counsels of hearts — but in the night on account of uncertainty. Matthew 25:6: at midnight a cry was made: behold, the bridegroom comes, etc. For it is uncertain at what hour it will be. Then, when he says "for when they shall have said," he explains what he had said, first as regards the wicked; second as regards the good, at the place "but you." Concerning the first he does two things: first he describes the presumption of the wicked; second, the danger of delay. He says therefore: it will come like a thief, because unforeseen. For when they shall have said "peace," as regards present things, that is, while they live tranquilly, thus they are deceived. Wisdom 14:22: living in the great war of ignorance, they call so many and such great evils peace. And "security," as regards future things. Luke 12:19: my soul, you have many goods laid up for many years; rest, eat, drink, and feast. But against this, Luke 21:26: men withering away for fear and expectation of the things that shall come upon the whole world, etc. Therefore there is no security. The solution is twofold. One is Augustine's, which is this: at that time there will be some who are good, and they will be afflicted, will mourn, and will wait; and of this it is said, Luke 21:26: "withering away" from the lack of pleasures and the abundance of evils, etc., but among the wicked there will be peace and security. The other solution is given in the Gloss. Then, when he says "then sudden," he describes the danger under four points. First, because it is sudden, at the place "sudden." Isaiah 30:13: suddenly, when it is not looked for, its destruction shall come. Second, because it is deadly, at the place "destruction." Job 18:14: let destruction trample over him as a king, etc. Third, because it is afflictive, at the place "sorrow." Psalm 47:7: there, pains as of a woman in labor, etc. Fourth, because it is inescapable, at the place "and they shall not escape." Job 11:20: escape shall perish from them. From the wrath of God there is now escape to his mercy, but there it is not the time of mercy, but of justice. Then, when he says "but you," he explains what he had said as regards the good, and he does two things: first he excepts the good from the fellowship of the wicked; second he assigns the reason, at the place "for you are all." He says therefore: "you are not in darkness," because you have been enlightened by Christ concerning that day, and therefore it is not unforeseen by you. John 8:12: he who follows me does not walk in darkness, but shall have the light of life. And the reason for this is at the place: "for you are all children of light." For he asserts that they are children of light and of the day. Now some are called children of a thing in Scripture on account of an abundance in that thing. Isaiah 5:1: in a horn, a son of oil, that is, having much oil. Those, therefore, who partake much of the day and of light are called their children. This light is the faith of Christ. John 8:12: I am the light of the world, etc. John 12:36: believe in the light, that you may be children of light. Likewise, of the day. For just as day comes to be from light, so from the faith of Christ comes day, namely, the honesty of good works. Romans 13:12: the night is passed, etc. And therefore "we are" not "children of the night," that is, of unbelief, "nor of darkness," that is, of sins. Romans 13:12: let us therefore cast off from us the works of darkness, etc. Then, when he says "therefore let us not sleep," etc., he shows how they should prepare themselves for that coming, first, how, through the requital of evil deeds; second, through the observance of good deeds, at the place "having put on." Concerning the first he does two things: first he sets down the admonition, second its reason, at the place "for they who sleep." He says therefore: since the day of the Lord is like a thief — Luke 12:39: if the father of the household knew at what hour the thief would come, he would certainly watch — therefore you, since you know, should watch. Hence he says "therefore let us not sleep," with the sleep of sin. Ephesians 5:14: rise, you who sleep, and arise from the dead. Likewise, nor with the sleep of laziness. Proverbs 6:9: how long will you sleep, O sluggard? etc. But "let us watch," through diligence. Matthew 24:42: watch therefore, etc. And for this it is necessary that "we be sober," so that both body and mind be sober, that is, not occupied with pleasures and the cares of the world. Luke 21:34: take heed to yourselves, lest perhaps your hearts be weighed down with surfeiting and drunkenness. 1 Peter 5:8: be sober, and watch. Now the reason for this is drawn from the fitness of the time: because those who sleep, or are drunk, do so at night. But we are not in the night. Therefore, etc. He says therefore, "for they who sleep, sleep in the night," that is, they assign the time of night to rest, but the day to work. Psalm 103:22: the sun arose, and they gathered together, and they shall be laid down in their dens. And again there, 23: man shall go forth to his work, and to his labor until the evening. Likewise, some abstain from wine in the day on account of business to be carried out, but at night they do not care so much. Job 24:15: the eye of the adulterer watches for darkness. Sleep, therefore, and drunkenness befit the night, because, occupied by the night of unbelief and the darkness of sins, they are drunk, having, through love of present things, no hope of future things. Ephesians 4:19: who despairing, have given themselves up to lasciviousness, unto the working of all uncleanness, unto covetousness, etc. But "we who are of the day," that is, belonging to the day of honesty and faith, "let us be sober." Romans 13:13: let us walk honestly, as in the day. Then, when he says "having put on," etc., he shows how they should prepare themselves through good things; and first he sets down the general admonition; second, the special, at the place "wherefore." Likewise the first divides into two: first he sets down the admonition itself; second, its reason, at the place "for God has not appointed." Now there are in man two principal members, which are accustomed to be protected in wars, namely the heart, which is the principle of life, and the head, namely the principle of outward motion, from which come the senses, and in some manner the nerves. And the heart is protected by the breastplate, the head by the helmet. The spiritual life in us is Christ, through whom the soul lives, and the Lord dwells in us through faith. Ephesians 3:17: that Christ may dwell through faith in your hearts. He dwells also through charity — 1 John 4:16: he who abides in charity abides in God, and God in him — which charity informs faith. And therefore we ought to have faith and charity. Hence he says "the breastplate of faith and charity," because it protects the vital parts, and "the helmet," "the hope of salvation," which is the principle of spiritual motion, which comes from the intention of the end, which we hope to attain. Then, when he says "for God has not appointed us," he shows the reason for how this works in us. And first from the divine preordination, second from the grace of Christ, third he shows the manner of attaining salvation. He says therefore "for he has not appointed," that is, he has not ordained. John 15:16: I have appointed you, namely the saints, that you should go, etc. God has not appointed us "unto wrath," that is, to this end, that we should incur his wrath. Wisdom 1:13: God did not make death. Ezekiel 18:23: is it my will that the wicked man should die? says the Lord God, etc. But "unto the acquisition," that is, that we should acquire salvation. Matthew 11:12: the kingdom of heaven suffers violence, and the violent bear it away. 1 Peter 2:9: you are a chosen generation, a royal priesthood, etc. And this through the grace of Christ, therefore he says "through our Lord," etc. Acts 4:12: there is no other name under heaven given to men, whereby we must be saved. "Who died for us," that is, he saved us, by dying for us. 1 Peter 3:18: the just died for the unjust, that he might offer us to God, being indeed put to death in the flesh, but brought to life in the spirit. And the manner of attaining is that Christ taught us by working our salvation, and this by dying and rising again. Romans 4:25: he was delivered up for our sins, and rose again for our justification. And therefore he says "whether we watch, or sleep, we should live together with him." Romans 14:8: whether we live, or whether we die, we are the Lord's. Then, when he says "wherefore," he teaches us how we should prepare ourselves as regards the special conditions of persons. And concerning this he does three things: first he shows how they ought to behave toward equals; second, how subjects should behave toward their superior, at the place "and we beseech you"; third, how superiors should behave toward subjects, at the place "and we beseech you." Now we owe to equals comfort in adversities; hence he says "comfort one another." Likewise, edification in examples; hence he says "and edify," etc. Romans 14:19: let us keep the things that are of edification, one toward another. Now subjects owe to their superiors, first, recognition of benefits, second, charity, third, peace. Hence "that you know," that is, that you recognize their benefits. Hebrews, last chapter: remember your prelates, etc. You should know, I say, first, on their part, because they bear the greatest labor for you. Hence he says "those who labor among you," for your good. 2 Timothy 2:3: labor as a good soldier of Christ, etc. Second, on the part of God. And therefore reverence is to be shown to them as to God. Hence he says "and are over you in the Lord," that is, in the place of the Lord. 2 Corinthians 2:10: if I have forgiven anything, to you, in the person of Christ. Third, on your part, because they are useful to you. Hence he says: "and admonish you," that you may have, etc. Therefore, second, you owe them charity "more abundantly," that is, above others. Third, peace, on account of their work. But certain people act against this. Amos 5:10: they have hated him that rebuketh in the gate, etc. Ecclesiasticus 19:5: he who hates correction, his life shall be shortened. But you, keep peace on account of the work of correction, which properly pertains to their office. Psalm 119:7: when I spoke to them, they fought against me without cause.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“But ye, brethren, are not in darkness,.... In a state of unregeneracy, which is a state of darkness, blindness, and ignorance, and which is the condition of all men by nature; they are born in darkness, and are brought up in it, and willingly, walk in it; they are covered with it, as the earth was covered with darkness in its first creation; and dwell in it, as the Egyptians did for some days, in thick darkness, darkness which might be felt; their understandings are darkened with respect to the true knowledge of God, the nature of sin, the way of salvation by Christ, the work of the spirit of God upon the soul, and the necessity of it, the Scriptures of truth, and the mysteries of the Gospel; and which is the case of God's elect themselves, while unregenerate: but now these persons were called out of darkness, turned from it, and delivered from the power of it; and therefore knew that the day of the Lord comes as above described, by the metaphors of a thief in the night, and a woman with child, and needed not to be informed about that matter: or that that day should overtake you as a thief; or seize and lay hold upon you as a thief who comes in the dark, and lays hold upon a person suddenly; but these saints were not in the dark, but in the light, and so could see when the day of the Lord came; and would not be surprised with it, as a man is seized with terror and fright, when laid hold on by a thief; since they would be, or at least should be on their watch, and be looking out for, and hasting to the coming of the day of God.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“But ye, brethren, are not in darkness - Probably St. Paul refers to a notion that was very prevalent among the Jews, viz.: that God would judge the Gentiles in the night time, when utterly secure and careless; but he would judge the Jews in the day time, when employed in reading and performing the words of the law. The words in Midrash Tehillim, on Psa 9:8, are the following: When the holy blessed God shall judge the Gentiles, it shall be in the night season, in which they shall be asleep in their transgressions; but when he shall judge the Israelites, it shall be in the day time, when they are occupied in the study of the law. This maxim the apostle appears to have in view in the 4th, 5th, 6th, 7th, and 8th verses. (Th1 5:4-8)”
Source
1849
A.D.
1774–1849
“Overtake you. It is a subject of astonishment, that some people are so childishly afraid of the last day, that they cannot think of it without consternation, lest it should happen in their time. Weak souls! Do they not recollect that death will certainly overtake them, and that will be to them individually the end of the world, and the last day. The whole world then does perish as far as regards them. (Haydock)”
Source
1871
A.D.
1871
“not in darkness--not in darkness of understanding (that is, spiritual ignorance) or of the moral nature (that is, a state of sin), Eph 4:18. that--Greek, "in order that"; with God results are all purposed. that day--Greek, "THE day"; the day of the Lord (Heb 10:25, "the day"), in contrast to "darkness." overtake--unexpectedly (compare Joh 12:35). as a thief--The two oldest manuscripts read, "as (the daylight overtakes) thieves" (Job 24:17). Old manuscripts and Vulgate read as English Version.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.