Ye are all the children of light - All who are Christians. The phrase" children of light" is a Hebraism, meaning that they were the enlightened children of God.

And the children of the day - Who live as if light always shone round about them. The meaning is, that in reference to the coming of the Lord they are as people would be in reference to the coming of a thief, if there were no night and no necessity of slumber. They would always be wakeful and active, and it would be impossible to come upon them by surprise. Christians are always to be wakeful and vigilant; they are so to expect the coming of the Redeemer, that he will not find them off their guard, and will not come upon them by surprise.

Ye are all the children of light - Ye are children of God, and enjoy both his light and life. Ye are Christians - ye belong to him who has brought life and immortality to light by his Gospel. This dispensation, under which ye are, has illustrated all the preceding dispensations; in its light all is become luminous; and ye, who walked formerly in heathen ignorance, or in the darkness of Jewish prejudices, are now light in the Lord, because ye have believed in him who is the light to lighten the Gentiles, and the glory and splendor of his people Israel.

We are not of the night, nor of darkness - Our actions are such as we are not afraid to expose to the fullest and clearest light. Sinners hate the light; they are enemies to knowledge; they love darkness; they will not receive instructions; and their deeds are such as cannot bear the light.

Ye are all children of light,.... Or enlightened persons, whose understandings were enlightened by the spirit of God, to see their lost state by nature, the exceeding sinfulness of sin, the insufficiency of their righteousness to justify them before God, the fulness, suitableness, and excellency of Christ's righteousness, the way of salvation by Christ, and that it is all of grace from first to last; to understand in some measure the Scriptures of truth, and the mysteries of the Gospel; to have knowledge of some things that are yet to be done on earth, as the bringing in of the fulness of the Gentiles, the conversion of the Jews, the destruction of antichrist, the second coming of Christ, the resurrection of the dead, the change of living saints, and the rapture of both up into the air to meet Christ, the burning of the world, and the new heavens and new earth, where Christ and his saints will dwell; as also to have some glimpse of the heavenly glory, of the unseen joys, and invisible realities of the other world: and this the apostle says of them all, in a judgment of charity, as being under a profession of the grace of God, and in a church state, and nothing appearing against them why such a character did not belong to them:

and the children of the day; of the Gospel day, in distinction from the night of Jewish darkness; and of the day of grace which was come upon their souls, in opposition to the night of ignorance and infidelity, which was past; and of the everlasting day of glory, being heirs of, and having a right unto, and a meetness for the inheritance of the saints in light:

we are not of the night, nor of darkness; that is not the children of darkness, as the Syriac and Arabic versions read; and the former changes the person, and reads, "ye are not the children of the night", &c. of the night of the legal dispensation, or of Gentile ignorance; or of a state of natural darkness, in unregeneracy and was no need to write unto them concerning the time and season of Christ's coming, and lays a foundation for the following exhortations.

Ye are all

In the text γὰρ for should be inserted after πάντες all. Ye are not in darkness for ye are sons of light.

Children of light (υἱοὶ φωτός)

More correctly, sons of light. See on Mark 3:17, and comp. Luke 16:8; John 12:36; Ephesians 5:8; Colossians 1:12. The Christian condition is habitually associated in N.T. with light: see Matthew 5:14, Matthew 5:16; John 3:21; John 8:12; Acts 26:18; 1 Peter 2:9; 1 John 1:7. The contrary condition with darkness: see John 3:19, John 3:20; Ephesians 5:8; 1 Peter 2:9; Matthew 4:16; Matthew 6:23, etc.

Of the night - of darkness (νυκτὸς - σκότους)

The genitive marks an advance of thought from ἐν σκότει in darkness, 1 Thessalonians 5:4. Ἑν indicates the element in which one is. The genitive, of darkness, points to nature and origin. To belong to darkness is more than to be in darkness.

Ye are all the children of light, and the children of the day: we are not of the night, nor of darkness.

5:5 Ye are all the children of light, and the children of the day. They are of the light, of the day, because they have come to Christ for light, and are taught of him. Hence on this subject they are fully informed.

We are not of the night, nor of darkness. Those are of the night, who turn away from the light and refuse to accept it.

5. The oldest manuscripts read, "FOR ye are all," &c. Ye have no reason for fear, or for being taken by surprise, by the coming of the day of the Lord: "For ye are all sons (so the Greek) of light and sons of day"; a Hebrew idiom, implying that as sons resemble their fathers, so you are in character light (intellectually and morally illuminated in a spiritual point of view), Lu 16:8; Joh 12:36.

are not of-that is, belong not to night nor darkness. The change of person from "ye" to "we" implies this: Ye are sons of light because ye are Christians; and we, Christians, are not of night nor darkness.

5:1-5 It is needless or useless to ask about the particular time of Christ's coming. Christ did not reveal this to the apostles. There are times and seasons for us to work in, and these are our duty and interest to know and observe; but as to the time when we must give up our account, we know it not, nor is it needful that we should. The coming of Christ will be a great surprise to men. Our Lord himself said so. As the hour of death is the same to each person that the judgment will be to mankind in general, so the same remarks answer for both. Christ's coming will be terrible to the ungodly. Their destruction will overtake them while they dream of happiness, and please themselves with vain amusements. There will be no means to escape the terror or the punishment of that day. This day will be a happy day to the righteous. They are not in darkness; they are the children of the light. It is the happy condition of all true Christians. But how many are speaking peace and safety to themselves, over whose heads utter destruction is hovering! Let us endeavour to awaken ourselves and each other, and guard against our spiritual enemies.