4 But you, brethren, are not in darkness, so that this Day should overtake you as a thief. 5 You are all sons of light and sons of the day. We are not of the night nor of darkness. 6 Therefore let us not sleep, as others do, but let us watch and be sober. 7 For those who sleep, sleep at night, and those who get drunk are drunk at night. 8 But let us who are of the day be sober, putting on the breastplate of faith and love, and as a helmet the hope of salvation. 9 For God did not appoint us to wrath, but to obtain salvation through our Lord Jesus Christ, (1 Thessalonians 5:4–9, NKJV)
Christians (children of God) are children of the day. Therefore, we are to live watchfully and soberly in the light of truth. The contrast to the inebriation of darkness is easy to understand. Being “of the day” (v. 8) means living soberly in faith, love, and the hope of salvation we have in Jesus Christ. Yet, more and more Christians are partaking in the less than sober practice of drinking intoxicants. Defending “social drinking” of intoxicating beverages as a Christian’s liberty embraces the very thing Paul used to warn us against losing our spiritual alertness. Rather than justify the incremental loss of self-control and the corresponding loss of sharpness, we must refuse even the beginning of this activity associated with darkness (Eph. 5:18; 1 Pet. 4:3).
3 Jesus answered, “Neither this man nor his parents sinned, but that the works of God should be revealed in him. 4 I must work the works of Him who sent Me while it is day; the night is coming when no one can work. 5 As long as I am in the world, I am the light of the world.” (John 9:3–5, NKJV)
The diligence with which Jesus labored is a model of zeal, endurance, and accomplishment. As He prepared to heal a man who was blind from birth, He explained the principle which drove Him each day. He had been given work to do by His Father (who sent Him to the earth). His time on the earth was limited, and so He diligently went about doing His Father’s work (which was teaching the gospel and showing Himself to be “the light of the world” – the Christ, the Son of God). Just as the Father gave the Son work to do, Christians are “created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them” (Eph. 2:10). With Jesus as our model, let us be zealous to walk in (do, practice) the good works of God each day, by living soberly, righteously, and godly (Tit. 2:11-12). Night is coming for us all, when our time to labor for the Lord will end. So, as long as we have today, let us be diligent children of light who do the Father’s will, and “through faith and patience inherit the promises” (Heb. 6:9-12).
5 You are all sons of light and sons of the day. We are not of the night nor of darkness. 6 Therefore let us not sleep, as others do, but let us watch and be sober. 7 For those who sleep, sleep at night, and those who get drunk are drunk at night. (1 Thessalonians 5:5–7, NKJV)
The return of the Lord will not overtake Christians suddenly and unexpectedly, because we “are not in darkness” (1 Thess. 5:4). Paul uses light and day to describe the moral readiness of Christians concerning the coming of Jesus. What does it mean to be “sons of light” and “sons of the day?” The gospel called us out of sin’s darkness (1 Pet. 2:11). By the redemption we have in Christ we have been delivered from the power of darkness and conveyed into the Son’s kingdom (Col. 1:13). We used to live in the darkness of sin, “but now you are light in the Lord. Walk as children of light” (Eph. 5:8). Darkness and night describe the moral slumber of living in sin. Just as we are unaware of our surroundings in sleep, the darkness of night gives cover to sin and its excesses. We must refuse to be lulled to sleep by the enticements of sin. Let us live vigilantly in truth and righteousness, abstaining from everything that intoxicates the mind and soul. Sons of light are sober, diligently living with self-control and not indulging the flesh with sin. That is why sons of light are ready for the Lord’s return. Walk in the light of truth, not in the darkness of sin (1 Jno. 1:5-10). Be ready of His return.