Being ready for the day of the Lord doesn’t mean knowing when it will come. It means belonging to Jesus and living alert, clearheaded, and hopeful until he returns. In 1 Thessalonians 5:1-11, Paul tells believers that the day of the Lord will come suddenly, like a thief in the night, bringing destruction for those who aren’t ready. But believers are children of the light. God didn’t appoint us to suffer wrath but to receive salvation through Jesus.
Setting the Scene in 1 Thessalonians 5:1-11
In the previous lesson, Paul comforted grieving believers by explaining that the dead in Christ will rise first, and then living believers will be caught up together with them to meet the Lord (1 Thessalonians 4:13-18). Now Paul addresses a related question with the same phrase he used earlier, “now about” (peri de). The Thessalonians wanted to know when all this would happen.
Whenever Christians talk about the rapture, a second question comes up: Will believers go through the tribulation? The tribulation is a time of global judgment, deception, and suffering described in passages like Daniel 9, Mark 13, and Revelation. Many interpreters, especially in dispensational traditions, believe it will last seven years, based on the final “seven” in Daniel 9:27 (The Tribulation and the Antichrist).
Christians answer the timing question in three main ways. The pretribulation view holds that Jesus will rapture the church before the tribulation begins. It was systematically taught by the Irish Bible teacher John Nelson Darby in the 1800s, spread widely through the Scofield Reference Bible (1909), and was popularized by books like Hal Lindsey’s The Late Great Planet Earth and the Left Behind series. The midtribulation or prewrath view holds that believers will face part of the tribulation but be taken before God’s wrath is poured out; Marvin Rosenthal’s The Pre-Wrath Rapture of the Church is a well-known defense. The posttribulation view holds that the church will endure the tribulation and be gathered when Jesus returns at the end. Many early church leaders, including Irenaeus, expected the church to face persecution until Christ’s return. Faithful, Bible-loving scholars hold each of these views (What Is Premillennialism?). These are secondary issues, and there is room for grace. And here’s the good news: Paul doesn’t try to settle the debate in this passage. He keeps it practical.
No One Knows the Date
Paul starts by setting aside the question of timing.
1 Thessalonians 5:1-3 Now, brothers and sisters, about times and dates we do not need to write to you, for you know very well that the day of the Lord will come like a thief in the night. While people are saying, “Peace and safety,” destruction will come on them suddenly, as labor pains on a pregnant woman, and they will not escape.
The phrase “times and dates” uses two Greek words, chronos and kairos, the same pair Jesus used when he told his disciples it wasn’t for them to know the times or dates the Father had set (Acts 1:7). Paul had already taught the Thessalonians that the day would come unexpectedly, “like a thief in the night,” an image that goes back to Jesus himself (Matthew 24:43).
That hasn’t stopped people from trying. In the early third century, Hippolytus calculated that the end would come around AD 500. In the 1840s, William Miller, a Baptist preacher, used the 2,300 days of Daniel 8:14 to predict Christ’s return in 1844. Thousands of followers waited, and when October 22, 1844, came and went, it became known as the Great Disappointment. In 1988, former NASA engineer Edgar Whisenant sold millions of copies of 88 Reasons Why the Rapture Will Be in 1988. He was wrong, then wrong again when he revised his date. Today, social media is full of predictions tied to blood moons, wars, and elections. History proves one thing: everyone who has set a date has been wrong. Jesus was clear.
Matthew 24:36 But about that day or hour no one knows, not even the angels in heaven, nor the Son, but only the Father.
Our job isn’t to figure out when, but to live like it could be any time.
Peace and Safety
Paul says the day will come when people are saying, “Peace and safety.” Many scholars hear an echo of Roman propaganda. The empire celebrated the Pax Romana, and Roman coins and inscriptions honored peace (pax) and security (securitas). In a city like Thessalonica, which enjoyed Rome’s favor as a free city, people may have felt secure under Caesar. Paul warns that no empire can guarantee real security.
The “day of the Lord” was a familiar Old Testament theme. It describes the moment when God steps into history to judge evil and save his people. The prophets described it as a day of darkness and judgment (Amos 5:18-20; Zephaniah 1:14-16), but also as a day of rescue.
Joel 2:31-32 The sun will be turned to darkness and the moon to blood before the coming of the great and dreadful day of the Lord. And everyone who calls on the name of the Lord will be saved; for on Mount Zion and in Jerusalem there will be deliverance, as the Lord has said, even among the survivors whom the Lord calls.
Peter quoted this prophecy in his first sermon on the day of Pentecost (Acts 2:16-21). The day of the Lord has two sides: wrath for those who reject God and salvation for everyone who calls on his name. Paul compares its arrival to labor pains: sudden, unavoidable, and certain. For most of the Thessalonians, who had come from pagan backgrounds, this whole idea was new. But Paul says they already knew it well, because he had taught them Old Testament theology reframed around Jesus.
Children of the Light
Then Paul turns to believers.
1 Thessalonians 5:4-6 But you, brothers and sisters, are not in darkness so that this day should surprise you like a thief. You are all children of the light and children of the day. We do not belong to the night or to the darkness. So then, let us not be like others, who are asleep, but let us be awake and sober.
Paul draws a sharp contrast between two groups. Those who aren’t ready live in darkness. They are asleep, unaware, living as if the future doesn’t matter. Believers are children of the light and of the day. A thief only surprises people who are asleep in the dark. Those living in the light won’t be caught off guard.
So Paul calls believers to stay awake and be sober. The Greek word nēphō means to be self-controlled and clearheaded, not intoxicated. It applies to alcohol, but also to anything that dulls our spiritual senses, including obsessive speculation that distracts us from faithful living.
Armor for the Waiting
Paul continues with a military picture.
1 Thessalonians 5:7-8 For those who sleep, sleep at night, and those who get drunk, get drunk at night. But since we belong to the day, let us be sober, putting on faith and love as a breastplate, and the hope of salvation as a helmet.
This image comes from Isaiah, where God puts on righteousness as a breastplate and salvation as a helmet (Isaiah 59:17). Paul later develops it into the full armor of God (Ephesians 6:10-17). Notice the familiar trio of faith, love, and hope, which Paul also mentioned at the start of this letter (1 Thessalonians 1:3). The helmet is the hope of salvation, a confident expectation that protects our minds when the world feels uncertain.
Not Destined for Wrath
Paul ends with the best news of all.
1 Thessalonians 5:9-11 For God did not appoint us to suffer wrath but to receive salvation through our Lord Jesus Christ. He died for us so that, whether we are awake or asleep, we may live together with him. Therefore encourage one another and build each other up, just as in fact you are doing.
Christians who hold a pretribulation view often point to verse 9 as evidence that the church will be spared the tribulation. Others understand it as a promise that believers will be spared God’s final judgment, whatever trials they face on earth. Either way, the heart of the promise is clear: God’s plan for his people is salvation through Jesus. Christ died for us so that whether we are “awake or asleep,” alive or dead when he returns, we will live with him. That ties right back to the comfort Paul gave in the previous chapter.
And once again, Paul ends with encouragement. The point of this teaching isn’t fear or speculation. It’s to build one another up.
What This Means for Us
It’s fine to study the end times and work out what you believe about the rapture and the tribulation (What Is the Rapture?). But don’t get so caught up in theories that you miss the point. Jesus is coming back. For some, that day will be terrifying. For those who belong to him, it will be liberating. In the middle of suffering, poverty, or uncertainty, there’s no reason to fret. Jesus will return with justice and salvation.
So the most important question isn’t which position you hold. It’s whether you are ready. Do you belong to Jesus? Are you living alert, clearheaded, and full of faith, love, and hope?
The Takeaway
Are you ready for the day of the Lord? No one knows when it will come, so stop guessing and stay ready. In 1 Thessalonians 5:1-11, Paul says the day will come like a thief, but believers are children of the light, not destined for wrath but for salvation through Jesus. Stay alert, live with hope, and encourage one another.
