That You May Know: Jesus, Eternal Life, and the Confidence God Gives
We live in an age where people are constantly asking, “Is that true?” In the year 2000, there was only one major fact-checking website. Today there are hundreds. That tells us something about the world we live in. Information spreads faster than ever, but so does confusion, distortion, and misinformation.
That is not only a modern problem. The apostle John was writing into a world where false teaching about Jesus had already begun to spread. People were questioning who Jesus really was, what He had really done, and whether His death on the cross truly mattered. So as John closes his first letter, he gives the church a kind of spiritual fact-check. He wants believers to know what is true, to rest in what is true, and to live with confidence because of what God has revealed in Jesus Christ.
John’s message is clear: Jesus Christ is the Son of God, and true life is found only in Him.
Jesus Christ Is the Son of God
John writes that Jesus came “by water and blood.” That may sound strange at first, but John is giving testimony to the reality of Jesus’ life and mission. Jesus came by water, pointing to His baptism, where He publicly identified with sinners and was affirmed by the Father. He also came by blood, pointing to His real physical death on the cross, where He poured out His life as the atoning sacrifice for sin.
This matters because some false teachers in John’s day were claiming that Jesus only appeared to be human. They argued that the holy Son of God could not truly take on human flesh, truly suffer, or truly die. John rejects that completely. Jesus was not a divine illusion. He was not pretending to be human. He was and is fully God and fully man.
The humanity of Jesus is essential to the gospel. A symbolic death could not save real sinners. A pretend sacrifice could not atone for actual guilt. Only a real human being could stand in the place of human beings, and only the perfect Son of God could offer a sacrifice powerful enough to cover the sins of His people.
This is why John gives such strong testimony throughout his writings to Jesus’ humanity. Jesus grew tired. Jesus wept. Jesus thirsted. Jesus suffered. Jesus died. And after His resurrection, He invited Thomas to touch the scars in His hands and side. The same Jesus who died on the cross was the same Jesus who rose from the grave.
Sin Is a Terminal Condition
Why did Jesus have to die? Because sin is not a minor inconvenience. Sin is a terminal condition.
From the beginning of Scripture, God warned that sin brings death. Adam and Eve were told that rebellion against God would lead to death. The prophets repeated the warning. The New Testament teaches the same truth. Sin, when fully grown, brings forth death.
That is hard for us to hear, but it is necessary. Our sin is not merely a mistake, a weakness, or a bad habit. It is rebellion against the God who made us. It separates us from Him, breaks us spiritually, and leads to judgment.
In the Old Testament, God gave His people a system of sacrifices. Blood was shed again and again as a reminder that sin requires atonement. But those sacrifices were never the final answer. They were signs pointing forward to the one perfect sacrifice that would come.
Jesus is that sacrifice. He is the Lamb of God who takes away the sin of the world. His blood does what no animal sacrifice could ever fully do. His death truly atones. His resurrection truly gives life.
Eternal Life Is in the Son
John summarizes the testimony of God like this: God has given us eternal life, and this life is in His Son. Whoever has the Son has life. Whoever does not have the Son does not have life.
That is both simple and profound. Eternal life is not first a place, a reward, or a vague spiritual experience. Eternal life is found in relationship with Jesus. To have the Son is to have life because Jesus Himself is life.
This means Christianity is not finally about religious performance. It is not about proving we are good enough. It is not about spiritual self-improvement. It is about receiving life from the Son of God.
John says he writes these things so that believers may know they have eternal life. That word “know” matters. God does not want His people to live in constant uncertainty, fear, and spiritual insecurity. He wants us to have confidence in Christ.
Confidence When Our Hearts Doubt
Even sincere Christians can struggle with assurance. We sin, and then we wonder if God still loves us. We fall back into patterns we thought we had outgrown, and we wonder if Jesus’ work really applies to us. We feel guilt, shame, distance, and discouragement.
John knows this experience. Earlier in the letter, he says that if anyone sins, we have an advocate with the Father, Jesus Christ the righteous. That means Jesus stands for us. He does not excuse our sin, but He covers it with His blood. He advocates for us on the basis of His finished work.
That is why we can have confidence before God. Not because we are sinless, but because Jesus is righteous. Not because we have performed perfectly, but because His sacrifice is enough.
This confidence changes the way we pray. John says that if we ask according to God’s will, He hears us. Prayer is not a desperate attempt to convince a reluctant God to care. Prayer is the conversation of loved sons and daughters with their Father.
We Pray for One Another
John also says that when we see a brother or sister caught in sin, we should pray. That is a deeply practical word for the church. We are not meant to ignore sin, gossip about sin, or stand at a distance in judgment. We are invited to intercede.
If someone is stuck, we pray for them. If someone is struggling, we ask God to give life, repentance, and restoration. And when we are the ones stuck in sin, we need others to pray for us.
This is one of the gifts of belonging to the body of Christ. We are not isolated individuals trying to survive spiritually on our own. We are family. We are brothers and sisters with the same Father, and God uses us to help one another walk in the light.
Set Free from Sin’s Control
John says that everyone born of God does not keep on sinning. That does not mean Christians never sin. John has already made clear that believers still need confession, forgiveness, and an advocate. What he means is that sin no longer has the final controlling power over those who belong to Jesus.
Christians still battle sin, but we are no longer slaves to it. The same resurrection power that raised Jesus from the dead is at work in us by the Holy Spirit. God gives us grace to see sin, hate sin, confess sin, and put sin to death.
John also says that Jesus protects His people, and the evil one does not touch them. Satan can tempt, accuse, discourage, and lie. But he cannot destroy those who belong to Christ. Jesus holds His people securely.
That is strong comfort for tired believers. Even when we feel weak, Jesus is not weak. Even when we feel vulnerable, Jesus is guarding us. Even when we feel defeated, the enemy is already defeated.
Keep Yourselves from Idols
John ends with a short and striking command: “Little children, keep yourselves from idols.”
At first, it may seem like an abrupt ending. But it makes sense. If eternal life is in the Son, then anything else we trust as ultimate life is an idol. If Jesus is the true God and eternal life, then every false source of security, identity, comfort, or salvation must be rejected.
An idol is not only a statue. It can be success, approval, control, comfort, family, money, reputation, or even religious performance. Anything we look to for the life only Jesus can give becomes spiritually dangerous.
So John ends by calling us back to the real Jesus. The true Son of God. The crucified and risen Savior. The one who gives eternal life. The one who hears us, keeps us, protects us, and brings us home.
The Invitation
This final passage in 1 John invites us to rest in what God has made known. Jesus Christ is the Son of God. He truly came. He truly died. He truly rose. He truly gives eternal life.
If you belong to Him, you do not have to live in fear. You can know that you have eternal life. You can pray with confidence. You can fight sin with hope. You can ask others to pray for you. You can resist idols because you already have the greatest treasure.
Whoever has the Son has life.
