1 John 5:18-21 He Is the True God and Eternal Life

1 John 5:18-21

He Is the True God and Eternal Life

Introduction

We have reached the end of 1 John. The Apostle John has made his arguments, provided his reasoning, and now brings his letter to a close with three clear statements. We should not continue in sin because we are born of God. We know that we are from God and that He keeps us from the evil one. And we know this is true because of what Jesus has revealed to us.

John does not end his letter by leaving believers confused. He ends by reminding them what they know. He wants the church to have confidence. He wants those who believe in Jesus to understand what God has done for them. He wants them to know that their faith is not built on imagination, tradition, emotion, or human wisdom. Their belief is built upon Jesus of Nazareth, what He said, what He did, and the testimony of God that confirmed Him.

This final passage brings together many of the themes John has carried throughout the letter. New birth changes how we live. Believers belong to God, even while the world lies under the power of the evil one. The Son of God has come and has given us understanding. Jesus Christ is the true God and eternal life. Therefore, little children, keep yourselves from idols (1 John 5:18-21).

God Has Saved Us

John writes, “We know that everyone who has been born of God does not keep on sinning” (1 John 5:18). This statement has been debated within Christianity long before we got here. I am not trying to settle every part of that debate, but I do want to clearly express what John is saying to his readers and what we must hold on to. If we believe in Jesus, we should not continue in sin.

We need to understand where this begins. The person who is born again did not start in righteousness. They were not sinless or perfect in order to receive this gift. It was not deserved. It was not earned. It was not owed to them. It was an act of mercy, forgiveness, and grace.

That is where they were found. They were found in sin. They were called out of sin. And they were called out with the expectation that they would not remain there. Christ does not save sinners so that they can comfortably continue in the sin that enslaved them. He saves sinners and purifies them.

At the same time, John is not teaching that believers will reach sinless perfection in this life before the day of redemption. That would reduce the work of Christ to merely making perfection possible now, while ignoring the clear testimony of Scripture that our final perfection is tied to the resurrection. We are being sanctified now, but we still wait for the fullness of what has been promised.

So we hold both truths together. We were called out of sin by Christ. We are sustained and kept by Christ. And the enemy, who works to destroy and hinder the work of God, is overcome because of Christ.

This is why the ministry of Jesus is such good news. Jesus did not come looking for people who were already righteous. He came for sinners. When the Pharisees questioned why Jesus ate with tax collectors and sinners, Jesus answered, “Those who are well have no need of a physician, but those who are sick.” He then said, “I came not to call the righteous, but sinners” (Matthew 9:10-13).

That is the mercy of God. Jesus came for the sick. He came for the guilty. He came for those who had no righteousness of their own. He did not come to celebrate sin, but to save sinners from it.

Jesus also said that there is joy in heaven over one sinner who repents (Luke 15:7). Heaven does not rejoice over people pretending they never needed mercy. Heaven rejoices when sinners repent. Heaven rejoices when those who were lost are found. Heaven rejoices when those who were dead are made alive.

Paul says it plainly: “Christ Jesus came into the world to save sinners” (1 Timothy 1:15). That is not a small statement. That is the heart of the gospel. Jesus did not come to improve already good people. He came to save sinners.

And the One who saves sinners also keeps them. Jesus describes Himself as the good shepherd. The good shepherd lays down His life for the sheep. He does not flee when the wolf comes. He does not abandon the sheep when danger appears. He knows His own, and His own know Him (John 10:11-15).

This connects directly to John’s words in 1 John 5:18. The one born of God is protected. The evil one does not touch him. This does not mean the believer will never be tempted, attacked, or troubled. It means the evil one cannot finally possess, reclaim, or destroy those who belong to Christ.

Jesus makes this even clearer when He says, “My sheep hear my voice, and I know them, and they follow me.” He gives them eternal life. They will never perish. No one will snatch them out of His hand. No one can snatch them out of the Father’s hand. Jesus then says, “I and the Father are one” (John 10:24-30).

That is why believers can have confidence. We are not saved by our strength. We are not kept by our strength. We are saved by Christ and kept by Christ. The life we have is not fragile because it rests in the hands of the good shepherd.

This does not make sin acceptable. It makes sin inconsistent with who we now are. If we have been born of God, then we should not continue in sin as though nothing has changed. The grace that saves us also calls us out of the old life.

We Belong to God

John continues, “We know that we are from God, and the whole world lies in the power of the evil one” (1 John 5:19).

This is a statement of identity and contrast. Believers are from God. The world lies in the power of the evil one. John is not saying that the world is merely confused, broken, or struggling. He is saying something far more serious. The world lies under the power of the evil one.

That means the sinner’s condition is not merely weakness. It is bondage. The sinner is in bondage to death, and death is connected to the power of the evil one. Sin is used as a tool to keep a person there. Once in that condition, it appears that there is no hope of being freed. But the announcement of the kingdom declares something different. Sinners can be delivered from their condition because of the mercy of God, the work of Christ, and the gift of the Holy Spirit.

Those who reject Christ, who are not born of God, who are not in Christ, remain dead in their sins. There is no hope apart from Him, for how could there be? They do not believe the testimony God has made plain. They do not believe the promise of God. They do not accept that He has the power to accomplish what He has said.

That is why resurrection is not a side issue. Eternal life is not merely a longer version of this life. Eternal life begins now in Christ and is completed in resurrection. If there is no resurrection, then death still has the final word. If death has the final word, then what are we living for? Only temporary satisfaction that cannot last.

But Scripture does not give us that hopeless vision. God has been making His promise known from the beginning. The patriarchs received the promises. The prophets carried them forward. The Scriptures record them for our instruction, so that we may know and believe.

Paul himself stood trial because of this hope. He told King Agrippa that he was on trial because of his hope in the promise made by God to the fathers. He asked, “Why is it thought incredible by any of you that God raises the dead?” (Acts 26:6-11). Paul understood that the resurrection was not a strange addition to the faith. It was tied to the promise of God.

But Paul had not always believed this. He once opposed the name of Jesus of Nazareth. He persecuted those who followed Christ. He was convinced that he ought to oppose them. But then the risen Christ confronted him.

When Jesus appeared to Paul, He sent him to open the eyes of others, so that they might turn from darkness to light and from the power of Satan to God. He sent him to proclaim forgiveness of sins and a place among those sanctified by faith in Christ (Acts 26:14-18).

That is the movement John is describing. The world lies under the power of the evil one. But believers are from God. They have been brought out of darkness and into light. They have been brought from the power of Satan to God. They have received forgiveness of sins. They have been given a place among God’s people.

This is why believers do not need to live in fear. Hebrews says that Jesus shared in flesh and blood so that through death He could destroy the one who has the power of death, that is, the devil, and deliver those who through fear of death were subject to lifelong slavery (Hebrews 2:14-15).

That is a major part of John’s encouragement. We belong to God. We are no longer under the evil one. We are no longer held in lifelong slavery through the fear of death. Christ has entered death, overcome death, and secured resurrection life for His people.

Paul explains the same victory when he writes, “The sting of death is sin, and the power of sin is the law.” But he does not leave us there. He says, “But thanks be to God, who gives us the victory through our Lord Jesus Christ” (1 Corinthians 15:56-57).

So what has Christ done to remove the power of the devil?

He fulfilled the requirements of righteousness in the law and bore the consequences of its curse. He did not set the law aside. He did not ignore it or leave it unresolved. Instead, He drank the cup that was filled because of our violations, satisfying its demands and removing its power over those who are in Him.

This means Christians do not live as people with no hope. We do not belong to the evil one. We do not belong to death. We do not belong to the world. We belong to God.

The gospel may be veiled to those who are perishing. The god of this world may blind the minds of unbelievers to keep them from seeing the light of the gospel of the glory of Christ, who is the image of God. But God has shone in our hearts to give the light of the knowledge of the glory of God in the face of Jesus Christ (2 Corinthians 4:3-6).

That is why we can know. That is why we can believe. That is why we can have confidence. We do not know God because we figured Him out from below. We know Him because He has made Himself known from above.

God Has Made It Known in Christ

John then writes, “And we know that the Son of God has come and has given us understanding” (1 John 5:20).

This is the foundation of everything John has said. How do we know that we have been saved? How do we know that we belong to God? How do we know that eternal life is real? How do we know that resurrection is not wishful thinking? How do we know that the world is wrong and Christ is true?

Because the Son of God has come.

God has not left us guessing. He has not left us to build our faith on imagination. He has not left us to invent our own version of Him. He has made Himself known in Jesus Christ.

John says the Son has given us understanding “so that we may know him who is true.” This is not merely information. This is revelation. God has opened our eyes so that we may know Him truly. Not a false god. Not a vague god. Not a god shaped by our preferences. The true God.

Nothing in creation reveals Him with the clarity and fullness that Jesus does. Creation displays the wisdom, power, and glory of God, but creation does not reveal the fullness of His character as a person. God has chosen to make Himself known through His Son.

Hebrews says that long ago God spoke to the fathers by the prophets, but in these last days He has spoken to us by His Son. The Son is the radiance of the glory of God and the exact imprint of His nature (Hebrews 1:1-3).

That means Jesus is not merely one messenger among many. He is not merely one prophet in a long line of prophets. He is the final and full revelation of God. If we want to know who God is, we look to Christ.

Paul says that Jesus is the image of the invisible God. In Him all the fullness of God was pleased to dwell. Through Him, God reconciles all things to Himself, making peace by the blood of His cross (Colossians 1:15-20).

This matters because people often want God without Christ. They want spirituality without the cross. They want forgiveness without repentance. They want peace without reconciliation. They want eternal life without the One who is eternal life. But God has not made Himself known that way.

In Christ, the invisible God is made known. In Christ, the fullness of God dwells. In Christ, peace is made by the blood of His cross.

Paul warns the church not to be taken captive by philosophy and empty deceit, according to human tradition, according to the elemental spirits of the world, and not according to Christ. Why? Because “in him the whole fullness of deity dwells bodily” (Colossians 2:8-9).

That means every worldview, philosophy, religion, or spiritual claim must be tested by Christ. If it denies Christ, it is false. If it replaces Christ, it is dangerous. If it claims to give life apart from Christ, it is an idol.

John begins his Gospel by telling us that the Word was in the beginning, that the Word was with God, and that the Word was God. Then he tells us that the Word became flesh and dwelt among us, and that we have seen His glory, glory as of the only Son from the Father, full of grace and truth (John 1:1-14).

This is the wonder of the Christian faith. God did not remain distant. The Word became flesh. God made Himself known in the person of Jesus of Nazareth.

So we must ask plainly: Who else bears the exact imprint of God’s nature? Who else has the fullness of deity dwelling bodily? Who else reveals God in the flesh?

No one.

If it is not Jesus of Nazareth, then there is no true and lasting hope of knowing who God is.

Keep Yourselves From Idols

John ends with a final command: “Little children, keep yourselves from idols” (1 John 5:21).

At first, this may seem like a sudden ending. But it is not sudden at all. It is the logical conclusion of everything John has said.

If Jesus Christ is the true God and eternal life, then we must not look anywhere else for salvation, significance, worship, or life. If God has made Himself known in Christ, then every other ultimate trust is false. If Christ gives eternal life, then nothing dead can give us life.

That is why Psalm 115 is so fitting. The nations ask, “Where is their God?” But the psalm answers, “Our God is in the heavens; he does all that he pleases.” Then it describes the idols of the nations. They are silver and gold, the work of human hands. They have mouths, but do not speak. Eyes, but do not see. Ears, but do not hear. Hands, but do not feel. Feet, but do not walk. They do not make a sound in their throat. Then comes the warning: “Those who make them become like them; so do all who trust in them” (Psalm 115:1-8).

Idols are not alive. They do not speak truth. They do not see. They do not hear. They do not save. They cannot forgive sins. They cannot raise the dead. They cannot give eternal life.

And yet the human heart is constantly tempted to trust what cannot save.

An idol does not have to be a carved statue. It can be anything we look to for what only Christ can give. It can be a false idea of God. It can be a version of Jesus that refuses what Scripture says. It can be success, comfort, control, approval, family, politics, tradition, money, morality, reputation, or self expression. Anything that becomes our source of salvation, identity, significance, hope, or worship is functioning as an idol.

John’s warning is loving because idols destroy. They promise life but cannot give it. They promise security but cannot keep it. They promise significance but cannot sustain it. They promise freedom but leave people enslaved.

Christ is different.

Jesus is not dead. Jesus is not silent. Jesus is not powerless. Jesus is not the work of human hands. Jesus is the Son of God who has come. He has given us understanding. He has revealed the true God. He is the true God and eternal life.

Therefore, little children, keep yourselves from idols.

Conclusion

In October of 2025, we began walking through the letter of 1 John together. Now, in April of 2026, we have reached the end. This final passage does not leave the church uncertain. It leaves the church with confidence.

We know that everyone who has been born of God does not keep on sinning. We know that we are from God. We know that the whole world lies in the power of the evil one. We know that the Son of God has come and has given us understanding. We know Him who is true. We are in Him who is true, in His Son Jesus Christ.

Our belief is built upon Jesus of Nazareth, what He said, what He did, and the testimony of God that confirmed Him.

Sinners can have hope because Christ has come. Those born of God are not left in sin. Those who belong to God are not left under the evil one. Those who have eternal life do not need to fear death as though death has the final word. Eternal life begins now in Christ and will be fully experienced in resurrection.

So we do not go back to idols. We do not look somewhere else for salvation. We do not look somewhere else for significance. We do not look somewhere else for life. We do not give our worship to what is dead and powerless.

Jesus Christ is the true God and eternal life.

Little children, keep yourselves from idols.

Scripture References

Matthew 9:10-13
Jesus came not to call the righteous, but sinners.

Luke 15:7
Heaven rejoices over one sinner who repents.

1 Timothy 1:15
Christ Jesus came into the world to save sinners.

John 10:11-15
Jesus is the good shepherd who lays down His life for the sheep.

John 10:24-30
Christ gives eternal life and keeps His sheep secure.

Acts 26:6-11
Paul connects his hope to God’s promise and the resurrection.

Acts 26:14-18
The risen Christ sends Paul to proclaim forgiveness and deliverance from Satan’s power.

Hebrews 2:14-15
Christ destroys the one who has the power of death and frees His people from fear.

1 Corinthians 15:56-57
God gives victory over sin and death through Jesus Christ.

2 Corinthians 4:3-6
God gives the light of His glory in the face of Jesus Christ.

Hebrews 1:1-3
God has spoken finally through His Son, the exact imprint of His nature.

Colossians 1:15-20
Christ is the image of the invisible God, and all fullness dwells in Him.

Colossians 2:8-9
The fullness of deity dwells bodily in Christ.

John 1:1-14
The Word was God, became flesh, and revealed His glory.

Psalm 115:1-8
Idols are lifeless, and those who trust in them become like them.