We Know the Truth

CTK Veritas • December 14, 2025

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We Know the Truth (1 John 5)

As we open 1 John chapter 5, we’re stepping into the final movement of a letter that is both deeply pastoral and deeply theological. John is writing to a church that has been shaken. False teachers have left the community, drawing others with them. They claimed spiritual insight but denied foundational truths about Jesus Christ.

The result was confusion. Uncertainty. Anxiety.

So John writes—not to confuse believers further, but to reassure them.

Throughout the letter, he gives three tests of authentic Christianity:

  • The moral test — Do you obey God’s commands?
  • The social test — Do you love God’s people?
  • The doctrinal test — Do you confess Jesus Christ rightly?

These themes—truth, love, and life—are woven through the letter again and again. John doesn’t move in a straight academic outline. He circles back like a pastor who knows his people need to hear the same truths more than once.

By the time we reach chapter 5, John is tying everything together. His goal is simple and bold:


“I write these things to you who believe in the name of the Son of God, that you may know that you have eternal life.” (1 John 5:13)

Not guess.
Not hope.

Know.

This final chapter is John’s call to certainty in a world of confusion.

Certainty in an Age of Doubt


In our cultural moment, certainty is often viewed with suspicion. Doubt is praised as humility. Confidence is mistaken for arrogance. Many Christians today speak of “deconstruction”—questioning beliefs, revisiting assumptions, sometimes walking away altogether.

Honest questions are not the enemy of faith. Christianity is not afraid of examination. But there is a danger when doubt becomes the destination instead of a doorway.

John offers a different posture: assurance.

Christian confidence does not rest in the strength of our grip on Jesus, but in the strength of His grip on us. And John wants believers to live from that assurance.

So as he closes the letter, he begins where everything begins: faith in Jesus Christ.

1. Faith in Jesus Christ (1 John 5:1–5)


John opens with a foundational claim:


“Everyone who believes that Jesus is the Christ has been born of God.”

Christianity is not moral self-improvement. It’s not joining a community. It’s not adopting a worldview.

It’s new birth.

To be a Christian is to be regenerated—to be made new by God. And that rebirth produces fruit. If you love the Father, you will love His children. Faith always overflows into love.

But John is careful. Love is not undefined sentiment. He grounds it in obedience:


“By this we know that we love the children of God, when we love God and obey his commandments.”

Obedience is not opposed to love; it is how love takes shape. And John adds a tender reassurance:


“His commandments are not burdensome.”

For the one born of God, obedience may be costly—but it is not crushing. God’s will becomes a joy, not a weight.

Then John makes a staggering declaration:


“Everyone who has been born of God overcomes the world.”

This world pressures us to redefine truth, soften holiness, and center the self. Yet John says the believer overcomes—not by strength, not by strategy, but by faith:


“This is the victory that has overcome the world—our faith.”

The victory is not in us. It’s in Christ. And because Christ has overcome the world, those united to Him share in that victory.

2. Belief in God’s Testimony (1 John 5:6–12)


John now explains why this faith is trustworthy. He appeals to 
testimony.

Jesus came “by water and blood”—a reference to His baptism and His crucifixion. Some false teachers wanted a Jesus of glory without suffering, divinity without flesh, spirituality without the cross.

John refuses that separation.

No blood, no gospel.

Jesus did not merely appear divine. He lived as a man, died in the flesh, and shed real blood for real sins. Remove the cross and you remove salvation.

And then John adds the final witness:


“The Spirit is the one who testifies, because the Spirit is the truth.”

God Himself bears witness—through history, through the cross, and through the Spirit who now dwells in believers.

John presses the issue:


“Whoever has the Son has life; whoever does not have the Son of God does not have life.”

There is no neutral ground. Eternal life is not found in spirituality, morality, or sincerity—it is found in the Son.

3. Confidence Before God (1 John 5:13–21)


John now states the purpose of the letter plainly:


“That you may know that you have eternal life.”

Assurance is not arrogance. It is trust in God’s promise.

This assurance reshapes prayer. John says we approach God with confidence—not demanding our will, but aligning with His:


“If we ask anything according to his will he hears us.”

Confidence also reshapes how we care for one another. When a brother or sister stumbles, John calls us not to withdraw, but to pray—to intercede, to seek restoration.

He reminds us again: believers do not make peace with sin. They may stumble, but they do not remain comfortable in rebellion. Why?


“He who was born of God protects him, and the evil one does not touch him.”

John is realistic about the world:


“The whole world lies in the power of the evil one.”

But believers belong elsewhere:


“We are from God.”

And then comes one of the clearest affirmations of Christ’s divinity in all of Scripture:


“Jesus Christ… He is the true God and eternal life.”

The letter ends abruptly with a final pastoral warning:


“Little children, keep yourselves from idols.”

Anything that replaces Christ as the source of life—security, identity, hope—is an idol. Even good things become deadly when they take His place.

Conclusion: Whoever Has the Son Has Life


John ends where he began—with 
life.

Not abstract life.
Not moral life.
Not religious life.

Life in the Son.


“Whoever has the Son has life.”

That is the dividing line.

If you have Christ, you have eternal life now—not later, not eventually. You are loved, kept, protected, and victorious in Him.

So Church, let us live as people who have the Son:

  • With truth in our minds
  • Love in our hearts
  • Faith in our steps

And let us guard our hearts carefully—because assurance does not remove the need for vigilance.

Christ is our life.
Christ is our victory.
Christ is our confidence.


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Unanswered text from someone you love : the inner nudge isn’t humiliation but a relational reminder . God’s conviction protects fellowship. Takeaways The test isn’t “Do you ever sin?” but “What does your heart do with sin?” Real believers confess , not excuse; step into the light , not hide. Feeling the weight of sin is a sign of spiritual life , not spiritual failure. 2) Those Born of God Trust God’s Victory (vv. 5–8) “He appeared to take away sins … The reason the Son of God appeared was to destroy the works of the devil .” John lifts our eyes from our battle to Christ’s finished work . Jesus didn’t come to help us “manage” sin—He came to remove it. The decisive blow has already landed (Col. 2:15; Heb. 2:14–15). We don’t fight for victory; we fight from victory. Takeaways After a fall, run to Christ, not away from Him. Confidence is rooted in the cross , not your streak. “Whoever practices righteousness is righteous, as He is righteous ” (v.7): your practice flows from His person. 3) Those Born of God Grow in Righteousness (v. 9) “No one born of God makes a practice of sinning, for God’s seed abides in him…” John isn’t preaching perfectionism. He’s describing direction . God plants His life in us, and life grows —slowly, steadily, often painfully, but really (Phil. 1:6; John 15). Takeaways Ask directional questions: Am I quicker to confess? More tender to God? Celebrate small sprouts of grace. Small growth is still real growth. Abiding (John 15) isn’t passive; it’s returning to Christ again and again. 4) Those Born of God Make Their Identity Visible (v. 10) “ By this it is evident who are the children of God… whoever does not practice righteousness is not of God, nor is the one who does not love his brother .” Identity doesn’t stay hidden. Fruit will be seen (Matt. 7:16). 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Key text — 1 John 3:1–3 (ESV) See what kind of love the Father has given to us, that we should be called children of God; and so we are . The reason why the world does not know us is that it did not know him. Beloved, we are God’s children now , and what we will be has not yet appeared; but we know that when he appears we shall be like him , because we shall see him as he is. And everyone who thus hopes in him purifies himself as he is pure. The Ache to Belong When I first read the opening chapters of Harry Potter, I felt that ache for the boy under the stairs. Harry is forgotten, unwanted, convinced the cupboard is all there is—until a letter arrives and tells him he belongs. He has a name, a place, a story. That longing to be known and claimed sits in every human heart. 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As the Reformed tradition puts it, union with Christ brings not only pardon but sonship . “The Son of God became the Son of Man, that the sons of men might become sons of God.”(attributed to early Christian reflection; beloved by Calvin) John also adds a sober line: “The world does not know us because it did not know Him.” Family resemblance brings cultural friction. If the world misunderstood the Father, it will often misread His children. Two images to hold: Courtroom: The judge’s gavel declares the adoption—your status changes. Living room: The Father’s voice at breakfast—your heart changes. The gospel gives both: justification in the courtroom, adoption in the living room. Live from that love. Takeaways Recover your wonder. Don’t just parse this love— behold it. Rest in belonging. “ And so we are ” means security now, not probation. Expect misunderstanding. Family likeness won’t always win applause. 2) We Are Not Yet Complete (v. 2 — Future Hope) “ We are God’s children now , and what we will be has not yet appeared ; but we know that when he appears we shall be like him , because we shall see him as he is .” Identity now; destiny not yet revealed. The Christian life stretches between assurance and anticipation . The heart of our hope is the appearing of Christ . Notice the order: seeing leads to becoming . Historic theology calls this the Beatific Vision —the unveiled sight of the risen Lord that transforms us fully into His likeness. Glorification isn’t a self-upgrade; it’s the completion of adoption . What is partial becomes whole; what is dim becomes face to face (1 Cor. 13:12). Live in confident hope. John doesn’t say “might”—he says “we shall be like Him.” Let mystery humble you. “ Has not yet appeared ” invites worship, not worry. Fix your gaze forward. Our hope is not a trend; it’s a Person who is coming. 3) We Are Being Made Pure (v. 3 — Present Pursuit) “And everyone who thus hopes in him purifies himself as he is pure.” Hope fuels holiness. John’s grammar matters: he doesn’t say “purify yourself to earn hope,” but “everyone who has this hope purifies himself.” The verb (hagnizei) is present, ongoing— a rhythm, not a one-off . Think window-washing : the sun outside is blazing, but grime on the glass dims the room. Sanctification is the Spirit cleaning the panes of our hearts so Christ’s light shines through . You don’t create the light; you keep the glass clear —repentance, faith, obedience, again and again. Reformed reflection: The Spirit who secured our adoption (v. 1) and guarantees our glorification (v. 2) is the same Spirit who sanctifies us now. Christ justifies no one He does not also sanctify. Holiness isn’t an elective for advanced Christians; it’s the normal fruit of union with Christ . Let hope shape choices. A vivid horizon makes compromise feel cheap. Practice repentance as a habit. Cleansing is daily , not just crisis-driven. Pursue purity together. John’s “everyone” assumes community . The Whole Arc in Three Verses Love given (past): “See what kind of love…” Hope guaranteed (future): “We shall be like him…” Purity pursued (present): “Everyone who thus hopes… purifies himself.” The Father’s love reached back before time. The Son’s appearing stretches beyond time. The Spirit’s work meets you in real time —today. Your life right now is the meeting place of eternity and grace .
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