We Know the Truth
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.

