What Are You Really Trusting?

1 John 5:18–21

In a world full of competing voices, substitute saviors, and counterfeit promises, what are you really trusting?

As we come to the end of 1 John, the apostle John closes his letter with a challenge that is just as relevant today as it was nearly 2,000 years ago. Throughout the letter, John has focused on confidence—confidence in our salvation, confidence in prayer, confidence in God’s love, and confidence in the truth about Jesus.

Now he ends with three simple words: “We know.”

We Know We Are Secure

John begins by reminding believers that those who have been born of God do not continue in a lifestyle of willful, habitual sin.

This doesn’t mean Christians never struggle. It doesn’t mean believers never fail. John has already made that clear earlier in the letter. Rather, genuine salvation produces genuine transformation. New birth leads to new conduct.

As one scholar put it, “New conduct should follow from new birth.”

The Christian can honestly say, “I’m a child of God. Choosing sin isn’t who I am anymore.”

John then points us to the reason believers can have confidence:

“The one who is born of God keeps him, and the evil one does not touch him.”

Jesus Himself protects and preserves His people. That doesn’t mean Christians are immune from suffering, hardship, temptation, or spiritual attack. Jesus promised those things would come. What it does mean is that Satan cannot ultimately steal what Christ has secured.

The believer’s relationship with God is safe because it is guarded by Jesus Himself.

We Know Who We Belong To

John’s second statement is equally clear:

“We know that we are of God, and the whole world is under the sway of the evil one.”

John draws the same line Jesus drew throughout His ministry. There are ultimately two kingdoms, two allegiances, and two masters.

That idea can sound offensive in a culture that values endless options and personal truth. Yet John is not claiming Christians are morally superior. Christians are not better than anyone else.

They’re rescued.

John’s point is not that believers are impressive. His point is that God is powerful.

While the world remains trapped under the influence of sin and rebellion, God’s people belong to Him and are under His care.

We Know the Truth

John’s third statement centers on Jesus:

“And we know that the Son of God has come and has given us understanding so that we may know the true one.”

What a remarkable gift.

God didn’t leave humanity guessing. He didn’t leave us wandering through competing philosophies and conflicting claims about truth. He came to us in Jesus.

The Greek word John uses for “understanding” carries the idea of reasoning that leads to perception. Christianity is not blind faith. God has given us the ability to recognize and understand the truth revealed in Christ.

There are countless voices competing for our attention today. Every platform, influencer, ideology, and movement claims to possess truth.

John reminds us that truth is ultimately found in a Person.

Jesus came so that we may know the true God.

Jesus Is the True God

John then makes one of the most significant theological statements in the entire letter:

“We are in the true one—that is, in his Son, Jesus Christ. He is the true God and eternal life.”

Everything in Christianity rises or falls on this truth.

If Jesus is merely a teacher, prophet, or created being, then He cannot save us. If He is not God, the confidence John has spent five chapters building collapses.

But if Jesus truly is God in the flesh, then everything changes.

• His sacrifice is sufficient.

• His promises are trustworthy.

• His victory is complete.

• And eternal life is secure.

The earliest Christians understood this clearly.

Critics sometimes claim Jesus’ divinity was invented generations after the New Testament. History tells a different story.

The Romans frequently accused Christians of atheism—not because Christians rejected God, but because they refused to worship the gods of Rome and refused to acknowledge Caesar as divine. Their allegiance belonged to Jesus alone.

One of the clearest examples comes from Polycarp, a disciple of the apostle John himself.

When Roman authorities demanded that Polycarp curse Christ and acknowledge Caesar’s claims, he refused.

Instead, he responded with words that have echoed through church history:

“Eighty and six years have I served Him, and He has done me no wrong. How then can I blaspheme my King and my Savior?”

Polycarp understood what John was teaching.

The worship, loyalty, and devotion that belong to God belong to Jesus.

And he was willing to die rather than surrender that truth.

Guard Yourself from Idols

Then John ends the letter with a surprisingly simple command:

“Little children, guard yourselves from idols.”

It’s a short sentence, but it serves as the conclusion to everything John has written.

• Reject what is false.

• Cling to what is true.

An idol is not merely a carved statue. An idol is anything that becomes a substitute for God.

Anything that becomes your functional savior becomes your idol.

Consider these questions:

• Where do you turn when you’re afraid?

• Where do you run when you’re anxious?

• What gives you security?

• What gives you purpose?

Those questions often reveal what we trust most.

Many good things can become dangerous things when they take God’s place.

• Comfort.

• Approval.

• Money.

• Relationships.

• Politics.

• Nationalism.

• Success.

• Even a version of Jesus we have reshaped to fit our preferences.

John’s final question echoes through the centuries:

If Jesus is the true God and eternal life, why would we trust anything else?

Final Thoughts from 1 John

As we close this journey through 1 John, several themes stand out:

• Because Jesus is real, we can know the truth, walk in the light, love one another, and live with confidence.

• Because Jesus is God, He provides eternal life to everyone who comes to Him in faith.

• Because Jesus is our strength, we can overcome sin and resist Satan.

• Because Jesus is Lord, Christian community is marked by love, truth, accountability, prayer, and the power of the Holy Spirit.

Most importantly:

Don’t let anything take the place of Jesus.

John leaves us with a decision every generation must make:

Will you remain faithful to the life-giving, one true God, or will you settle for a cheap substitute?

That decision is yours to make.