The Security You're Looking For

Have you ever locked the front door, walked to your car, and then turned around to check the door again? Maybe you checked it twice. Maybe three times. The more anxious you feel, the more you check, and the more you check, the more the doubt grows. Something about the repetition itself starts to erode your confidence. You know you locked it. You heard the click. But knowing isn't enough. You need to feel it, to be certain beyond all shadow of uncertainty. And so you check again.

This is what the search for spiritual assurance looks like for many Christians. Not a settled peace, but a compulsive returning to the door, rattling the handle one more time, hoping that this time the certainty will stick.

The question of assurance has been a driving force in Christian theology for centuries. During the Reformation, the desire to give ordinary believers a sense of security before God was one of the great motivating impulses behind new theological frameworks. And that impulse was understandable. Medieval piety had, in many quarters, left people terrified of divine judgment, uncertain whether they had done enough, confessed enough, suffered enough. The Reformers wanted to set people free from that anxiety, and so they constructed theological systems designed to guarantee that freedom. If salvation is by grace alone through faith alone, and if God's sovereign election cannot be thwarted, then surely the anxious heart can rest.

But here is the irony that anyone who has spent time in those traditions will recognize: the people who hold most tightly to "once saved, always saved" theology are often the very ones who struggle most with knowing whether they are, in fact, saved. The theology promises certainty, but the heart remains restless. The door has been locked, but they keep going back to check.

Why?

Because assurance rooted in an idea is only as secure as the idea is correct.

And deep down, we all sense that. A theological system, no matter how elegant, is a human construction attempting to describe divine realities.

It can be helpful. It can be true in many respects. But how do I know it's true? Ultimately, if your "security" or certainty of salvation hinges on a particular theology, there's always a lingering question: what if I'm wrong?

But no "theology" about justification, or "eternal security," is, itself, the thing that holds you.

You cannot rest your full weight on a doctrine the way you can rest your full weight on a person.

 

A Person, Not a Proposition

This is the great shift that transforms the entire question. True assurance does not come from getting your theology of justification exactly right.

It comes from knowing the heart of Jesus.

Consider what Jesus himself says: "I am the good shepherd. I know my own and my own know me" (John 10:14, NRSV).

Notice the nature of the assurance he offers. It is not a contractual guarantee. It is not a logical syllogism.

It is relational.

"I know my own and my own know me."

The security is found in the knowing, in the intimacy, in the mutual recognition between the Shepherd and the sheep.

A few verses later, Jesus says, "My sheep hear my voice. I know them, and they follow me. I give them eternal life, and they will never perish. No one will snatch them out of my hand" (John 10:27–28). This is one of the most powerful assurance texts in all of Scripture, and it is worth noticing where the assurance is located. It is not in the sheep's ability to hold on. It's not in refined "sheep theology." It's not in getting one's doctrine about the sheep's standing before the shepherd correct.

It is in the Shepherd's hand.

It is in his knowing, his giving, his holding.

The security is grounded in who he is, not in whether we have figured out the right theological formula.

This is why the apostle Paul, when he writes his soaring declaration of confidence in Romans 8, does not end with a doctrine. He ends with a person. "For I am convinced that neither death, nor life, nor angels, nor rulers, nor things present, nor things to come, nor powers, nor height, nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord" (Romans 8:38–39). The unshakable reality is not a theory about predestination. It is the love of God in Christ Jesus. That love is what cannot be defeated. That love is where Paul rests.

 

Not All Wounds Are the Same

But if assurance is relational, then what about sin? Doesn't sin threaten the relationship? Doesn't every failure call the whole thing into question?

You've maybe heard that "all sins are the same" in God's sight. Strictly speaking, that's not true. Yes, every "sin" wounds us, it is enough to merit damnation on our part, but that doesn't mean every single sin automatically consigns us to hell.

Here is where we need to think carefully, because not all sins are created equal, and failing to make distinctions here is one of the things that keeps people trapped in spiritual anxiety.

Think about marriage. In any real marriage, there will be failures. Harsh words spoken in exhaustion. Forgetting something important. Being selfish with your time. These things are real sins against the other person. They cause strain.

They wound. But they do not end the marriage.

They are not the same as adultery or abandonment.

A couple works through the small failures precisely because the covenant holds, because the love is bigger than the offense.

Scripture itself makes this distinction. The apostle John writes, "If you see your brother or sister committing what is not a mortal sin, you will ask, and God will give life to such a one—to those whose sin is not mortal. There is sin that is mortal; I do not say that you should pray about that. All wrongdoing is sin, but there is sin that is not mortal" (1 John 5:16–17).

John clearly distinguishes between sins that are deadly to the spiritual life and sins that are not. This is not a minor aside.

There are sins of weakness. The sharp word you regretted immediately. The failure to pray when you meant to. The small act of selfishness you recognized and repented of before the day was over. These sins are real, and they matter, but they are the kinds of wounds that exist within a living, breathing relationship with God. They do not sever the bond. They call for honesty, for repentance, for growth, but they do not mean God has given you the boot.

And then there are sins of willful rebellion. The deliberate, clear-eyed choice to turn your back on God and walk the other direction. The sustained, unrepentant embrace of something you know to be deeply destructive. These are the sins that rupture a relationship, not because God stops loving you, but because you have effectively walked out the door.

The distinction matters because without it, every small failure becomes an existential crisis. Every sin feels like it might be the one that finally exhausts God's patience. And that is no way to live. That is the spiritual equivalent of checking the locked door over and over and over again.

 

What the Heart of Jesus Looks Like

If assurance is found in knowing the heart of Jesus, then we need to spend time looking at that heart. And what we find, again and again in the Gospels, is a heart that is staggeringly patient with weakness and fiercely opposed only to the prideful refusal to be loved.

Jesus does not condemn the woman caught in adultery (John 8:11). He does not reject Peter after Peter denies him three times (John 21:15–17). He does not turn away the tax collectors and sinners who come to eat with him (Luke 15:1–2). The people who draw his sharp rebuke are the ones who are confident they do not need mercy, the ones who have locked the door of their hearts and refuse to open it.

The parable of the prodigal son is not primarily a story about a wayward child.

It is a story about a father who runs.

Who sees his son "while he was still far off" and is "filled with compassion" (Luke 15:20).

The father does not wait for the son to finish his rehearsed speech. He does not demand a probationary period. He runs, embraces, and throws a party. That is the heart of Jesus. That is where your assurance lives.

 

Resting Instead of Checking

So what does this mean for your life today?

It means you can stop checking the door.

It means that when you sin out of weakness, you can go to God honestly, confess what you have done, receive his mercy, and move forward without spiraling into panic about whether you are still "in." You are in. You are in because he is holding you, not because you have managed to hold on to him.

It means that the energy you have spent trying to nail down the perfect theological framework for assurance can be redirected toward actually getting to know Jesus. Read the Gospels. Not to extract doctrines, but to see him. Watch how he treats people. Listen to how he speaks. Let his heart become familiar to you, the way a spouse's heart becomes familiar over years of shared life.

It means taking seriously the call to avoid grave sin, not merely out of terror, but out of love. You do not avoid adultery in a marriage because you are afraid of a contract being voided. You avoid it because you love your spouse and you treasure what you have together. The same is true with God. The call to holiness is not a threat. It is an invitation to protect something beautiful.

And it means that when the anxiety creeps back in, as it will, you do not answer it with a theological argument. You answer it with a name. Jesus. The one who knows his sheep. The one whose hand holds you. The one who, while you were still far off, ran to meet you.

That is your assurance. Not an idea. Not a doctrine about justification. A Person. And he is not going anywhere.