A while back, I was at an event where the speaker paused mid-talk, looked out at the crowd, and said, “The Bible says that God is…” and waited. He wanted the crowd to fill in the blank out loud. Almost everyone I could hear answered the same way: “love.”
I said something different. Out loud. By myself. “God is light.”
It was a little awkward, honestly. But it got me thinking about how unanimous that answer was. The pastor hadn’t hinted at what he wanted people to say. There was no context that would’ve primed the room toward the “right” answer. People just went straight for the 1 John 4:8 answer: God is love. And that’s not wrong — it’s Scripture. But it made me wonder if we’ve been conditioned to reach for that answer and stop there, either because our culture wants a God who is only loving, or because the church hasn’t always painted the fuller picture of who God is. Probably both.
So this time, I want to sit with the minority answer from that event. God is light. Our text is 1 John 1:5–10, but before we get there, it’s worth slowing down on what it actually means that God is light.
The Light Has Dawned
Scripture doesn’t start this conversation in 1 John. Go back to Isaiah:
The people who walked in darkness have seen a great light; those who dwelt in a land of deep darkness, on them has light shone. — Isaiah 9:2
It’s a fitting place to start, since we so often reach for light as a symbol of hope — porch lights, string lights, candles lit against the dark. A light has dawned on those in darkness, and we need it. A world without light is a dead world. Light brings visibility and warmth. If the sun disappeared tomorrow, we’d be an ice cube within days. Light is necessary for life.
But Isaiah wasn’t talking about sunlight. The light he prophesied was spiritual light dawning on spiritual darkness, and that’s how most of Scripture uses the language of light and dark. Jesus picks up the same theme:
You are the light of the world. A city set on a hill cannot be hidden. – Matthew 5:14
We’re meant to be a people of light — our love for Jesus and for our neighbors as obvious as a city’s lights seen from miles away at night. That means there’s no such thing as a secret or undercover believer. Our faith should be so evident and so transforming that nobody mistakes who we belong to.
Jesus also said this about Himself:
I am the light of the world. Whoever follows me will not walk in darkness, but will have the light of life. – John 8:12
He’s the true light — “the true light, which gives light to everyone, was coming into the world.” And to the extent we let Him live through us, we become light too, the way Paul described it: “I have been crucified with Christ. It is no longer I who live, but Christ who lives in me.”
So Jesus is the light, and we’re the light insofar as the Holy Spirit lives through us.
What the Light Does
That’s who the light is. So what does the light *do*? In simple terms, it drives out darkness — but let’s dwell on this for a minute.
Start here: from the Lord’s perspective, there is no darkness.
Even the darkness is not dark to you; the night is bright as the day, for darkness is as light with you. — Psalm 139:12
David is saying that even if he tried to flee from God into the darkness, it would be pointless — darkness is as light to God. Light always illuminates its surroundings. There has never been a moment in the history of creation where darkness has quenched light. Wherever light shows up, darkness disappears. Every time.
And in driving out darkness, light reveals whatever was hidden in it. Light is a revealer. An uncoverer. An exposer. It strips away whatever we use to conceal ourselves. The author of Hebrews puts this in stark terms:
And no creature is hidden from his sight, but all are naked and exposed to the eyes of him to whom we must give account. — Hebrews 4:13
The light exposes us. It strips our excuses. It burns away our justifications. It leaves nothing covered — we stand in it naked, every flaw, every motive, every half-formed thought fully exposed.
That’s who the light is, and that’s what it does. Now we can turn to our passage and understand what it actually means to walk in it.
Walking Naked Before Him
This is the message we have heard from him and proclaim to you, that God is light, and in him is no darkness at all. If we say we have fellowship with him while we walk in darkness, we lie and do not practice the truth. But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin. If we say we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. If we say we have not sinned, we make him a liar, and his word is not in us. — 1 John 1:5–10
I don’t have a tidy list of points to walk through here — I just want to sit with these six verses and let the meaning of light we’ve already established do its work.
Verse five: God is light, and in him is no darkness at all. Not only is God the source of light — He *is* light. We could look at the light fixtures on a ceiling and note they emit light, but we wouldn’t say the fixtures themselves are light. Same with the sun and stars — they’re balls of hot gas that emit light because of their temperature, but they aren’t light itself.
God is different. He is both the source and the substance. And because of that, there is no darkness in Him at all — which means everything there is to know about Him is, in principle, unhidden. That doesn’t mean we can comprehend all of it. But He isn’t hiding who He is. This is part of what Paul means in 1 Corinthians 13: “For now we see in a mirror dimly, but then face to face. Now I know in part; then I shall know fully, even as I have been fully known.”
You might think of Deuteronomy 29:29 — “the secret things belong to the Lord our God, but the things that are revealed belong to us.” There are things God hasn’t revealed yet, but not because He’s withholding secrets from us. It’s because we’re not ready. Frankly, it would kill you to have everything revealed to you right now. But when we’re finally glorified, we’ll see Him face to face, and because there’s no darkness in Him, nothing will be held back. We’ll spend eternity having every question answered — including the ones we didn’t know to ask — and somehow still never exhaust the depths of who He is.
Fellowship Requires Honesty, Not Perfection
Next: If we say we have fellowship with him while we walk in darkness, we lie and do not practice the truth. By His nature, you cannot have real communion with someone who *is* light while you’re walking in darkness. John has actual hypocrisy in mind here — and hypocrisy gets misunderstood a lot.
Hypocrisy isn’t failing to practice what you preach. We all fail; that’s just being human. True hypocrisy is failing and *pretending you haven’t*. The word literally means “actor.” So claiming fellowship with God while walking in darkness makes you an actor — a lie, not truth practiced. John isn’t describing sinless perfection here. He’s saying that as the light reveals things in us, we don’t pretend nothing’s wrong. We confess. We repent. We practice the truth. The Father is looking for people who worship Him in spirit and in truth — and if you’re not doing that, you’re not practicing the truth.
Which brings us to: If we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin. This verse gets read as a warm, comforting line, but walking in the light as He is in the light means something much more costly. It means walking naked before Him — letting the light do what light does: reveal, uncover, expose. Walking in the light means being okay with being uncovered. Okay with your motives laid bare. Okay with the secrets of your heart being disclosed. It means you treasure closeness with Jesus more than you treasure your own dignity, and you’ll become undignified for His sake if that’s what it takes.
And that *is* what it takes. We become undignified so He can be glorified through us. Walking in the light isn’t a warm-fuzzy experience — it’s a humbling, self-abasing one.
Here’s the catch: until we’re willing to do that, we can’t walk in real fellowship with other believers either. You aren’t in a genuine Christian community with people unless you’re willing to humble yourself and walk in that same kind of nakedness with them. Walking in the light exposes you before the Father *and* before your brothers and sisters in Christ.
To be clear — we’re all still sinning, still in process in our sanctification, so it’s not always wise to broadcast everything to everyone. But when the time and the people are right, you hold nothing back that the Lord tells you to reveal. My wife knows everything about me — the appropriate person, told everything at the appropriate time. Moving outward from her, other people in my life know a great deal about me too. I’m willing to be exposed within my faith community because I know the Lord uses our weaknesses to glorify Himself. We should be ready and willing to lose all dignity for the sake of Christ and the advancement of His kingdom. That’s what happens when we walk in the light — and it’s why John immediately adds that the blood of Jesus cleanses us. If you’re not willing to be brought low in the light, it’s worth asking whether Jesus has actually saved you.
Humble yourself in the sight of the Lord, and he will lift you up. — James 4:10
Denying Sin Is Denying the Light
Verses 8 through 10 all circle the same idea:
If we say we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. If we say we have not sinned, we make him a liar, and his word is not in us.
Walking in the light will uncover sin. So to claim you have no sin actually reveals that you’re *not* walking in the light — because if you were, your sin would be visible.
Years ago, a friend and I were talking with someone at a coffee shop, someone we believed to be a strong believer — until this conversation. My friend brought up Hebrews 12:1, about laying aside the sin that clings so closely to us. The person looked at us, dead serious, and said, “I don’t have that.”
It was one of the more awkward moments I can remember. And these verses came to mind immediately. If that’s you — if you genuinely believe you don’t have sin — you’re being deceived, and you aren’t walking in the light. You’re the actor we already talked about. To be fair, it’s normal to look back over the last few days and not recall anything glaringly sinful. But if you’re walking in the light, you’ll readily admit that, even if nothing comes to mind, the last few days weren’t sinlessly perfect either. It’s the outright denial of sin’s presence that gives away that you’re not in the light.
Verse 9 trips people up because they assume John means daily sins stay unforgiven until confessed. That’s not it. In context, if you’re confessing your sins, you *are* walking in the light — the light is doing its job, revealing them to you, and you’ve already been forgiven. He cleanses you precisely because you’re forgiven, not in order to become forgiven.
Verse 10 goes a step further: denying sin makes God a liar. Not that we actually succeed in making Him one — but we’re calling Him one, since He’s already said, “For all have sinned and fallen short of the glory of God” (Romans 3:23). A few things follow from that: if we weren’t going to sin again after being saved, Jesus wouldn’t need to intercede for us. A great deal of the New Testament wouldn’t exist, since so many letters were written to correct sin in the church. And we wouldn’t need to think about accountability, reconciliation, or forgiveness at all.
Don’t pretend. Don’t be the actor. Don’t accuse the Lord of lying by denying you’re still sinning. John is direct about what’s at stake if you do: His word is not in you.
The Light Was Rejected — and Still Is
It’s worth coming back to where we started:
The people who walked in darkness have seen a great light; those who dwelt in a land of deep darkness, on them has light shone. — Isaiah 9:2
That’s good news. But it’s worth remembering that the light everyone was waiting for arrived, and it was rejected:
The true light, which gives light to everyone, was coming into the world. He was in the world, and the world was made through him, yet the world did not know him. He came to his own, and his own people did not receive him. — John 1:9–11
Why? Because the light revealed, uncovered, and laid bare the motives and the wickedness of the hearts of those who were expecting Him. Every time you light a candle against the dark, it’s worth remembering that the true Light made everyone uncomfortable. Even as an infant, He made kings afraid.
Walking in the light is both dreadful and glorious — frightening and transforming, at the same time. It’s the light that drove kings, priests, and rulers to murder. The light that blinded men in their arrogance. The light that reveals and uncovers every ugly thing in our lives. And that’s exactly what it does: it either drives people further into darkness, or it brings repentance and healing as it shows us what needs to be redeemed.
And this is the judgment: the light has come into the world, and people loved the darkness rather than the light because their works were evil. For everyone who does wicked things hates the light and does not come to the light, lest his works should be exposed. But whoever does what is true comes to the light, so that it may be clearly seen that his works have been carried out in God. — John 3:19–21
Let me end with this simple question. Are you shrinking away further into darkness to avoid the light, or are you purposely trying to walk, naked and exposed, in the light of Christ? The answer to that question could have eternal consequences. Seek Jesus, let His light reveal darkness, repent, and walk in the light of His fellowship.
