No Filter Faith

CTK Veritas • October 16, 2025

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Today we’re looking at 1 John 1:5–10—and I’ll also read 2:1–2. You can open your Bible or app there.

Last week we opened the letter and saw how John takes us straight to the heart of the Christian faith: Christianity is not an idea or a cute story; the Christian faith is a Person—Jesus Christ. John said, “That which we have heard, seen, and touched… we proclaim to you.” We called that sermon More Than a Message.


Today, in 1:5–10 (and 2:1–2), John invites us to live a no-filter faith.


1 John 1:5–10 (ESV)
“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 2:1–2 (ESV)
“My little children, I am writing these things to you so that you may not sin. 
But if anyone does sin, we have an advocate with the Father, Jesus Christ the righteous. He is the propitiation for our sins, and not for ours only but also for the sins of the whole world.”



Filters—and the God Who Needs None

Instagram once removed many of its built-in beauty filters. Of course, users still find ways to filter—through other apps or uploads. I have a friend who loves the filters; in real life she looks normal, but with the filter she looks like Thanos. (I told her so!)

It’s not just Instagram. Humanity has always had a filter problem. Since the fall, we’ve tried to make ourselves look better—before others and before God.


John writes: “God is light, and in him there is no darkness at all.” God uses no filter, needs no distortion, no added contrast. He is perfect light. And He invites us to walk in His light—to remove our filters.


1) God Is Real: “God Is Light” (v. 5)

John moves from experience (“we heard, saw, touched”) to confession (“this is the message”). What did the apostles learn from being with Jesus? God is light. John doesn’t say God has light or merely produces light; light is His essence.


He’s writing to Jews and Gentiles:


  • To the Greek mind, light implied knowledge.
  • To the Jewish mind, light meant holiness and truth.


So “God is light” declares: God knows all, is holy, and is truth itself. And remember last week’s point: that God walked among us—Jesus of Nazareth. When John says “God,” think Jesus.


God is not made of parts (“a little light here, a little truth there”). He is simple—fully and always Himself. As Calvin put it, “When Scripture calls God light, it means that in Him there is nothing but what is pure and right.”


Illustration: In a house we once moved into, a bulb kept flickering. Replacing the bulb didn’t help; the wiring in the outlet was loose. That’s our lives—bright for a while, then dim. We can’t fix our own wiring. Jesus can. He exposes and heals what’s loose in us so the light doesn’t keep flickering.


A no-filter life starts here: God defines reality. It’s His world; His rules. “In Him is no darkness at all.”


2) Faith Must Be Honest (v. 6)

“If we say we have fellowship with him while we walk in darkness, we lie and do not practice the truth.”

If God is light, then claiming fellowship while persisting (“walking”) in darkness is a lie. John uses the phrase “if we say” (vv. 6, 8, 10) to confront self-deception.


Many of us have known the right words while living the wrong way. I have. Knowing gospel vocabulary is not the same as walking in gospel light.


This doesn’t mean perfection. God’s light exposes us—like Adam and Eve, we want to hide. But a no-filter faith isn’t sinlessness; it’s honesty. Stop pretending you’re righteous in yourself. You cannot walk in God’s light by your own merit. You can walk there in Christ—by His merit.


3) Grace Is Active (v. 7)

“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.”

John admits the possibility—and shows the power behind it: the blood of Jesus. We keep walking (present tense) because His blood keeps cleansing. This is the difference between justification (once-for-all declaration: righteous) and sanctification (ongoing growth in holiness).


John is not being metaphorical about the blood. Christ’s substitutionary atonement actually saves. “Without the shedding of blood there is no forgiveness of sins” (Heb. 9:22). The Heidelberg Catechism (Q43) says our old self is crucified with Christ so “the evil desires of the flesh may no longer rule us.”


Also notice the order: walk in the light → fellowship with one another → cleansing known and enjoyed. Grace is not only personal; it is communal.


4) Forgiveness Is Possible (vv. 8–10; 2:1–2)

“If we say we have no sin, we deceive ourselves… If we confess our sins, he is faithful and just to forgive… and to cleanse us from all unrighteousness.”

Denying sin removes you from the truth; confessing sin brings forgiveness and cleansing. In God’s courtroom there is a Judge—but there is also an Advocate“Jesus Christ the righteous” (2:1). He is the propitiation—the wrath-bearing sacrifice—for our sins, and not for ours only but for people from the whole world. So go preach—no category of sinner is beyond His saving reach.


Confession, then, is not dangerous with God; it is safe. Exposure before men often leads to shame; exposure before God in Christ leads to healing. Don’t put on spiritual makeup to talk to God—He already knows you and invites you near.


As Luther wrote in Thesis 1, “When our Lord and Master Jesus Christ said, ‘Repent,’ he willed the entire life of believers to be one of repentance.”


Step Into the Light

Maybe you feel your life is heavily filtered—performing, hiding, unsure how to be real with God or people. Good news:Jesus won’t walk away. The One who said, “Let there be light,” shines to restore, not to humiliate. What is sinful in us needs destroying; we need redeeming. Come humbly—and confidently—through the blood of Jesus.


The safest place for a sinner is in the light of God, because there—and only there—forgiveness is certain.

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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). John grounds assurance not in a vibe but in a visible trajectory : obedience, love, repentance, truthfulness—imperfect yet unmistakable. Takeaways If someone watched your week, what “family” would they see? The question isn’t perfection but pattern . Not no sin, but no peace with sin . Assurance grows as likeness grows— not flawlessly, but genuinely . Conclusion: Assurance, Not Anxiety John isn’t handing you a grading rubric; he’s painting a portrait of new life . If you’re born of God, this is what happens— You take sin seriously (conviction), You trust Christ’s victory (confidence), You grow in righteousness (change), and Your identity becomes visible (clarity). Still feel slow? Still stumble? John would say: the struggle is evidence of life. Dead things don’t fight. The grief you feel over sin, the hunger for holiness, the pull toward righteousness—this is family resemblance emerging. Not sensing that life yet? John isn’t condemning you; he’s inviting you: Come to the One who takes away sin and destroys the devil’s works. Sonship isn’t earned by behaving better; it’s received by believing (John 1:12). Hope for CTK Veritas We are not defined by failures. We are not saved by performance. We are not kept by our strength. We are God’s children —born of His Spirit, kept by His grace, changed by His love. So we take sin seriously , trust Christ’s victory , grow in righteousness , and make our identity visible . Where God begins a work— He finishes it .
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