Proof of Life
If you’re visiting CTK Veritas—welcome! We’re glad you’re here.
We’ve been working through 1 John. Week one: the gospel is more than a message—it’s a Person, Jesus Christ. Week two: when His truth shines on us, God’s light exposes—not to shame us, but to cleanse us.
Today, John takes the next step: If God’s light has truly shined on us, what follows? Answer: obedience.
“By this we know…” — John repeats that phrase to give believers assurance markers.
Scripture: 1 John 2:3–11 (ESV)
“And by this we know that we have come to know him, if we keep his commandments. Whoever says ‘I know him’ but does not keep his commandments is a liar, and the truth is not in him, but whoever keeps his word, in him truly the love of God is perfected. By this we may know that we are in him: whoever says he abides in him ought to walk in the same way in which he walked.
Beloved, I am writing you no new commandment but an old commandment that you had from the beginning… At the same time, it is a new commandment, because the darkness is passing away and the true light is already shining.
Whoever says he is in the light and hates his brother is still in darkness. Whoever loves his brother abides in the light, and in him there is no cause for stumbling. But whoever hates his brother is in the darkness and walks in the darkness, and the darkness has blinded his eyes.”
1) Obedience Is the Evidence (vv. 3–5)
John’s “two-factor authentication” for Christian assurance is simple and searching:
- Claim: “I know Jesus.”
- Verification: “I keep His commandments.”
In John’s vocabulary, know is relational—like the Hebrew yada—an intimate, lived knowledge, not mere information. We are justified by faith alone, but that faith is never alone; it bears fruit in obedience.
This isn’t perfectionism. “The love of God is perfected” points to a maturing process. Real believers still sin, but sin no longer feels like home. The Spirit disturbs our comfort, draws us to repentance, and trains us to obey.
Quick check: Am I growing in obeying Jesus’ summary of the law—loving God and loving my neighbor?
2) Imitation Is the Mark (v. 6)
“Whoever says he abides in him ought to walk in the same way in which he walked.”
Christianity is not only avoiding what’s wrong; it’s resembling what is right—Christ Himself. We imitate His patterns: truth-telling, humility, mercy, faithfulness. Don’t just ask, “What would Jesus do?” Ask, “What will Jesus do in meright now?” The Spirit empowers Christlike reactions in real time.
3) Love Is the Light (vv. 7–8)
John calls love both old (Lev. 19:18) and new (John 13:34).
- Old: “Love your neighbor as yourself.”
- New: “Love as I have loved you.”
The standard and source are raised: Jesus’ own love becomes the measure. The true light is already shining—we’ve seen what love looks like in the cross. By the Spirit, that love becomes our new operating system.
4) Hate Is the Darkness (vv. 9–11)
John’s definition may surprise you: hate is not only active hostility; it can be indifference—the absence of love. Indifference keeps us in the shadows, blinds our eyes, and trips others.
Where love is present, John says, there’s no cause for stumbling. Love clears paths.
Putting It Together
- Assurance: “By this we know…” Obedience doesn’t earn salvation; it evidences it.
- Direction: Walk as Jesus walked—pattern your words and ways after Him.
- Community: Love is the family resemblance of those who abide in the light.
- Warning: Persistent indifference to brothers and sisters is darkness—confess it, and step back into the light
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