How to Read the Book of 1 John (and Actually Understand It)
Matt · April 16, 2026
1 John is one of the most personally rich books in the entire Bible. Written by the apostle John near the end of his life, it's a warm, direct letter about what it looks like to truly know God — and it's only five chapters long.
What Is 1 John About?
At its core, 1 John is about assurance. John writes so his readers will know they have eternal life (1 John 5:13) — not wonder, not hope vaguely, but actually know. He lays out three recurring tests throughout the letter:
- The doctrinal test: Do you believe Jesus came in the flesh?
- The moral test: Are you walking in obedience, turning from sin?
- The social test: Do you love other believers genuinely?
These three themes spiral through the book repeatedly. John isn't being disorganized — he's driving these truths home with pastoral intensity, like a teacher who keeps circling back to the most important material.
How to Read It Well
Read it in one sitting first. 1 John takes about 15–20 minutes to read aloud. Before you slow down to study individual verses, read the whole letter straight through. You'll immediately feel the warmth and urgency of the writing — and you'll start to notice how the themes repeat.
Pay attention to the "we know" statements. John uses the phrase "we know" or "by this we know" at least a dozen times. Each one is an anchor — a confidence marker. When you see it, stop and ask: What exactly am I supposed to know here, and why does it matter?
Notice the contrast pairs. Light vs. darkness. Love vs. hate. Truth vs. lies. Children of God vs. children of the devil. John thinks in vivid contrasts, and recognizing them helps you follow his logic clearly.
Don't read 1:8–10 in isolation. The famous verse "if we confess our sins, he is faithful and just to forgive us" is often quoted alone — but read in context, John is addressing people who claimed to be sinless. The surrounding verses sharpen the meaning considerably.
A Simple Reading Plan for 1 John
If you want to slow down and spend a week with this letter, here's a natural breakdown:
- Day 1 — Read the full letter once (all 5 chapters)
- Day 2 — Chapter 1: Walking in the Light
- Day 3 — Chapter 2: Knowing God, Loving the World
- Day 4 — Chapter 3: Children of God
- Day 5 — Chapter 4: Testing the Spirits, The Nature of Love
- Day 6 — Chapter 5: Faith That Overcomes, Assurance
Apps like Bible In A Year, which build daily reading into a structured plan, are a great way to work through shorter letters like 1 John without losing momentum or skipping ahead.
Frequently Asked Questions
Who wrote 1 John and when?
Most scholars believe the apostle John — the same John who wrote the Gospel of John and Revelation — wrote this letter around 90–95 AD from Ephesus. The letter doesn't name its author, but the style, vocabulary, and themes closely match the Gospel of John.
Is 1 John hard to understand?
It's actually one of the more accessible New Testament books. The language is simple and direct. The challenge isn't vocabulary — it's sitting with the repeated questions John asks about your own heart. The depth is relational, not intellectual.
What's the key verse in 1 John?
Many point to 1 John 4:8 ("God is love") or 5:13 ("I write these things to you who believe in the name of the Son of God, that you may know that you have eternal life"). Both capture the heart of the letter well.