Introduction — That You May Know

A Series Introduction

James comes right before this letter in our Library’s curriculum, and it is worth pausing a moment on what changes as we move from one to the other. James showed what grace looks like when it meets ordinary friction: trials, an unruly tongue, money, a quarrel that needs mending. It assumed a settled faith and asked what that faith does with its hands. 1 John steps back one layer further and asks the question underneath all of that: how does a believer know, really know, that they belong to God in the first place?

This is a short letter, five brief chapters, and it does not read like a legal brief or a tightly reasoned argument the way Romans or Ephesians does. It reads more like a father circling back, again and again, to the handful of things that matter most: love one another, believe rightly about who Jesus is, walk in the light, do not be surprised when the world does not know you. Scholars sometimes call this style “spiraling”: the letter returns to the same handful of tests for genuine faith from a slightly different angle each time, rather than building a single argument from a beginning to an end. Do not expect a straight line through these seven days so much as a slow circling toward the same center. That is not a weakness in the letter. It is closer to how a pastor actually talks to people he loves and is worried about.

Today’s Passage — An Overview of the Whole Letter

The letter never names its author, but its opening line gives itself away. “That which was from the beginning, which we have heard, which we have seen with our own eyes, which we have gazed upon and touched with our own hands—this is the Word of life” (1:1). Set that beside the opening of John’s Gospel: “In the beginning was the Word… the Word became flesh and made His dwelling among us” (John 1:1, 14). The echo is deliberate. From the earliest generations of the church (Irenaeus, writing in the late second century, recalled hearing this directly from Polycarp, who had himself heard John), this letter has been received as the work of the same John who wrote the Fourth Gospel: the apostle, the beloved disciple, by this point an old man, writing near the end of a long life spent with these words.

The audience is not named by city the way Paul names the Ephesians or the Philippians. Ancient testimony places the letter’s origin in Ephesus, written to congregations across the surrounding region of Asia Minor that John had shepherded for years. And these were congregations in crisis. A group that had once belonged to their fellowship had left, and left teaching something that struck at the very heart of the gospel: some version of the claim that Jesus had not truly come “in the flesh,” that his humanity was an appearance rather than a reality. This is the specific wound this letter exists to treat.

Unlike a Pauline letter, 1 John does not build one continuous case from a premise to a conclusion. It reads more like a series of tests a reader can hold up to their own life: Do I walk in the light or in darkness? Do I love other believers or merely say I do? Do I confess that Jesus Christ has come in the flesh? Nearly every test the letter offers serves the same aim, and John states that aim outright, near the letter’s close: “I have written these things to you who believe in the name of the Son of God, so that you may know that you have eternal life” (5:13). Whatever this letter is doing on any given page, it is doing that.

Original Language: Knowing and Abiding — the Letter’s Two Habits of Mind

Two Greek words recur through this letter almost the way pistis and erga held James together, or the way chara and koinōnia held Philippians.

The first is γινώσκω (ginōskō), pronounced ghin-OH-sko, Strong’s G1097: to know, not in the thin sense of holding a fact in your head, but in the fuller biblical sense of knowing by experience, the way a person knows someone they actually live alongside. This is the word beneath the letter’s own stated purpose in 5:13, and it names the very thing the letter keeps testing for: not a feeling of assurance, but a real, examinable knowledge that a life belongs to God.

The second is μένω (menō), pronounced MEH-no, Strong’s G3306: to abide, to remain, to stay put in a relationship rather than pass through it. John uses this word more than any other New Testament writer, and in this letter it becomes almost a technical term for the ongoing, continuing life a believer shares with the Father and the Son. Ginōskō names the assurance the letter tests for. Menō names the relationship that produces it. You will meet both words again and again over the days ahead; for today, simply meet them once, so they are not strangers when they return.

Historical & Cultural Context

Most scholars date this letter to the 90s AD, late in John’s long life, written from Ephesus to the churches he had shepherded across the region. By then, the apostolic generation was passing, and the church faced a new kind of threat: not persecution from outside, but division from within.

The crisis behind the letter has a name in modern scholarship: an early form of what would later develop into full Gnosticism, and in this letter’s specific shape, something close to docetism (from the Greek dokeō, “to seem”), the claim that Jesus only seemed to have a real physical body, that his suffering and death were an appearance rather than a true event in real flesh and blood. Some early forms of this error instead taught that “the Christ,” a divine power, temporarily indwelt the man Jesus and departed from him before the crucifixion, so that it was the man alone, not the divine Christ, who actually died. Both versions denied the same two things: a real incarnation and a real atoning death.

This was not an abstract debate for John’s original readers. If Jesus did not really take on flesh, then he did not really suffer for sin, and the atonement is an illusion. If the atonement is an illusion, there is no real forgiveness, no real hope of a bodily resurrection to look forward to, and no real love of God poured out in an actual sacrifice. That is why an aging apostle picked up his pen one more time. The stakes were not academic; they were the whole substance of the gospel.

Study Notes

A handful of threads run through the whole letter, worth naming now so you recognize them as they return.

• Tests for assurance, repeated from more than one angle. Righteous living, love for other believers, and right belief about Jesus’s person all surface more than once, sometimes together in the same paragraph. John is not moving through these once and setting them aside; he circles back to all three, because a real assurance has to hold up under more than one kind of scrutiny.
• Light and darkness as the letter’s opening image. “God is light, and there is no darkness in Him at all” (1:5) sets the terms for nearly everything that follows: to walk in the light is to walk in fellowship, honesty, and confession; to walk in darkness is to deceive yourself about your own condition.
• Family language. John addresses his readers again and again as “little children” and “beloved,” the voice of a pastor near the end of his life, still tender toward the people he has spent decades loving.
• A letter soaked in John’s Gospel. Nearly every major theme here (light, love, life, abiding, the world, the Father and the Son) is a theme you have already met if you have walked through John’s Gospel in this Library. This letter reads like a return visit to familiar country, seen now through the lens of a specific crisis.

The map of the letter

Six days remain, walking the letter’s tests roughly in the order John gives them.

• Day 2, 1 John 1:1–2:2: Fellowship, Light, and Confession. The eyewitness claim that opens the letter, walking in the light versus walking in darkness, and the confession of sin that keeps fellowship honest.
• Day 3, 1 John 2:3–17: Love Versus the World, and Keeping His Commands. Knowing Him tested by obedience, the old-and-new command to love, and the world’s passing desires set against the will of God that remains forever.
• Day 4, 1 John 2:18–29: Antichrists and Abiding. The secession that provoked the letter, the anointing that teaches every believer, and the call to abide so that His coming finds us unashamed.
• Day 5, 1 John 3: Children of God and Love in Action. The astonishing love that makes us children of God now, the sharp tension between “no one born of God will continue to sin” and the honest reality of ongoing struggle, and love shown in deed and truth, not only in word.
• Day 6, 1 John 4: Testing the Spirits, and God’s Own Nature as Love. How to test any spirit’s claims about Jesus, and the letter’s boldest claim of all: God is love, and love itself is defined by what He did at the cross, not by our own instincts about what love feels like.
• Day 7, 1 John 5: Overcoming the World, and the Letter’s Closing Assurances. Faith as the victory that overcomes the world, the testimony of the Spirit, the water, and the blood, and the letter’s final words of confident assurance for everyone who believes in the name of the Son of God.

The Thesis: 1 John 1:3 and 5:13

If this letter has a beating heart, it beats in two verses, one near its opening and one near its close.

Here is the first, stating why John writes at all:

"We proclaim to you what we have seen and heard, so that you also may have fellowship with us. And this fellowship of ours is with the Father and with His Son, Jesus Christ." 1 John 1:3 (BSB)

Fellowship, not merely information, is the goal. What the apostles saw and heard with their own eyes and hands, they proclaim so that others might share in it: a real, living fellowship with the Father and the Son, not an idea to agree with from a safe distance.

Here is the second, stating why John writes this particular way, testing after testing, page after page:

"I have written these things to you who believe in the name of the Son of God, so that you may know that you have eternal life." 1 John 5:13 (BSB)

Fellowship with God (1:3) is the goal. Assurance that you actually have it (5:13) is the reason John kept writing until he reached the end. This is the same aim as John’s Gospel, one step further down the road. There, John wrote “so that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in His name” (John 20:31): a Gospel calling a reader to believe. Here, John writes to reassure a believer that they already have the life the Gospel promised. The whole letter exists to move a reader from wondering to knowing.

Personal Application

1. If assurance were something you could actually test in your own life rather than only hope for from a distance, what would change about how you carry your faith day to day?
2. Where do you currently look for evidence that your faith is real: in a memory of a single decision made long ago, in a feeling, in how you treat the people closest to you, in something else? What would it mean to let this letter’s own tests, rather than your own instincts, be the measure?

Pray to Close

The truth to carry into this letter: God has not left you to guess at whether you belong to Him. He has given you tests you can actually apply, and He wants you to walk away from this letter not wondering, but knowing.

Ask: that the Holy Spirit would open these seven days with the same plain honesty He gave this letter to its first troubled readers.

Yield: whatever in you would rather keep assurance vague and untested than hold your own life up to the light this letter shines.

Ask again: for a confidence, by the end of this series, that is not wishful thinking but a real, examined knowledge that you belong to God.