Apostle John’s Three Letters . . . 1 John 1:1–4

    Fellowship with God and Jesus

Ready to hear a firsthand witness introduce us to the One who was “from the beginning”? John doesn’t begin with a list of rules or a debate; he begins with Jesus — the One he’d heard, seen, and touched. Christianity isn’t merely a new set of rules or a philosophical theory. It’s the historical meeting of eternity and time in the incarnate Son of God. In these opening verses, John invites believers into the shared life and joy that flow from fellowship with the Father and His Son.

First John opens with the subject that shapes the whole letter: fellowship with God. As we read and meditate on 1:1–4, notice that John speaks not merely as a teacher but as an eyewitness of Jesus Christ. Near the end of his life, he writes with the authority of one who’d personally heard, seen, and touched the incarnate Son of God. With the pastoral affection later expressed in the words “my dear children” (2:1), John writes to believers facing false teaching and calls them into genuine fellowship with the Father and with his Son, Jesus Christ.

So what’s John telling us in vv. 1–4? In vv. 1–2, he testifies to Jesus as the eternal “Word of life,” whom the apostles personally encountered. In v. 3, he explains why he proclaims this message: so that his readers may share fellowship with the apostles, the Father, and the Son. Then, in v. 4, he names the fruit of that fellowship: complete joy. John’s style may feel less like a tightly ordered argument than Paul’s letters; throughout 1 John, he returns repeatedly to major Christian themes, each time deepening their meaning for belief and daily life.

John Gives His Believing Friends — and Us — Three Tests

John closes his opening four verses by saying, “We write this to make our joy complete” (1 John 1:4, NIV). Some manuscripts read “your joy,” but either reading points to the full joy believers share through fellowship with the Father and his Son.

John wrote to brothers and sisters living amid confusion about truth, holy living, and relationships within the church. Before we move more deeply into vv. 1&nd4, it will help to see three recurring tests in this letter — three ways John helps believers recognize the marks of genuine faith and enjoy assurance in Christ.

Test #1: What Do We Believe?  One struggle involved doctrine — especially the identity of Jesus. Some people associated with the Ephesian churches denied that the eternal Son had truly become human. (See more about the Docetists in our introductory summary): They treated physical matter as inferior or evil, and therefore rejected the real incarnation of Jesus. John answers such error by pointing to the One whom the apostles had personally heard, seen, and touched: Jesus Christ, who came in the flesh.

So here are two questions for each of us: Is the Jesus you know and trust the Jesus revealed in Scripture? Do you believe he’s the Father’s Son, fully God and fully human, who came among us and died to redeem us from sin?

Test #2: How Do We Live?  John also makes clear that obedience isn’t an optional addition to Christian faith. It’s important to distinguish between two graces of the gospel: justification and sanctification. American Presbyterian A. A. Hodge (1823–1886), makes this distinction between the two. Justification is God’s once-for-all declaration that a sinner is righteous through the saving work of Jesus. Sanctification is his ongoing work of changing his children’s minds, desires, actions, and affections through the Holy Spirit. These graces are distinct, yet they always belong together in the life of a genuine believer.

None of us obeys perfectly, and John doesn’t ask us to pretend otherwise. The question is whether there’s a real and continuing desire to obey God, accompanied by repentance when we fail. Can you see a growing, sincere pattern of obedience to God’s commands in your life?

Test #3: Whom Do We Love?  Love is another repeated theme throughout 1 John: God’s love for us and the love his children are called to show one another. John writes that a claim to love God can’t be separated from practical love for a brother or sister. His point is searching but clear: Love for the unseen God is expressed through how we treat the people he’s placed before us.

Rather than beginning by asking whether someone else has been loving, let’s ask ourselves: Do we love our brothers and sisters in Christ? Is there resentment, contempt, or unforgiveness toward someone that needs to be brought honestly before the Lord?

These three tests aren’t meant to make us self-righteous or hopeless. They’re meant to turn us toward Christ, strengthen assurance, and expose places where repentance and growth are needed. First John is a letter about life, light, truth, and love: life with assurance, light in darkness, truth amid error, and love in a loveless world. With those three tests in mind, let’s inspect John’s opening testimony in vv. 1–4. Before he develops the tests of belief, obedience, and love, John begins with the foundational truth: Jesus Christ is the eternal Son of God who truly came in the flesh.

Fellowship through the Incarnation of the Word of Life (1 John 1:1–4)

John’s proclamation of “the Word of life” is important because it grounds the Christian message in eyewitness reality — not speculation, rumor, or religious theory. John and the other apostles had heard Jesus, seen him with their own eyes, studied him closely, and touched him. Their message was historically rooted and personally verified.

John begins, “That which was from the beginning.” He’s speaking of the Lord Jesus Christ, the eternal Son who truly became human. In John’s gospel, the apostle opens with the same great truth: “the Word was with God, the Word was God,” and then “the Word became flesh and made his dwelling among us” (John 1:1, 14). John isn’t offering a distant theological idea. Instead he’s lovingly directing his believing friends to the real Jesus — the eternal One whom he and the other apostles personally knew.

John’s eyewitness testimony directly answers teachings that denied either Jesus’ true humanity or his full divinity. Some claimed that Jesus only appeared to be human; others reduced him to no more than a remarkable human teacher. John won’t allow either error. His testimony is personal and unmistakable: He’d heard Jesus, seen him, looked upon him carefully, and touched him. The One who was “from the beginning” truly entered our world in flesh and blood.

“The Word of Life” in v. 1 speaks of Jesus as he was seen and known in his human life on earth. John hadn’t merely heard reports about him. He and the other apostles had looked closely at Jesus and had even touched him. Those words describe careful, personal observation. The eternal One — the One who was “from the beginning” — came into our world, and John experienced life with him firsthand. As one of the three disciples closest to Jesus during his earthly ministry, John had a uniquely personal witness to share.

John confirms that Jesus existed eternally “from the beginning,” yet was also physically present with him and the other eyewitnesses. Calling Jesus “the Word of life” should take us back to John’s gospel and its opening words about the Greek “Logos” or “Word.” John identifies Jesus as the One who was with God in the beginning and who is God. Through him all things were made, and in him is life. So, in both his gospel and this first letter, John presents Jesus as eternal, fully divine, the Creator of all things, and the true source of life.

In vv. 1–2, John repeats words such as “heard,” “seen,” “looked at,” “touched,” to emphasize that his witness was real. He wasn’t sharing an idea he’d imagined or a story he’d heard from someone. He and the other apostles had personally encountered Jesus Christ. John wanted his readers to know that eternal life had appeared in the real, flesh-and-blood person of Jesus. That’s why he calls him “the Word of life.”

In v. 3, John invites his readers, then and now, into a personal and lasting relationship with Jesus, the Word of life. He writes, “Our fellowship is with the Father and with his Son, Jesus Christ.” Through the apostles’ proclamation, believers are brought into fellowship not only with one another, but also with God himself. Acts 2:42–47 gives us a helpful picture of that kind of shared life among God’s people.

Verse 4 explains why John is writing: “We write this to make our joy complete.” This joy grows as we know the real Jesus, enjoy fellowship with the Father and the Son, and welcome others into that same fellowship. John is showing us that Christian joy isn’t shallow happiness; it’s the deep and lasting joy that comes from sharing life with God and his people.

This kind of “brotherhood” is a precious gift from our gracious, generous, and loving God. He alone is the giver and sustainer of life. John was concerned because some people in the local church community had altered the truth about Jesus. When the message about Christ is changed or compromised, it no longer faithfully proclaims the genuine “Word of life.” And when people reject the true Christ, genuine fellowship with God and his people is affected. Christian fellowship rests on a shared faith in the real Jesus that John proclaims.

We may use the word fellowship so often in church that we miss its depth. Biblical fellowship is much more than friendly conversation or simply spending time together. It’s a shared relationship with God and with fellow believers who’ve received new life through Christ. The Greek word koinonia speaks of participation and sharing in something held in common. It includes sharing spiritual life, helping meet one another’s needs, and accepting our responsibilities toward one another as members of God’s family. Acts 2:42; 1 Corinthians 1:9; 2 Cor. 8:4; Galatians 2:9; and 1 John 1:6–7 offer helpful pictures of this shared life. See also Dietrich Bonhoeffer’s reflection of “Christian community.”

At the heart of this shared life is knowing God through his Son. Through the good news John proclaims in vv. 1–2, we’re invited into fellowship with the Father, his Son Jesus Christ, and one another in v. 3. That fellowship, in turn, leads to the complete joy John speaks of in v. 4. We don’t create this fellowship for ourselves; we receive it as God’s gift. We then live it out together in his family.

Two important notes are worth keeping in mind. First, eternal life flows from a relationship with God through Christ, made possible by the Holy Spirit. Second, fellowship with the Father and his Son doesn’t begin only when we arrive in heaven. Through faith in Christ, we can know and enjoy fellowship with God today. In the midst of life’s stormy chapters, that relationship brings real assurance, peace, and joy.

Verses 1–3 lead naturally to v. 4. John has proclaimed that Jesus — the eternal life — appeared in human history. Through believing that good news, we’re brought into koinonia: a shared fellowship with the Father, his Son Jesus Christ, and one another. That fellowship leads to the complete joy John describes in v. 4. It’s not manufactured by our own effort; it grows as we know Christ, trust his Word, and share life with God’s people.

Finally, John tells us the purpose of his writing: “We write this to make our joy complete” (v. 4). His words echo Jesus’ teaching to his disciples: “I have told you this so that my joy may be in you and that your joy may be complete” (John 15:11). Christianity isn’t simply fellowship; it’s fellowship that grows into full joy. As we come to know Jesus more clearly and enjoy fellowship with the Father, the Son, and one another, God gives us a deep and lasting joy — one that can overflow into the lives of others.

† Summary and Key Points of 1 John 1:1–4

This four-verse passage opens with John’s eyewitness testimony about Jesus: the eternal “Word of life,” whom the apostles had heard, seen, and touched. John proclaims that the life which was with the Father appeared to them. His purpose isn’t only to establish the truth about Jesus, but also to bring his readers into fellowship with the apostles, the Father, and the Son — and into complete joy.

•  Jesus is the eternal Word of life. John presents Christ as the One “from the beginning,” emphasizing his eternal existence and his life-giving significance (1 John 1:1–2).

•  The gospel is eyewitness truth. John stresses what he and the other apostles had heard, seen, looked at, and touched, grounding the message in real historical encounters with Jesus (vv. 1–3).

•  Christ was revealed to human witnesses. The eternal life that was with the Father appeared to the apostles, showing that God has made himself known through Jesus (v. 2).

•  The apostolic message is proclaimed to others. John declares what he and the other apostles had seen and heard, emphasizing the trustworthy authority of their witness (v. 3).

•  Fellowship is John’s purpose. The message is proclaimed so that believers may share fellowship with the apostles — and, through that shared faith, with the Father and his Son, Jesus Christ (v. 3).

•  Fellowship leads to complete joy. John writes, “We write this to make our joy complete,” linking true fellowship with deep and lasting spiritual joy (v. 4).

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