1 John 1
Big idea: John opens as an eyewitness, not a theorist: the eternal life that was with the Father has been heard, seen, and touched, and is now proclaimed so the readers can share the same fellowship. He states the first summary truth about God — God is light — and draws its immediate ethical consequence: fellowship with God is incompatible with walking in darkness, but is possible for those who walk in the light and are cleansed by Jesus' blood. Against opponents who claimed to be beyond sin, he insists that honest confession, not denial, is the path to cleansing.
The prologue's 'that which was from the beginning' and 'the Word of life' set up the letter's christological test (chs. 2, 4): the life is a real person who came in the flesh. 'God is light' (1:5) launches the obedience test that ch. 2 develops, and the confession of sin (1:8–10) answers directly the perfectionist claim the antichrists were making.
1:1–4 — The Word of life we have seen
A dense, breathless prologue echoing John's Gospel. The subject is 'that which was from the beginning' — the eternal Word of life — but the emphasis falls on sensory contact: heard, seen with our eyes, looked upon, touched with our hands. The life was made manifest; the apostles witnessed it and now proclaim it, so that the readers may share their fellowship — a fellowship that is with the Father and the Son. The purpose: that joy may be complete.
1 That which was from the beginning, that which we have heard, that which we have seen with our eyes, that which we saw, and our hands touched, concerning the Word of life 2 (and the life was revealed, and we have seen, and testify, and declare to you the life, the eternal life, which was with the Father, and was revealed to us); 3 that which we have seen and heard we declare to you, that you also may have fellowship with us. Yes, and our fellowship is with the Father and with his Son, Jesus Christ. 4 And we write these things to you, that our joy may be fulfilled.
1:5–7 — God is light
The letter's first great declaration about God: God is light, with no darkness in him at all. From it John draws a sharp test of fellowship. To claim fellowship with God while walking in darkness is to lie; but to walk in the light, as God is in the light, produces both horizontal fellowship with one another and ongoing cleansing by the blood of Jesus his Son.
5 This is the message which we have heard from him and announce to you, that God is light, and in him is no darkness at all. 6 If we say that we have fellowship with him and walk in the darkness, we lie and don’t tell the truth. 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 Christ his Son cleanses us from all sin.
1:8–10 — Confessing our sin
Three parallel 'if we say' claims expose a perfectionism John rejects. To say we have no sin is self-deception, and the truth is not in us. The alternative is confession: if we confess our sins, God — faithful and just — forgives and cleanses. To say we have not sinned is worse still: it makes God a liar and shows his word is not in us.
8 If we say that we have no sin, we deceive ourselves, and the truth is not in us. 9 If we confess our sins, he is faithful and righteous to forgive us the sins and to cleanse us from all unrighteousness. 10 If we say that we haven’t sinned, we make him a liar, and his word is not in us.
Scripture text: World English Bible (public domain).