Walking in the Light
John announces the central message received from Christ: God is light, wholly pure and without darkness. Because that is true, fellowship with God cannot be separated from moral reality. To claim fellowship while walking in darkness is to lie and refuse the truth in practice. By contrast, walking in the light produces real fellowship and ongoing cleansing through the blood of Jesus. The paragraph establishes that communion with God is inseparable from truth and holiness.
A5nd this is the message we have heard from Him and announce to you: God is light, and in Him there is no darkness at all. 6If we say we have fellowship with Him yet walk in the darkness, we lie and do not practice the truth. 7But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin.
John then addresses sin with equal directness. To deny having sin is not advanced spirituality but self-deception, because the truth does not dwell in those who make such a claim. The right response is confession, which meets the faithfulness and justice of God, who forgives sins and cleanses from all unrighteousness. To deny ever having sinned escalates the falsehood further by making God a liar. The paragraph shows that life in the light includes honest confession rather than denial.
8If we say we have no sin, we deceive ourselves, and the truth is not in us. 9If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. 10If we say we have not sinned, we make Him out to be a liar, and His word is not in us.