Walking in the light is necessary. It is essential. It is indispensable. It is the necessary way of fellowship. It is the only sphere in which fellowship is enjoyed. Yet we do not by our good works of obedience maintain fellowship. We cannot. The fellowship is maintained only through the grace of God. That is why John writes, “and the blood of Jesus Christ his Son cleanseth us from all sin.”
What, then, does a walk in the light look like? It is a life of faith and repentance, a life of obedience, a life of honoring God, a life of keeping God’s commandments, a life of devotion to God, a life of love for God and the neighbor, a life of prayer and Bible study. It is a life of faithfulness in marriage or in single life, a life of diligence in one’s calling, a life of obedience and honor for parents, and a life of faithful attendance at public worship.
Darkness is a figure. In the Bible darkness is not only the absence of light. We turn off the light, and it becomes dark. Darkness is more than absence. Darkness is the opposite of light, the antithesis of light, and the enemy of light. If light is purity and holiness, darkness is impurity, depravity, and the defilement of sin. If light is warmth, joy, gladness, and comfort, darkness is gloom, misery, and despair. If light is life and vitality, darkness is death. If light is truth and clarity, darkness is obscurity, confusion, and error. If light is glory, darkness is shame. Darkness engulfs, it oppresses, it obscures, it hides, it covers and conceals, and it destroys.
A man who walks in the light enjoys fellowship. He does not lie; he speaks, and he lives the truth. If we walk in the light, we enjoy fellowship: first, with God in Jesus Christ; and second, with other believers, who also walk in the light. Light is the sphere of blessedness, of communion, of fellowship, and of affinity. In the light God shares his life with us; in the light we delight in him; in the light we taste and see that he is good; in the light we experience his favor.
The fellowship in 1 John 1 is fellowship with God and, therefore, fellowship with fellow believers. Such fellowship is enjoyed through faith and in the church, where God is worshipped, confessed, loved, and obeyed. John begins in verse 3 with the message of the apostles, which is the message of the incarnation of the Son of God. The apostles (among them John) have seen, heard, and handled Jesus Christ. That message they declare unto you, the readers. That message we receive as we read it and as we hear it preached. The purpose of that declaration of Jesus Christ is “[so that] ye also may have fellowship with us [the apostles]” (v. 3). We have fellowship with the apostles by believing and receiving the gospel that they preached. Through faith in the apostolic message, and in no other message, we have fellowship also with God: “And truly our fellowship is with the Father, and with his Son Jesus Christ” (v. 3).