1Jn 1:5 This is the message we have heard from him and declare to you: God is light, and there is absolutely no darkness in him.
Here he began with something he had heard from the Lord Jesus Christ whose Incarnation he had just referred to verses 1-2. The content of this “message,” as John expressed it, is that God is Light; in Him there is no darkness at all.
In describing God as Light, John was no doubt thinking of God as the Revealer of His holiness. As Light, God both exposes man’s sin and condemns it. If anyone walks in darkness, he is hiding from the truth which the Light reveals. The transition from darkness into Light is what brings about salvation.
