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.

 1:6-7 If we say that we have fellowship with him and at the same time walk in darkness, we lie and are not doing the truth. But if we walk in the light, as he is in the light, we have fellowship with each other and the blood of Jesus Christ is steadily cleansing us from all sin. 