John is describing The Lord. Word of life. In 1:1-4 in the beginning was God. Jn. 1:14 Jesus was God in the flesh. Cols.2:8-9 Vs2 eternal life.. Without Jesus coming and dying for us, we would not have any fellowship with God. Communion with the God of the universe.Jn.3:16 Vs 4 writing that we may have complete joy. By product for our fellowship with Jesus. Eternal pleasure with Christ. Jn.5:13 fullness of joy. Vs.5. Light is Jesus, just and pure and no darkness. Vs.6 if you claim walk to walk with Jesus, but walk in darkness, then you are lying. Matt.7:21-23 Walk is a life style of our faith. If, we die to sin how can we live in sin. Vs.7. Walk in the light for he is in the light. Continual cleansing . 2Corth.13:5 Psa.51:12