The Apostle John, reiterates the message he received from Jesus, that God is light. God is truth, perfectly holy and in Him there is no sin at all. Therefore, when someone is united to God by faith, brought into the family of God, their lives are lived in the light. Christians live lives that are conformed to God's will and character. To say you are a Christian and fail to conform to Jesus' Word and life, is to lie. Anyone who does not surrender all areas of their life to Jesus is not walking in the light and should not have any confidence they shall receive eternal life. BUT if we walk in the light, the blood of Jesus cleanses us.