1 John 1 is about the reality of Christ the Messiah , who came as "the Word of life" from the father, so that we might have fellowship with the Father and receive Him, who is our eternal life. Fellowship with Him means that we walk with Him in His light, but if we deny Him we can only walk in darkness. By denying Him, we deny His Word and therefore will not have the truth and give up the privilege of resting in the eternal life available in Christ. But, if we confess our sins , He is faithful and will forgive us and we can enter into fellowship with Him and with one another in the Body, and the blood of Jesus purifies us and He becomes our eternal life.