The apostles of Jesus conveyed Jesus' teachings to the world. John has captured key teachings of Jesus in his Gospel. Chapter 8 shows that, for a life that does not end with dying in your sin, the thing is to be sure in your own heart that Jesus (The Son of Man) existed for the ages before He came and was with God who always planned for Jesus to be made completely human; then to realise too that He is going to be around forever and still human but resurrected. Why so important? So you have assurance He will be there for you eternally to transform you into the kind of person who is enough like God that God always keeps you in His household and treats you as a son, punishing sin but never destroying completely and never forsaking. Then carrying Jesus' teachings close to your heart until He replaces what is not of God with what is - and you do too in partnership with Him.
