1 John 5:6 "This is he who came by water and blood—Jesus Christ; not by the water only but by the water and the blood. And the Spirit is the one who testifies, because the Spirit is the truth." Living the life of a Christian is to be living in Christ. Human's are made of blood, water and spirit. The Holy Spirit is God's spirit living in us. Life in the Spirit is only possible because of Jesus Christ. Sin seperated our blood, water and spirit. The life we are born with is incapable of even knowing God. Oh how many today try to make their dead spirit into a life that models Christ without his Spirit. They are left trying to be good. They expect God to reward them by making a mockery of the cross. When Jesus died on the cross the blood, water and Spirit testify because they were all fully God. It's his Holy blood that paid the price. It was shed once only to bring back his own. This is why John was so concerned about false teachers denying the humanity of Jesus. Sinful blood could not redeem sinful man. Jesus never sinned. Now as Christians we can live in his Spirit by his Spirit. Anyone who denies the flesh is the spirit of antichrist because it keeps one from Christ. This is key to our faith. Jesus can not die again and his blood can not be recreated. The door is open because Jesus opened it. We by faith walk through with His blood covering us. Jesus did it all. Satan knows that blood forgives sin.