The words “flesh” and “blood” used here in John 6 of course point to the cross, where Jesus’ flesh will be broken and his blood will be spilled, Jesus associates the separation of his flesh and blood in his violent death on the cross as the moment when He will totally give his whole self for the life of the world.
Texts like this remind us that the center of the Christian faith is the death and resurrection of Christ. Christ is our Great High Priest who as our King is a warrior Priest. Our whole existence and being means nothing apart from the death of Christ for sinners such as us.
Apart from the death of Christ the only way to deal with sin is to deny it and the only way to deal with guilt is to pawn it off on every poor unsuspecting soul we come across.
Apart from the death of Christ, right and wrong are, at best, merely agreed upon subjective conventions. However with the death of Christ God’s law is vindicated and so God’s definition of right and wrong are honored and are anchored as the Universal standard of right and wrong for all men.
Apart from the death of Christ good and bad are determined by those who have the most and biggest guns. With the death of Christ good and bad have meaning that transcend men’s ability to have their way by force. With the death of Christ justice, as found in and defined by God’s good, is one day guaranteed, even if that day is the last day.
The death of Christ is the anchor of the universe and were it to ever go into eclipse — a certain impossibility — men would become the psychotic animals too many of them already are due to their defiance against God and His Christ. It is only the death, resurrection and ascension of Christ that provides for the flowering of a human flourishing that is resolved on finding joy and meaning in bringing glory to God.
The death and resurrection of Christ is and always shall remain the truth that vindicates God and insures the manishness of man.