It organizes 4 Christian things that come in sets of two.
Really, the first three are all the same. The only correlates communion with the larger dual concept which I have broken down into three other things.
Past Ongoing/future
Justification/Salv Sanctification Needs of Man
Atonement/Just Adoption Work of God in us
Justice/guilt Relationship to God Justice functions
Body of Christ Blood of Christ Communion
God had a plan when he made the universe, so I bet he had a plan when he designed our salvation too.