His headship of the Church is the truth that born-again members of His body will contend for, against all false teachers. We will own no other. As the Head He is:
Through His body He works out His purpose for all creation.
"The beginning". The Church began with Him - He is its source - He is first as the originator of the Church. As the "firstborn from the dead" He is victor over death - He tore the bars away, Jesus my Lord, and ensured His people's victory over the grave (1 Corinthians
15:20,23 ). He is Lord of all creation by divine right. He attained Lordship of the Church by the travail of His atoning death, even the death of the cross, and His triumphant resurrection (Romans 1:4 ).
As the Saviour of "the body" He has the right of pre-eminence - He becomes supreme in us by our personal surrender to Him as Lord and Saviour. In this act of appropriation of Saviour and Lord we conceded to Him the right of His purchased possession, and crown
Him Lord of all. He who is Lord of the Church will be owned by all creatures as Lord of lords and King of kings - every knee will bow and every tongue confess that Jesus Christ is Lord (Philippians 2:10-11 ).
Christ is indeed "God ... manifest in the flesh" (1 Timothy 3:16 KJV). Christ is unique and different because in Him dwells all God's fullness. This strong statement refutes the false claim that part divine fullness dwelt in Him, and that other saints, prophets, also had
a measure of this fullness. Even today there are religionists who would belittle the true Christ, granting Him a position equal to Krishna - Buddha, or Mohammed. The biblical Christian position is that Christ Jesus is truly God and is the only one who can claim to be the way,
the truth and the life. In His fullness rests the security of our salvation.
The price paid to reconcile us must never be forgotten, "the blood of His cross."
The word "alienated" Greek 'pallotrioo'
Hostility to God in the mind is manifested in open acts of evil deeds and unnatural rebellion. Examples, alas, are abundant from our own sinful past and in the lost around us. This description of our past serves to remind us that Jesus Christ stands supreme as the mighty
and only Saviour.
Our wonderful, present state as believers is that of the reconciled. That is, we have been restored to harmony with God. This is a fact positionally in Christ. It is now our joy to individually through the helping, indwelling Holy Spirit, to choose to bring daily life and attitude
into harmony experientially.
The emphasis upon "the body of His flesh through death" being the means of our being reconciled, is to oppose the idea of there being any possibility of any other means or assistance in the work of reconciliation. The actual, literal death of Jesus is the means God uses
to save us and make us holy.
When that day of presentation arrives it will be the culmination of Christ's redeeming work (Philippians 1:6; 1 Corinthians 1:6-9 ). Our prospect of perfection is beyond doubt, because He works in us and cannot fail and He is faithful - He will finally and completely
demonstrate His supremacy as the only and perfect Saviour
4.7. CHRIST'S SUPREMACY AS HEAD OF HIS CREATION
(Colossians 1:18)
Colossians 1:18 "And he is the head of the body, the church: ..."
Bishop Lightfoot points out "and He" is repeated from the preceding verse to emphasise the fact that "the Creator of the world is also the head of the Church."

the inspiration of the body 
the ruler of the body 
the controller of the body 
the director of the body 
the sustainer of the body
Colossians 1:18 "... who is the beginning, the firstborn from the dead; ..."
Colossians 1:18 "... that in all things he might have the preeminence. "
4.8. CHRIST'S SUPREMACY AS HAVING TOTALITY OF
DIVINE FULLNESS (Colossians 1:19)
Colossians 1:19 "For it pleased the Father that in him should all fulness dwell; "
4.9. CHRIST'S SUPREMACY AS RECONCILER OF ALL
THINGS (Colossians 1:20)
Colossians 1:20 "... by him to reconcile all things unto himself; ..."
This "does not mean that Christ by His death has saved all people. Scripture speaks of an eternal hell and makes clear that only believers are saved. When Adam and Eve sinned, not only was harmony between
God and man destroyed, but also disorder came into creation (Romans 8:10-22 ). So when Christ died on the cross, He made peace possible between God and man, and He restored in principle the harmony in the physical
world, though the full realisation of the latter will come only when Christ returns (Romans 8:2 )". NIV Study Notes
4.10. CHRIST'S SUPREMACY IN THE SALVATION OF
SINNERS (Colossians 1:21, 22)
4.10.1. OUR PAST IS DESCRIBED
Colossians 1:21 "And you, that were sometime alienated and enemies in your mind by wicked works, ..."
"Indicates a desperate state of utter separation and isolation, which in lost humanity's relationship with God, is also marked by hostility. It is our own evil which makes us hostile to, and which alienates us from
God". L.O Richards - The Bible Readers Companion - Victor Books
4.10.2. OUR PRESENT IS DESCRIBED
Colossians 1:21,22 "... yet now hath he reconciled 22 In the body of his flesh through death, ..."
4.10.3. OUR FUTURE IS DESCRIBED
Colossians 1:22 "... to present you holy, and blameless, and above reproach in His sight "