Christ is the supremacy of God eternal, invisible, God only wise, He is Creator of that which was before eternity; He is the head of the Body, the Church. He laid down his life on a cross and shed His blood for us. He is the firstborn of the dead.
“The Greek word “firstborn” implied two things: priority to all creations and sovereignty over all creation. In the first meaning we see the absolute pre-existence of the Logos. Since our Lord existed before all created things, He must be uncreated. Since He is uncreated, He is eternal. Since He is eternal, He is God. Since He is God, He cannot be one of the emanations from deity of which the Gnostic speaks…” [Kenneth Wuest]
It is because of Christ’s eternality we are to be grateful for when we have Christ we have all that is needed or wanted. He is the fullness of God in bodily form. The world would seek fullness in philosophy, rituals or traditions and why we must be on guard against false teachers who espouse false doctrine and in the end seek to lead us astray. We are to “tear down arguments and every arrogant obstacle that is raised up against the knowledge of God, and we take every thought captive to make it obey Christ.” We must model the Bereans who studied the scriptures to know if what was being taught was the truth.