The theme of the entire epistle to Colossians is the unique dominion of Christ in the terrestrial and celestial life. And the apostle Paul points out in this verse, we have just read, three reasons of this dominion: headship, firstborn and preeminence.
Let begin from the beginning - Preeminence. Christ has the right to be the chief, because He is Even the same that He said from the beginning (Jn 8:25). He is the One, by whom all things were made (Jn 1:3), that is why He knows all the ways.
Now about the firstborn. He is first in everything: the first in adoption, the first in righteousness, the first in self-abnegation, first in love, first in resurrection. He is Lord by right of precedence and because He is better!
And finally, the headship. The head - bearer of ideas and the thoughts, the head is most precious and necessary. That is surely why the head controls all the other organs of the body. And behold, in Christ the Creator is connected with His creation, a new humanity - the Church - it is a God-Man body, in which the control part (the head) belongs to God.
Thus, in Christ - the beginning, the way and the purpose of the entire universe, what the apostle Paul wanted to tell us, and, by being connected to Him {the Christ} by faith, we become partakers in the plenitude of His Man - God's life.
