This week's passage says more about the Son of God--the image of the invisible God, the firstborn of all creation, before all things and in him all things hold together.
[Tangent: I'm reading from the NRSV in which all of this is laid out in prose. Other translations present this passage as a hymn. I suppose the difference would affect whether I read this as Paul's original ideas or Paul's reminding the Colossians of something of which they were quite aware.]
In any case, we who came after them may read these lines as references to the Trinity. I had, anyway. Then, today, I read what was to me a new idea in Ronald Allen & Clark Williamson's Preaching the Letters without Dismissing the Law:
An example of a wisdom hymn or saying in Judaism regarding Woman Wisdom read, "She is a reflection of eternal light, a spotless mirror of the working of God, and an image of his goodness" (Wisdom 7:26); and Wisdom herself claims, "Before the ages, in the beginning, he created me" (Sirach 24:9)...The church expressed its faith in the language of Israel's Scriptures.
According to Allen & Williamson, the term translated as "image" is in Greek, "eikon" connotes agency. Christ is the way that an invisible God can be disclosed to us. Further, as the firstborn, Christ "reveals not only God to us but humankind as well..." (15-21)
Back to the "in him all things hold together": the reconciliation came through the blood of his cross. We have been made holy and blameless and irreproachable (22).
Yet, we need to live up to the image that Christ provides for us. Paul adds "provided that you continue securely established and steadfast in the faith, without shifting from the hope promised by the gospel that you have heard...." (23).
Paul is writing to an ancient congregation reassuring them and warning them, and his words still apply to us. Our congregation have their origin in the gospel, we are living out the image of God in our communities, we are held together by Christ, and we also need to be reminded that if our congregation begins to neglect our faith's requirements, then we will inevitably start to dissolve. Shifting from Christ to anything else would change what we would do, what we would be capable of doing.