The question of Colossians, which sparked the very writing of the letter, is whether or not Jesus is enough with many misbelieving, “No, you must make up the difference.”
Yet Paul has proclaimed that Christ is all in all. And this is the basis for his direction to not look to other things for our sufficiency. In this passage, we learn that we cannot trust in our own spiritual achievement, focusing on ourselves. Instead, we should consider and focus on Jesus. He is Supreme. And he is enough.
Therefore let no one pass judgment on you in questions of food and drink, or with regard to a festival or a new moon or a Sabbath. These are a shadow of the things to come, but the substance belongs to Christ. Let no one disqualify you, insisting on asceticism and worship of angels, going on in detail about visions, puffed up without reason by his sensuous mind, and not holding fast to the Head, from whom the whole body, nourished and knit together through its joints and ligaments, grows with a growth that is from God.
If with Christ you died to the elemental spirits of the world, why, as if you were still alive in the world, do you submit to regulations— “Do not handle, Do not taste, Do not touch” (referring to things that all perish as they are used)—according to human precepts and teachings? These have indeed an appearance of wisdom in promoting self-made religion and asceticism and severity to the body, but they are of no value in stopping the indulgence of the flesh.