Passage
For all the fullness was pleased to dwell in him;
For all the fullness was pleased to dwell in him;
Colossians 1:17 He is before all things, and in him all things are held together.
Colossians 1:18 He is the head of the body, the assembly, who is the beginning, the firstborn from the dead; that in all things he might have the preeminence.
Colossians 1:19 For all the fullness was pleased to dwell in him;
Colossians 1:20 and through him to reconcile all things to himself, by him, whether things on the earth, or things in the heavens, having made peace through the blood of his cross.
Colossians 1:21 You, being in past times alienated and enemies in your mind in your evil deeds,
The verse centers on "fullness", "pleased", and "dwell". It is saying that the verse draws attention to "fullness" and "pleased", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 18's "He is the head of the body..." into verse 20's "and through him to reconcile all things...", so "fullness" and "pleased" belong inside that flow. In Colossians context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "fullness" and "pleased" with trust shaped by these words, not by a vague optimism outside the passage.