Passage
Now, I rejoice in sufferings for you, and I fill up that which is behind of the tribulations of Christ in my flesh, for his body, which is the assembly;
Now, I rejoice in sufferings for you, and I fill up that which is behind of the tribulations of Christ in my flesh, for his body, which is the assembly;
Colossians 1:22 in the body of his flesh through death; to present you holy and unblamable and irreproachable before it,
Colossians 1:23 if indeed ye abide in the faith founded and firm, and not moved away from the hope of the glad tidings, which ye have heard, which have been proclaimed in the whole creation which [is] under heaven, of which *I* Paul became minister.
Colossians 1:24 Now, I rejoice in sufferings for you, and I fill up that which is behind of the tribulations of Christ in my flesh, for his body, which is the assembly;
Colossians 1:25 of which *I* became minister, according to the dispensation of God which [is] given me towards you to complete the word of God,
Colossians 1:26 the mystery which [has been] hidden from ages and from generations, but has now been made manifest to his saints;
The verse centers on "rejoice", "sufferings", "fill", "behind", "tribulations", "christ", "flesh", and "body". It is saying that the verse draws attention to "rejoice" and "sufferings", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 23's "if indeed ye abide in the faith..." into verse 25's "of which I became minister according to...", so "rejoice" and "sufferings" 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 "rejoice" and "sufferings" with trust shaped by these words, not by a vague optimism outside the passage.