Colossians 1 24
At this time, I am suffering on your behalf, but I am still happy. Christ himself suffered on behalf of his people, the church. Now, while I live in my human body, I also suffer. I continue to receive the pain that Christ received, so that it may be complete. In that way, I help the church, which is like Christ's own body.
Compare with other 3 random translations
NCV Colossians 1:24I am happy in my sufferings for you. There are things that Christ must still suffer through his body, the church. I am accepting, in my body, my part of these things that must be suffered.
NLT Colossians 1:24I am glad when I suffer for you in my body, for I am participating in the sufferings of Christ that continue for his body, the church.
NKJ Colossians 1:24I now rejoice in my sufferings for you, and fill up in my flesh what is lacking in the afflictions of Christ, for the sake of His body, which is the church,