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
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.
AMP Colossians 1:24[Even] now I rejoice in the midst of my sufferings on your behalf. And in my own person I am making up whatever is still lacking and remains to be completed [on our part] of Christ's afflictions, for the sake of His body, which is the church.
ERV Colossians 1:24I am happy in my sufferings for you. There is much that Christ must still suffer. And I gladly accept my part of those sufferings in my body for the good of his body, the church.