Now I rejoice in what was suffered for you, and I fill up in my flesh what is still lacking in regard to Christ’s afflictions, for the sake of his body, which is the church.
My immediate feeling when I read this was “hasn’t Jesus suffered competely or “finished” with the penalty of sin. Then in the same second “can’t be”, Paul must mean something else. Funny but seconds later I thought the suffering that’s lacking is the identification stuff. We need to, at times that are in season, vicariously suffer for the sake of love for others and out of love for Him. Remember that He leads in the paths of rigtheousness for His name’s sake, not ours.