“So I boast in Christ Jesus about the things that pertain to God.”
Paul’s boasting did not center in his accomplishments, but in what God has wrought in Christ and “what Christ has accomplished” v. 23. Nor did he take credit for the work of others.
Boasting in Christ amounts to praise for what God has done. It requires divesting oneself of all self-importance. It recognizes that all is done “in the power of the Spirit of God” v. 24.