Galatians 6:14: "May I never boast, except in the ___ of our Lord Jesus Christ."

Answer: Cross

Paul will boast only in the cross of Christ, through which the world has been crucified to him, and he to the world.

“But as for me, may I never boast, except in the cross of our Lord Jesus Christ, through which the world has been crucified to me, and I to the world.”— Galatians 6:14 (BSB)