In the final part of Paul's letter to the Galatians, Paul addresses addresses religious people who do good works to put on a show.There is a difference between putting on a show and doing what Christ enables people to do. Paul says the only thing worthy of boasting about is the cross of the Lord Jesus Christ, which we are justified by (if we put our faith in Him). In response, our "good works" become an expression of genuine gratitude and thankfulness. That thankfulness translates into loyalty, and out of that loyalty, we are motivated to serve.