As Paul nears the end of his letter to the Galatians, he begins to wrap up his thoughts expressed previously, with a big "therefore" to start chapter 5. The exhortation is centered on standing firm in the freedom which came to them through belief in Christ alone, while avoiding the temptation of doing something to make themselves acceptable to God.
They began their journey in the Spirit until some "bewitchers" came along to steer them into a mixture of the Mosaic law and grace. Paul reveals that attempting to be justified by law and works instead of faith working through love will send them in the opposite direction of grace. This is the good news gospel. If Paul had written and suggested that they need to do more to prove outwardly they are Christians—starting with circumcision and other works of the law—that would have been a burdensome epistle and quite a "different gospel."
Doing good, avoiding evil. Those four words would seem to be a no-brainer within almost every religious creed. And this seems to be the foundation upon which Christianity has been built, at least within many church denominations. So if this is supposed to be the goal for believers in Christ—if this is the primary purpose—what is it that makes our faith unique?
Paul spoke to the Galatian churches in frustration because after receiving the Spirit of God freely by faith, they had been persuaded to begin trusting in the works of the old law in addition to faith in Christ. Paul called this a work of the flesh. Its roots go back to the same tree Adam ate from when everything collapsed. It was called The Tree of the Knowledge of Good and Evil. It was an unbelief problem as Adam decided to turn from trusting in the sufficiency of the life of God … and chose to begin trusting in the knowledge of both good and evil. He was told it would make him more like God, but it had the opposite result.
Many believers today are struggling with the same thing. They are working at trying to become more like God, and it becomes more about doing—or not doing—instead of being or resting in who God has already made them to be.