Paul begins with a declaration: for freedom Christ has set us free, so we must stand firm and not submit again to a yoke of slavery. He warns that anyone who is circumcised to seek righteousness through the law is obligated to keep all of it, is severed from Christ and has fallen away from grace. Believers, by contrast, through the Spirit and by faith eagerly wait for the hope of righteousness; in Christ neither circumcision nor uncircumcision counts, but faith working through love.
The Galatians were running well; someone hindered them from obeying the truth, and that persuasion does not come from the one who calls them. A little leaven leavens the whole lump, but Paul trusts in the Lord that they will take no other view, and the one who is troubling them will bear the penalty. If he still preached circumcision, he would not be persecuted, and the offense of the cross would be removed.
The call to freedom is not an opportunity for the flesh but for serving one another in love, since the whole law is fulfilled in one word: you shall love your neighbor as yourself. If they bite and devour one another, they should take care that they are not consumed by one another.
Paul commands them to walk by the Spirit and not gratify the desires of the flesh, for flesh and Spirit are opposed. The works of the flesh are evident: sexual immorality, impurity, idolatry, sorcery, enmity, jealousy, fits of anger, dissensions, envy, drunkenness and the like; those who practice them will not inherit the kingdom of God. The fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness and self-control; against such things there is no law. Those who belong to Christ have crucified the flesh with its passions, and if they live by the Spirit, they also walk by the Spirit, without conceit or envy.