12 Those who want to impress people by means of the flesh are trying to compel you to be circumcised. The only reason they do this is to avoid being persecuted for the cross of Christ. 13 Not even those who are circumcised keep the law, yet they want you to be circumcised that they may boast about your circumcision in the flesh. 14 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. 15 Neither circumcision nor uncircumcision means anything; what counts is the new creation. 16 Peace and mercy to all who follow this rule—to the Israel of God. 17 From now on, let no one cause me trouble, for I bear on my body the marks of Jesus. 18 The grace of our Lord Jesus Christ be with your spirit, brothers and sisters. Amen.—Gal. 6:11-18 (NIV)
Paul is still troubled by the religious leaders trying to get the new converts circumcised. They are only trying to impress others by an outward physical manifestation of their obedience to the law. If the people know they have been circumcised then they will assume that they still adhere to the tenets of the Old Testament law. This will keep the leaders and other non-believers from persecuting them. Since they didn’t keep the other points of the law, it really wasn’t about keeping the law at all. It was just something for the flesh to boast about.
Under the new covenant of grace, circumcision has no meaning. The only thing that matters is that now we are new creations. We must die daily and be transformed by the renewing of our minds. Our outward appearance is temporary and decaying daily. Once we shed this old tent, we will be like Jesus!
2 Dear friends, now we are children of God, and what we will be has not yet been made known. But we know that when Christ appears, we shall be like him, for we shall see him as he is. 3 All who have this hope in him purify themselves, just as he is pure.—1 John 3:2,3 (NIV)