Now the mediator or go-between [in a transaction] is not [needed] for just one party; whereas God is only one [and was the only One giving the promise to Abraham, but the Law was a contract between two, God and Israel; its validity depended on both].

[However], I have confidence in you, since we both have a relationship with the Lord, that you will not think differently [than I do] about this matter. But whoever is causing you trouble will be rightfully judged [and punished] for it.

For both circumcision and uncircumcision mean nothing; what matters instead is a new creation.