This is Paul’s sternest letter. He writes to the churches in the region of Galatia, which question the legitimacy of his apostleship and embrace a different gospel than the one he has preached to them. He introduces himself with his official title, “apostle,” and strongly emphasizes that he owes his apostleship to Jesus Christ and God the Father, not to any man, alluding to the problem that has prompted this letter. The Christian greeting of “grace and peace” must have resonated in the assembled congregation as a serious call to repentance and unity of faith.