One concern about early Christianity was how (if at all) it differed from the Mosaic economy. Early saints conflicted regularly over which (if any) applications of the Law remained relevant to Christians.
Paul argues in Galatians that the “works of the law” were inferior to the “faith of Christ,” as the former led to the latter (3:19-25). This proved the superiority of Christ’s system, and demonstrated that all believers – regardless of whether they had previously submitted to ordinances of the Mosaic Law — are equal heirs of God’s promise to Abraham (Gal. 3:26-29; cf. Gen. 12:1-3, et. al.).
A key word of the book is “liberty.” “Liberty” must be defined by God. It is not freedom from restraint, but freedom from the broken moral and spiritual systems found in the world. Liberty in Christ involves humble, sacrificial service (5:14-18; 6:1-4), moral excellence (5:19-26), and a promise of everlasting harvest (6:7-10)
—Rick Kelley, Prestonsburg KY church bulletin