The Galatians, through the hearing of the gospel, believed in the crucified Christ, but they received the Spirit. The One who was crucified on the cross was Christ, but the One who entered into the believers was the Spirit. In His being crucified for the believers' redemption He was Christ, but in His indwelling the believers to be their life He is the Spirit. This is the all-inclusive life-giving Spirit, who is the all-inclusive and ultimate blessing of the gospel. The believers receive such a divine Spirit by the hearing of faith, not by the works of law. He enters into the believers and lives in them not by their keeping of the law but by their faith in the crucified and resurrected Christ.
In the first two chapters of this Epistle there is Christ in the divine revelation as the focal point of God's economy, but in the last four chapters there is the Spirit in our experience for us to have the divine life (ch. 3), to be born of God (ch. 4), to live and walk by the regenerated life (ch. 5), and to take the divine purpose as our goal (ch. 6). Thus, we enjoy Christ continually as the all-inclusive life-giving Spirit (v. 5a).