The Holy Spirit teaches us through Paul's letter to the Galatians that the law dispensationally has served its purpose for those who are now in Christ by grace through faith in His finished work alone. If we are saved, we are sons (adults, ready to receive the inheritance) of God. We have been set free from the bondage of sin and the law. God equips sons with the knowledge and wisdom God intends us to have through His completed Word via the revelation of the mystery of Christ.