Galatians 4:1-7 “But I say that so long as the heir is a child, he differeth nothing from a bondservant though he is lord of all; but is under guardians and stewards until the day appointed of the father. So we also, when we were children, were held in bondage under the rudiments of the world: but when the fullness of the time came, God sent forth his Son, born of a woman, born under the law, that he might redeem them that were under the law, that we might receive the adoption of sons. And because we are sons, God sent forth the Spirit of his Son into our hearts, crying, Abba, Father. So that thou art no longer a bondservant, but a son; and if a son, then an heir through God”
In verse 2 where it says, “but he is under guardians and stewards until the date appointed by his father.” Until the exact, right time when Christ came, we couldn’t get at our inheritance, but when He made His sacrifice for us and we believed, we became joint heirs with Christ.
In verse 6, “And because we are sons, God sent forth the Spirit of his Son into our hearts, crying Abba, Father.” Abba is the Aramaic word for Daddy. Paul believed that this instinctive cry of the heart of man was the work of the Holy Spirit.
And if our hearts cry out this way we know we are sons and all the inheritance of grace is ours. For Paul, the man who governed his life by slavery to the law was still a child. The man who had learned the way of grace had become a mature full-grown man in the Christian faith.