I mean that the heir, as long as he is a child, is no better than a slave, though he is the owner of all the estate;
but he is under guardians and trustees until the date set by the father.
So with us; when we were children, we were slaves to the elemental spirits of the universe.
But when the time had fully come, God sent forth his Son, born of woman, born under the law,
to redeem those who were under the law, so that we might receive adoption as sons.
And because you are sons, God has sent the Spirit of his Son into our hearts, crying, "Abba! Father!"
So through God you are no longer a slave but a son, and if a son then an heir.