From a section in Communion with God when Owen is teaching on the adoption as a metaphor for salvation:
The person to be adopted must be actually, and of his own right, of another family than that into which he is to be adopted.
The person to be adopted must have no right whatever of his own to be taken into the other family.
The person to be adopted must be taken out of his natural family, and by and authoritiative, legal transaction, be put into the other family. No person has the right to adopt when and whom they would. It must be done by the authority of a sovereign power.
The person to be adopted must be free from all the obligations that held him to his own family, otherwise he cannot in any way be useful or serviceable to the family which adopts him. He cannot serve two masters, much less two fathers.
The persons to be adopted must, by virtue of his adoption, be admitted into all the rights, privileges, advantages and title to the whole inheritance of the family into which he is adopted in as a full manner as if he had been born into that family.
All these things are to be found in the adoption of believers. They are “by nature, the children of wrath” (Ephesians 2:3). They are born into the family of the world and of Satan, who is the god of this world (Colossians 1:13). Whatever is to be inherited in that family, whether wrath, curses, death or hell, they have the right to it. Neither can they, of themselves, free themselves from this family. A strong man armed keeps them in subjection. They are of the cursed family of sin and Satan.
There is another family into which they are to be adopted, and to which they have no right or title. This is that family in heaven and earth which is called after the name of Christ, the great family of God (Ephesians 3:15).
John Owen, Communion with God, p. 153-154