God the Father adopteth, as the fountain of adoption; God the Son, as the conduit; God the Holy Ghost, as the cistern; faith, as the cock whereby it runs into our hearts.
                                                           T. Adams

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By it God the Father is made our Father.  The incarnate God-man is made our elder brother, and we are made—

1.  Like Him.

2.  Intimately associated with Him in community of life, standing, relations, and privileges.

3.  Joint-heirs with Him of His glory (Rom. 8:17, 29; Heb. 2:17 and Heb. 4:15).

The Holy Ghost is our indweller, teacher, guide, advocate, comforter, and sanctifier.  All believers, being subjects of the same adoption, are brethren (Eph. 3:6; 1 John 3:14; 5:11).
                                                                     A. A. Hodge

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Betwixt civil and sacred adoption there is a twofold agreement and disagreement.  They agree in this, that both flow from the pleasure and good will of the adoptant; and in this, that both confer a right to privileges which we have not by nature; but in this they differ:  one is an act imitating nature, the other transcends nature:  the one was found out for the comfort of them that had no children, the other for the comfort of them that had no Father.  Divine adoption is in Scripture either taken properly for that act or sentence of God by which we are made sons, or for the privileges with which the adopted are invested.  We lost our inheritance by the fall of Adam; we receive it by the death of Christ, which restores it again to us by a new and better title.
                                                                                                                                       J. Flavel