What is adoption?

Adoption is an act of the free grace of God,^[1] in and for his only Son Jesus Christ,^[2] whereby all those that are justified are received into the number of his children,^[3] have his name put upon them,^[4] the Spirit of his Son given to them,^[5] are under his fatherly care and dispensations,^[6] admitted to all the liberties and privileges of the sons of God, made heirs of all the promises, and fellow heirs with Christ in glory.^[7]